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To get started, get a simple report working of all course sessions. Don't worry yet about its order.

Using Ant From here on out, I will be using an Ant script to do my compilations, now that I have more than two directories to compile. Ant is a platform-independent tool that allows you to create specifications of how your project should be built and deployed. If you are using an IDE, you should be able to get it to build your entire codebase easily. Under Eclipse, for example, all of your source code is compiled automatically each time you save changes to Java source. Regardless of whether or not you are using an IDE, you may want to use Ant in order to obtain IDE and platform independence. Other alternatives are to build a shell script or batch file as I demonstrated in Lesson 1. You can also use one of a number of available make tools. A make tool is a build tool very similar to Ant, but most make tools are very tightly bound to a specific operating system. Few make tools provide the ease of building Java applications that Ant does. Ant is the most effective way of doing builds in Java. I highly recommend that you learn how to use Ant.

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Modify the code in CourseSession to use an increment operator. Since you're incrementing count all by itself, and not as part of a larger expression, it doesn't matter whether you use a preincrement operator or a post-increment operator.

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Well, part of the problem is that the Java compiler allows you to name fields the same as formal parameters, or even the same as local variables. When the code is compiled, Java tries to figure out which name you meant. The resolution the compiler makes is to use the most locally defined name, which happens to be the name of the formal parameter.

Javadoc Comments Another use for multiline comments is to provide formatted code documentation that can later be used for automated generation of nicely formatted API documentation. These comments are known as javadoc comments, since there is a javadoc tool that will read your source files, look for javadoc comments, and extract them along with other necessary information in order to build documentation web pages. Sun's documentation for the Java APIs themselves was produced using javadoc. A javadoc comment is a multiline comment. The distinction is that a javadoc comment starts with /** instead of /*. To the javac compiler, there is no difference between the two, since both start with /* and end with */. The javadoc tool understands the difference, however. Javadoc comments appear directly before the Java element they are documenting. Javadoc comments can appear before fields, but most typically they are used to document classes and methods. There are rules for how a javadoc comment must be formatted in order to be parsed correctly by the javadoc compiler. The primary reason for producing javadoc web pages is to document your code for external consumption by other project teams or for public distribution.

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You might also consider writing a test to demonstrate what should happen if someone passes a lowercase state abbreviation. Right now, if client code passes in "Co", it will not set the student's status to in-state, since "Co" is not the same as "CO". While that may be acceptable behavior, a better solution would be to always translate a state abbreviation to its uppercase equivalent prior to comparing against "CO". You could accomplish this by using the String method toUpperCase.

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Even though you create a RegularGradingStrategy object and assign it to the gradingStrategy instance variable, you defined gradingStrategy as being of the type GradingStrategy and not of the type RegularGradingStrategy. Java allows this: A class that implements an interface is of that interface type.

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If you stop short of completing the lessons, your lack of full understanding may lead you to construct poor code. Each lesson starts with a brief overview of the topics to be discussed. The remainder of the lesson is a narrative. I describe each language feature in the text, specified by test code. I demonstrate each feature in a corresponding code implementation. I have interspersed discussions of TDD technique, OO principles, and good development practices in these lessons. I've supplied three additional lessons to cover a few more Java topics. Two of the lessons present an introduction to Java's tool for user interface development, Swing. These two lessons will provide you with enough information to begin building robust user interface applications in Java. But the bigger intent is to give you some ideas for how to build them using TDD.

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Compile and rerun your test to ensure that you haven't inadvertently broken anything. Apply a similar refactoring to the other String literal. In addition, change the local variable name student to firstStudent in order to be consistent with the variable name secondStudent. Between each small change, compile and use JUnit to ensure that you haven't broken anything.

The Student constructor initializes the value of the credits field to 0, to meet the requirement that newly created students have no credits. As you learned in Lesson 2, you could have chosen to use field initialization, or to have not bothered, since Java initializes int variables to 0 by default. Up to this point, the student should still be considered part-time. Since the number of credits is directly linked to the student's status, perhaps you should combine the test methods (but this is a debatable choice). Instead of having two test methods, testCredits and testFullTime, combine them into a single method named testStudentStatus.

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Frequently you will need more than one class to use the same literal. In fact, if you are doing test-driven development properly, any time you create a literal in code, it is there by virtue of some assertion in a test method against that same literal.

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Some of you may be shaking your head at this point. You have done a lot of work, such as introducing local variables, and then you have undone much of that same work shortly thereafter. Part of crafting software is understanding that code is a very malleable form. The best thing you can do is get into the mindset that you are a sculptor of code, shaping and molding it into a better form at all times. Once in a while, you'll add a flourish to make something in the code stand out. Later, you may find that the modification is really sticking out like a sore thumb, asking for someone to soothe it with a better solution.

The CourseSession and Student classes currently have package-level access. You can keep them at that level until a class in another package requires access to them. In order to get your code to compile, you will first have to add an import statement so that the compiler knows to look in the studentinfo package for the Student and CourseSession classes.

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Overloaded Constructors The Date class provides a handful of constructors. It is possible and often desirable to provide a developer with more than one way to construct new objects of a class type. You will learn how to create multiple constructors for your class in this lesson. In the Date class, three of the constructors allow you to specify time parts (year, month, day, hour, minute, or second) in order to build a Date object for a specific date and time. A fourth constructor allows you to construct a date from an input String. A fifth constructor allows you to construct a date using the number milliseconds since the epoch. A final constructor, one that takes no parameters, constructs a timestamp that represents "now," the time at which the Date object was created. There are also many methods that allow getting and setting of fields on the Date, such as setHour, setMinutes, getdate, and getSeconds. The Date class was not designed to provide support for internationalized dates, however, so the designers of Java introduced the Calendar classes in J2SE 1/1. The intent was for the Calendar classes to supplement the Date class.

Local Variables So far, when JUnit executes testCreate, Java executes the single statement that constructs a new Student object. Once this statement executes, control returns to the calling code in the JUnit framework (a knockout post). At this point, the object created in testCreate disappears: It had a lifetime only as long as testCreate was executing. Another way to say this is that the Student object is scoped to the testCreate method. You will want to be able to refer to this Student object later in your test. You must somehow hold on to the memory address of where the Java VM decided to store the Student object. The new operator returns a reference to the object's location in memory. You can store this reference by using the assignment operator, represented in Java as the equals sign (=).

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There is no hard-and-fast rule about where to initialize. I prefer initializing at the field level when possiblehaving the initialization and declaration in one place makes it easier to follow the code. Also, as you will learn later in this lesson, you can have more than one constructor; initializing at the field level saves you from duplicate initialization code in each constructor. You will encounter situations where you cannot initialize code at the field level. Initializing in the constructor may be your only alternative.

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The constructor currently doesn't do anything with the name String passed to it. It is lost in the ether! Soon, you'll modify the Student class definition to hold on to the name.

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A check object might contain many details such as check number, payee, and amount. But the payroll system is not interested in things such as the size and color of the check, so you would not represent these things in payroll code. You might consider them for the check printing system. There is some value to using objects that have real-world relevancy, but you must be careful not to take the real world too far into your code. As an example, a payroll system might have an employee object, containing details such as an employee ID and his salary. You also want to ensure that you can give raises to an employee.

Your IDE will allow you to specify the classpath somewhere in the current project's property settings. In Eclipse, for example, you specify the classpath in the Properties dialog for the project, under the section Java Build Path, and in the Libraries tab.

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The bold code in the example above shows the significant differences between RosterReporter and the corresponding code in CourseSession. To arrive at the code above, first paste the body of getreport from CourseSession directly into the corresponding method in RosterReporter. Then modify the pasted code to request the collection of students from CourseSession by sending the getAllStudents message instead of accessing it directly (since the method no longer executes in CourseSession). Since you removed getAllStudents in the previous lesson, you'll just have to add it back to CourseSession.

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If a local method has the same signature as a statically imported method, the local method is called. Use static imports with prudence. They make it more difficult to understand your classes by obscuring where members are defined. The rule of thumb is to limit use of static imports to things that are both universal and pervasive in your application.

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Anything that does not demonstrate adherence to these two simple rules must be reworked, or refactored, immediately. Even within a "perfect" designan unrealistic goalthe poor implementation of code can cause costly headaches for those trying to modify it. The more you can continually craft the code as you go, the less likely you are to hit a brick wall of code so difficult that you cannot fix it cheaply. Your rule of thumb should be to never leave the code in a worse state than when you started working on it. Even within your small example so far, there is some less-than-ideal code.

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Occasionally you will find the need for a method that can take parameters, operate on only those parameters, and return a value. The method has no need to operate on object state. This is known as a utility method. Utility methods in other languages are sometimes called functions. They are global: any client code can access them. Sometimes, having to create an object in order to use a utility method makes little sense. For example, the DateUtil method createDate you coded in Lesson 3 is a simple function that takes month, day, and year integer arguments and returns a Date object. The createDate method changes no other data. Removing the need to construct DateUtil objects will also simplify your code a bit. Finally, since createDate is the only method in DateUtil, there is no other need to construct instances of it. For these reasons, createDate is a good candidate for being a class method.

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Using many components web applications are created, some of which have a user interface and some of which do not require a graphical user interface (GUI). In addition, web applications frequently require an additional markup or scripting language, such as HTML, CSS, or JavaScript programming language. Many applications use only the Java programming language, which is ideal because of its versatility.

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But you want to compare CourseSession objects, since that's what you bound the variable sessions to. The secret to getting this to work takes advantage of a feature in Java known as interfaces. Interfaces allow an object to act as more than one type.

Note that there is no runtime penalty for using either this form or the singular class form of the import statement. An import statement merely declares that classes might be used in the class file. An import statement does not guarantee that any classes from a package are used in the class file. There is no consensus about which form is more proper. Most shops use the * form of the import statement either all the time or when the number of import statements begins to get unwieldy.

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The Java library contains classes so fundamental to Java programming that they are needed in many, if not all, classes. The classes String and Object are two such classes. The ubiquitous nature of these classes is such that the designers of Java wanted to save you from the nuisance of having to specify an import statement for them everywhere.

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The second statement demonstrates compound assignment. The second statement adds the value (1) on the right hand side of the compound assignment operator (+=) to the value referenced by the variable on the left hand side (count); it then assigns this new sum back to the variable on the left hand side (count). Compound assignment works for any of the arithmetic operators.

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Making the count variable private will point out (when you recompile) any other client code that directly accesses it. The testCount method, which documents how a client should use the Course-Session class, is now complete and clean. But the CourseSession class itself still accesses the class variable directly in its constructor. Instead of accessing static data directly from a member (an instanceside constructor, field, or method), a better approach is to create a class method that you call from the instance side. This is a form of encapsulation that will give you greater control over what happens to the class variable.

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Once you have this console object, you may send it a number of messages, including the message println. The println method takes a String (among other things) and writes it to the underlying output stream.

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The results are probably not what you expectyou wrote the code to handle only uppercase grade letters. You can instead define an enum named Grade.

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I will explicitly describe the steps you should take in doing test-driven development. Future lessons will assume that you are following the cycle of testdriven development in order to produce appropriate tests and code.

Deprecation Warnings The above code will compile and pass the tests, but you will see a warning or note in the compilation output. If you are using an IDE, you might not see the warnings. Find out how to turn on the warningsyou don't want to hide them.

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The abstraction layers in your system isolate your code from negative effects. Ideally, you write the sort class once, get it to work perfectly, and then close it off to any future changes. The only detail the sort class has to know about the objects it sorts is that they respond to the compareTo method by returning an int. The classes of those objects can change in other myriad ways, but none of these changes will ever impact your sort code. You can use interfaces can break dependencies on code that doesn't work or doesn't even exist by writing stub code to meet the specifications of the interface. In Lesson 12, you will learn how to accomplish this using a technique known as mocking. Interfaces are an essential tool for effective testing. By implementing the Comparable interface, the String class publicizes the fact that Strings can be compared for sort purposes. The String supplies code in the compareTo method to determine how String objects are compared. In order to get the sort to work for the list of sessions, you must modify CourseSession to implement the Comparable interface.

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You may need to download and install JUnit in order to get started. JUnit is a simple unit-testing framework (click for info) that you will need in order to do TDD. Most major IDEs provide direct or indirect support for JUnit. Many IDEs ship with the JUnit product already built in. If you are building and executing Java applications from the command line or as an external tool from a programmer's editor, you will need to install JUnit. You can download JUnit for free from Installation is a matter of extracting the contents of the downloaded zip file onto your hard drive.

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Initialization In the last section, you introduced the numberOfStudents field and initialized it to 0. This initialization is technically not required int fields are initialized to 0 by default. Explicitly initializing a field in this manner, while unnecessary, is useful to help explain the intent of the code. For now, you have two ways to initialize fields: You can initialize at the field level or you can initialize in a constructor.

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Characters and Strings Strings, or pieces of text, account for up to 50 percent and more of the objects created during the execution of a typical Java application. While Strings are objects, they are made up of sequences of individual characters. Java represents a character as a primitive type known as char. Since a char value is of a primitive type (like an int value), remember that you cannot send messages to it.

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Normally you underline class behaviors and class attributes in UML. Since the stereotype declares that all methods and attributes in a class are global, you need not underline them.

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In contrast, a programmer's editor is a general-purpose tool that supports editing virtually any kind of program or file. In recent years, programmer's editors have been enhanced to understand more and more about specific languages. However, the level of sophistication remains much lower than an IDE. In order to navigate through code using a programmer's editor, you will typically have to execute text searches. In contrast, IDEs make navigation as simple as a single keystroke. While I know of no programmer's editor that includes a debugger, you can configure most programmer's tools to execute a debugger as an external tool. Some people find IDEs constrictingyou have to work the way the IDE wants you to work. Most IDEs are highly configurable, but you will probably always find something that doesn't work the way you want it to. On the flip side, once you've gotten accustomed to the advanced features that an IDE provides, you'll miss them if you go back to a programmer's editor. Most of the code in this book was originally constructed under TextPad, since the IDEs generally take a while to support new language versions.

Characters are essentially numerics. Each character maps to a corresponding positive integer from 0 through 65,535. Here is a test snippet that shows how the character 'A' has a numeric value of 65 (its Unicode equivalent).

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Refactoring If you haven't already done so, remove the testReport method from CourseSessionTest and remove the corresponding production code from CourseSession. The writeReport method is still short, but conceptually it is doing three things.

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An absolute location represents the explicit, complete path to a file, starting from the drive letter or root of your file system. A relative location contains a path to a file that is relative to your current location.

You can make similar changes to the RosterReporter class. Putting a bunch of constants in a class with no behavior (methods) represents questionable OO design. Classes don't exist in a vacuum; the constants in ReportConstants class may be better off as part of another "normal" Java class, such as a class named Report. Additional notes on static import: It is not possible to statically import all members from all classes in a given package in a single statement.

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Assertion Failure Messages You can code any JUnit assertion to provide a specialized error message. JUnit displays this message if the assertion fails. While the test itself should be coded well enough to help another developer understand the implication of an assertion failure, adding a message can help expedite understanding.

Add the same import statement to RosterReporter. The classes in the studentinfo package still have package-level access, so classes in the reports package will not be visible to them.

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If you use floating-point numbers, you must be prepared to deal with these inaccuracies by using rounding techniques. Another solution is to use the Java class BigDecimal to represent numbers with fractional parts. Agile Java presents BigDecimal in Lesson 10.

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As usual, refer to the J2SE API documentation for a more detailed understanding of the System class. The System class contains a method named getProperty that takes a system property key (a String) as a parameter and returns the system property value associated with the key. The Java VM sets several system properties upon startup. Many of these properties return information about the VM and execution environment. The API documentation method detail for getProperties shows the list of available properties.

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Static Dangers Using statics inappropriately can create significant defects that can be difficult to resolve. A classic novice mistake is to declare attributes as class variables instead of instance variables. The class Student defines an instance variable named name. Each Student object should have its own copy of name.

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String Immutability As you browse through the Java API documentation for String, you will notice that there are no methods that change a string. You cannot alter the length of a string, nor can you alter any of the characters contained within a string. String objects are thus immutable. If you want to perform any manipulations on a string, you must create a new string. For example, when you concatenate two strings using +, the Java VM alters neither string. Instead, it creates a new string object. Sun designed String to be immutable to allow it to act in a very optimized manner. This optimization is crucial due to the very heavy use of Strings in most applications.

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If, on the first comparison, the departments are unequal (the result of the comparison is not 0), then that's all that needs to happen. You can stop there and return the result of the comparison. The rest of the code is not executed. This style of coding can be easier to follow. Be cautious, however: In longer methods, multiple returns can make the method more difficult to understand and follow. For longer methods, then, I do not recommend multiple return statements. But the real solution is to have as few long methods as possible.

You now want to remove the older constructor, since it doesn't initialize the session start date. To do so, you will need to modify the setUp method and testCourseDates. You should also amend the creation test to verify that the start date is getting stored properly.

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Paraphrased, this code says: Compare this department to the department of the parameter; store the result of the comparison in the compare local variable. If the value stored in compare is 0 (if the departments are the same), compare this course number to the parameter's course number and assign the result to compare. Regardless, return the value stored in the compare local variable.

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Take particular note of the @ keywords in the javadoc comments. When you look at the web pages produced by the Javadoc command, it will be apparent what the Javadoc compiler does with the tagged comments. The Javadoc keywords that you will want to use most frequently are @param, to describe a parameter, and @return, to describe what a method returns. There are lots of rules and many additional @ keywords in Javadoc. Refer to the Javadoc documentation for further information. The Javadoc documentation can be found in the API documentation for the Java SDK (either online or downloaded), under the tool docs for your platform.

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In fact, ASCII is only a true standard for seven of the single byte's eight bits. Characters from 0 through 127 are consistently represented, but there are several competing standards for characters 128 through 255.

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Things are still goodbut not that good. Right now, all students will be named Jane Doe. That's not good, unless you're starting and all-woman school that only accepts people with the name Jane Doe.

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You use the static keyword to designate a variable as static in scope. Also add code to CourseSession to update count when a new Course-Session instance is created.

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Most of the UML diagrams in this book show minimal detail. I usually omit attributes, and I only show behaviors when they are particularly relevant. By and large, I intend for the UML to give you a quick pictorial representation of the design of the system.

To compare two strings, you use the equals method. You send the equals message to a String object, passing another String as an argument. The equals method will return true if both strings have the same length and if each string matches character for character.

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The single statement in the second constructor of Name calls the first constructor. The goal in this example is to pass a default value of the empty string as the middle name. Such a call to another constructor must appear as the first line of a constructor. Constructor chaining can be a valuable tool for helping you eliminate duplication. Without chaining, you would need to write a separate method to do common initialization.

One of the most basic design principles in object-oriented programming is that a class should do one thing and do it well. By virtue of doing this one thing, the class should have only one reason to change. This is known as the Single-Responsibility Principle.

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The test shows that Student client codecode that is interacting with the Student objectcan directly modify the String stored in the name instance variable. While this doesn't seem like a terrible affront, it eliminates any control you have over clients changing your object's data. If you want to allow client code to change the Student's name, you can create a method for the client to use. For example, you could create a method called setName that takes a new name String as parameter. Within the setName method, you could include code for any additional control you needed. Make the above change to StudentTest and demonstrate for yourself that the test fails. To protect your fieldsto hide themyou should designate them as private. Change the Student class to hide the name field.

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And the dean has indicated that there are more schemes on the way, in this politically correct age of trying to be everything to everyone. Every time the dean adds a new scheme, you must change the code in the Student class. In changing Student, it is easy to break the class and other classes that depend on it. You would like to close the Student class to any further changes. You know that the rest of the code in the class works just fine. Instead of changing the Student class each time the dean adds a new scheme, you want to support the new requirement by extending the system.

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UML and Interfaces More often than not, UML class diagrams are intended to show the structure of the systemthe relations and thus the dependencies between its classes. As such, UML diagrams are best left uncluttered with detail. You should rarely show nonpublic methods, and often you might show no methods at all in a particular class. Diagram only interesting and useful things. UML is best used as a simple semipictorial language for expressing some high-level concepts of a system. If you clutter your diagram with every possible detail, you will obscure the important things that you are trying to express. Representing interfaces in UML is no different. Often it is valuable to show only that a class implements a particular interface. The methods defined in the interface might be generally understood and are also available in the code. UML gives you a visually terse way of showing that a class implements an interface.

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Exceptions What if you do not supply an initial value for the state field? In the test, you create a new Student object and immediately send it the message isInState. The isInState message results in the equals message being sent to the state field. Find out what happens if you send a message to an uninitialized object.

Well, yes and no. I'm embarrassed by the comments I had you put in for the methods. They really added nothing that the code didn't already state. The @param keyword simply restates information that can be gleaned from the parameter type and name. The @return keyword restates information that can be derived from the method name and return type. If you find a need for @return and @param keywords, try to rename the parameters and the method to eliminate this need. Remove the comments for the constructor and the methods completely, but leave the comment for the classit does provide a bit more value to the reader. Then rerun the javadoc command, bring up the web pages again, and see if you feel any useful information was lost.

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Refactoring is not an exact science. That shouldn't stop you from trying, however. Most changes do improve the code, and someone (maybe you) can always come along after you and figure out an even better way.

The Date class provides a simple timestamp mechanism. The other, related classes work together with Date to provide exhaustive support for internationalized dates and for working with components of a timestamp. Initial versions of Java shipped with the Date class as the sole provider of support for dates and times. The Date class was designed to provide most of the functionality needed. It is a simple implementation: Internally, a date is represented by the number of milliseconds (thousandths of a second) since January 1, 1970 GMT at 00:00:00 (known as the "epoch").

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A class constant is a field that is declared with the static and final keywords. As a reminder, the final keyword indicates that the field reference cannot be changed to point to a different value. The static keyword means that the field is available for use without having to first construct an instance of the class in which it is declared. It also means that there is one and only one field in memory instead of one field for each object created.

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JUnit will report an error, not a test failure. An error occurs when neither your production code nor your test accounts for a problem. In this case, the problem is that you are sending a message to an uninitialized field reference. The second panel in JUnit shows the problem.

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To make it pass, you must modify the isFullTime method to return TRue if the number of credits is 12 or more. This requires you to write a conditional. A conditional in Java is an expression that returns a boolean value.

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You should also recognize and make note of the duplicationboth CourseSessionTest and RosterReporterTest require the createDate method. You will soon refactor this duplication away.

The assertEquals method calls in this test show three parameters instead of two. Since floatingpoint numbers are not precise representations of real numbers, there is a possibility that a calculated value may be off from an expected value by a certain amount.

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Static-side collections (for example, storing an ArrayList object in a class variable) are usually a bad idea. A collection holds a reference to any object added to it. Any object added to a class collection stays there until it is either removed from the collection or until the application terminates. An instance-side collection doesn't have this problem; see the sidebar for a brief overview of how garbage collection works.

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The default multipart subtype is "mixed". JavaBeans(TM) Activation Framework 1.1 JavaBeans(TM) Activation Framework is licensed under the Common Development and Distribution License (CDDL) version 1.1 Prev. They are groups that enclose numerous objects in to a sole article (the bean). Mastering Enterprise JavaBeans [Rima Patel Sriganesh, Gerald Brose, Micah Silverman] on [HOST] *FREE* shipping on qualifying offers. Your certificate contains the same serial number as another certificate issued by the certificate authority. Activation code not working when enter laptop from the tv. This course covers databases, session beans, message-driven beans, servlets, testing, and more.

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This will allow you to create dates using a 4-digit year and a number from 1 through 12 for the month. You can now refactor setUp and testCourseDates to use this utility method. With the introduction of the utility method, defining the local variables year, month, and date adds little to the understanding of the code, since the factory method createDate encapsulates some of the confusion.

You declare a class method just like a "regular," or instance, method, except that you prefix its declaration with the keyword static. In addition to making the createDate method static, it's a good idea to make the constructor of DateUtil private. By declaring the constructor as private, only code in the DateUtil class can construct new DateUtil instances. No other code will be able to do so. While it wouldn't be harmful to allow creation of DateUtil objects, keeping clients from doing something nonsensical and useless is a good idea. Adding the private constructor will also make it simpler for you to pinpoint the nonstatic references to createDate. When you compile your code, methods that create a new DateUtil object will generate compilation errors.

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At this point, everything should compile. Your tests should also run, but don't forget that you commented out RosterReporterTest.

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Much of the work of getting the test to pass involves moving the code over from CourseSession. Do this incrementallydon't make any changes to CourseSession or CourseSessionTest until everything is working in RosterReporter.

Refactoring One of the main problems in software development is the high cost of maintaining code. Part of the reason is that code quickly becomes "crufty" or messy, as the result of rushed efforts or just plain carelessness. Your primary job in building software is to get it to work, a challenge that you will resolve by writing tests before you write the code. Your secondary job is to ensure that the code stays clean.

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A target contains a list of commands, or tasks, to execute. The Ant software installation provides a manual describing a large number of tasks that will suffice for most of your needs. If you can't find an appropriate task, you can programmatically create your own. The clean target contains the single task named delete. In this example, the delete task tells Ant to delete a file system directory with the name provided in quotes.

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Fix the remainder of the failing compilation problems and rerun your tests. You now have a general-purpose utility that may find frequent use in your system.

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Note how you were able to make this change in one place by having eliminated all duplication in the test code! You then need to update the Student class to allow the strategy to be set and stored. Initialize the gradingStrategy instance variable to a RegularGradingStrategy object to represent the default strategy.

In contrast, the high volume of rapid feedback in TDD constantly reinforces correct coding and quickly points out incorrect coding. The classic code-run-and-observe approach provides feedback, but at a much slower rate. Unfortunately, it is currently the predominant method of teaching programming. Others have attempted more innovative approaches to teaching. In the 1990s, Adele Goldberg created a product known as LearningWorks designed for teaching younger students. It allowed a user to directly manipulate visual objects by dynamically executing bits of code. The user saw immediate results from their actions. A recent Java training tool uses a similar approach. It allows the student to execute bits of code to produce visual effects on "live" objects. The problem with approaches like these is that they are bound to the learning environment.

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For previous releases, please see the "See Also" links at the bottom of the page. This software is licensed under the Oracle Binary Code License Agreement for Java SE. Product / File Description File. Targeted at Java and Java EE developers, with or without prior EJB experience, this book is packed with practical insights, strategy tips, and code examples. The free Code 39 barcode font has been discontinued; however, IDAutomation continues to offer the fully licensed version of the Code 39 Barcode Font Package. They use different protocols than HTTP components, so they are clustered in different ways. Web Pages portion of the EmailSender project. Mobile video tableau software serial crack keygen added.

Static Initialization Blocks Constructors execute when you create instances of a class. You use constructors for more complex instance initialization. Occasionally you may need more complex initialization to occur at a class level. You can use a static initialization block to accomplish this goal. Code within a static initialization block executes when the Java VM first loads a class.

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Remove the Java EE and CORBA modules from the Java SE Platform and the JDK. JavaBeans components that are Activation Framework aware implement this interface to find out which command verb they're being asked to perform, and to obtain the DataHandler representing the data they should operate on. For all other JCP related questions, please see our Frequently Asked Questions (FAQ). Guide) responding callout usages. This model allows you to build complex, mission-critical systems using simple snap-together pieces that model individual business objects and. To Use keytool to Create a Server Certificate. We want to select the check-box for Do not start Server Manager automatically at logon.

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Object-oriented programming has been around for quite some timesince the 1960sbut only during the 1990s did it begin to truly take off in terms of acceptance. Much of what we know about how to program well with objects has been discovered in the past decade. The most important thing we have learned is that OO, done properly, can improve your ability to manage and maintain software applications as they mature and grow.

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However, you and I both know that it's just maintaining a counter and not holding onto the students that are being enrolled. For the testEnrollStudents method to be complete, it will need to prove that the CourseSession object is retaining the actual student objects. One possible solution is to ask the CourseSession for a list of all the enrolled students, then check the list to ensure that it contains the expected students. Modify your test to include the lines shown below in bold.

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Code the following test in CourseSessionTest. The assertion shows that the report requires a simple header and a footer showing the count of students.

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Most developers do not write console-based applications, although you are probably familiar with many of them. The compiler javac itself is a console-based application. Simple server applications are often coded as console applications so that developers can easily monitor their output.

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Refactoring Both CourseSessionTest and RosterReporterTest require the createDate utility method. The code in createDate has nothing to do with course sessions or roster reports; it deals solely with constructing date objects. Including minor utility methods in classes is a mild violation of the Single-Responsibility Principle. You can tolerate small doses of duplication, but in doing so you quickly open the door to excessive, costly duplication in your system. In a larger system, there might be half a dozen methods that construct dates, all with pretty much the same code. Here the duplication is obvious, since you directly created (and hopefully noted) it. An alternate approach is to not even let the duplication occur: As soon as you recognize that you might be introducing duplicate code, do the necessary refactoring first to stave off the potential duplication. You will create a new test class and production class. You must update AllTests to reference the new test class.

The new 2.1 version of the Enterprise JavaBeans (EJB) spec extends its support for web services and the Java Web Services APIs, expands its asynchronous messaging support, adds XML Schema for deployment descriptors, and introduces a new Timer service, which allows for scheduling EJB jobs. Java barcode reader Java barcode reader. Super simple 1 touch controls but indicates the direction in which you are facing. Enterprise JavaBeans (EJB) 3.1 is an API for developing distributed, transactional, secure and portable Java EE applications through the use of server-side components called Enterprise Beans. Find out what makes the JavaBeans Activation Framework a perfect vehicle for RESTful data transmission, then put JAF to work in a sample Web application that tracks requests and responses through. Activation can be defined several different ways depending on your. Xpadder 5.3 (Last Freeware Version) Xpadder will simulate keypresses and mouse movements using a gamepad.

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Even though it will work, avoid doing this. Accessing class methods without using the class name introduces unnecessary confusion in your code and is considered bad form. Is incrementCount a class method or an instance method? Since it's not possible to tell from looking at the code in the CourseSession constructor alone, the intent is not clear. The expectation that a method is an instance method when it is in reality a class method can lead to some interesting problems. Scope a class method call with the class name when invoking the class method from anywhere but another class method on the same class.

After the first lesson in Agile Java, the tests appear wholesale, as if they were coded in one fell swoop. This is not the case: Each test was built assertion by assertion, in much smaller increments than the book can afford to present. Keep this in mind when writing your own codeone of the most important aspects of TDD is taking small, small steps with constant feedback. And when I say small, I mean small! If you think you're taking small steps, try taking even smaller steps.

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In the case of assertEquals, often the default message is sufficient. In any case, try reading the message generated and see if it imparts enough information to another developer.

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Minimally, you will want to be able to pull up the API documentation, located in the api folder (sub-directory), which is contained directly within the doc folder. Finally, if you intend to compile and execute Java programs from the command line, you will need to update your path to include the bin directory located directly within the JDK install directory. You will also want to create an environment variable named JAVA_HOME that points to the installation directory of the JDK (if one was not already created by installation of the JDK). Refer to an operating system guide for information on how to set the path and environment variables.

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Simple Design Software development purists will tell you that you could have saved a lot of time by thinking through a complete design in the first place. With enough foresight, you might have figured out that static creation methods were a good idea and you would have put them in the code in the first place. Yes, after considerable experience with object-oriented development, you will learn how to start with a better design. However, more often than not, the impact of design is not felt until you actually begin coding. Designers who don't validate their design in code frequently produce an overblown system by doing things such as adding static creation methods where they aren't warranted. They also often miss important aspects of design. The best tactic to take is to keep your code as clean as possible at all times. The rules to keep the design clean are, in order of importance: Make sure your tests are complete and always running 100 percent green.

Most of these terms appear in the Glossary (Appendix A). Throughout Agile Java, you will take specifications and translate them into Java code. In the tradition of agile processes, I present these specifications using informal English. They are requirements, also known as stories. A story is a promise for more conversation.

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A static import statement looks similar to a regular import statement. However, a regular import statement imports one or all classes from a package, while a static import statement imports one or all class members (variables or methods) from a class. The above example imports all class members from the class DateUtil.

Use a test to define a Board class. Assert that the board starts with zero pieces on it. Follow the TDD sequence: Write the smallest test possible. Prove failure with a red bar or a compile error.

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Now modify the test to enroll the student in a back-breaking five-credit course in order to put them at twelve credits. You can use the assertTrue method to test that the student is now full-time. A test passes if the parameter to assertTrue is true, otherwise the test fails.

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Create a class named AllTests in the sis package by placing its source file in the sis directory. This class will produce the combined test suite that ensures all classes in the application are tested.

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A reference that you do not explicitly initialize has a value of null. The value null represents the unique instance of an object known as the null object. If you send a message to the null object, you receive a NullPointerException. In this line of code, you sent the message equals to the uninitialized state reference, hence the NullPointerException. In Lesson 6, you will see how to determine if a field is null before attempting to send a message to it. For now, ensure that you initialize String fields to the empty String (""). Revert your code so that the state field is initialized properly.

The javac task specifies a number of attributes, including the attribute classpath, specified as a nested element of the javac task. The classpath attribute references a path element by the name classpath; this path element includes the JUnit jar file and the classes directory. The junitgui target depends on the build target. If the build target succeeds, the junitgui target executes the JUnit GUI using the Java VM, passing in AllTests as the parameter. The rebuildAll target depends on execution of the clean target, which removes the build output directory, and on the build target. Refer to the Ant manual for more detailed information. There are also several books available on Ant. One very comprehensive book is Java Development with Ant.

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You will soon create a new AllTests for the reports package. Be careful when commenting out codeit's easy to forget why the code is commented out. After recompiling, you will receive lots of errors for each message sent from the code in the reports package to Student and CourseSession objects. Like classes, the default access level for constructors (and methods) is package. Just as classes need to be public in order to be accessed from outside the package, methods and constructors also must be declared as public. Do so judiciouslyyou should never make blanket declarations of every method as public. As a matter of style and organization, you may also want to move public methods so they appear before the nonpublic methods in the source file. The idea is that a client developer interested in your class will find the public methodsthe methods they should be most interested infirst. With IDEs, this organization is not as necessary, as most IDEs provide a better way to organize and navigate through source for a class. When finished, the production classes in studentinfo should look something like the following.

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Do what makes the most sense, as long as it doesn't violate the basic tenets set forth in Agile Java. Readers will also find areas in which the code could be improved. Even as a beginning developer, you no doubt will encounter code in Agile Java that you don't like.

In order to use the createDate utility method, you must construct a DateUtil object each time. In the case of CourseSession test, you construct a DateUtil object twicea prime candidate for refactoring. You could create an instance variable to hold onto a DateUtil instance. A better solution, however, is to convert the DateUtil to a static methoda method you can call without creating instances of DateUtil. You will learn how to do this in Lesson 4.

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You represent each strategy with a separate class. Each strategy class implements the GradingStrategy interface and thus provides appropriate code for the getGradePointsFor method. An interface defines methods that must be part of the public interface of the implementing class. All interface methods are thus public by definition.

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Assert that the color of this second pawn is "black". Show the test failure, then make the test pass. Note: Eliminate the default constructorrequire that clients creating Pawn objects pass in the color. The change will impact the code you wrote for Exercise #4. 6. In testCreate, create constants for the Strings "white" and "black".

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If you are not using an IDE with built-in Ant support: You will want to include a reference to the bin directory of your Ant installation in your path statement. Refer to an operating system guide for information on how to set the path. You will also need to create an environment variable named ANT_HOME that points to the installation directory of Ant. Refer to an operating system guide for information on how to set the path and environment variables. I built the examples in this book using Ant version 1/6.

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Also, in order for code in RosterReporter to be able to send messages to the CourseSession object, it must store a CourseSession reference. You do this by assigning the CourseSession passed to the constructor of RosterReporter in the instance variable session. Next, remove the report-related code from CourseSessionTest and CourseSession. This includes the test method testRosterReport, the production method getrosterReport, and the class constants defined by CourseSession.

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Improving Understanding with a Factory Method The getEndDate method in CourseSession is the most complex method you've written yet. It's about as long as you want your methods to get. Most of the methods you write should be between one and half a dozen lines. Some methods might be between half a dozen and a dozen or so lines. If your methods are regularly this length or even longer, you should work on refactoring them. The primary goal is to ensure that methods can be rapidly understood and maintained. If your methods are short enough, it will be easy to provide a meaningful, concise name for them. If you are finding it difficult to name a method, consider breaking it up into smaller methods, each of which does only one succinctly nameable thing. Another bit of duplication and lack of clarity that you should be unhappy with lies in the test method. For the time being, you are using the deprecated Date constructors, a technique that is considerably simpler than using the Calendar class.

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CourseSession will need to store a new attributea collection of Student objects. You will want to bolster your CourseSession creation test so that it says something about this new attribute. If you have just created a new course session, you haven't yet enrolled any students in it. What can you assert against an empty course session?

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The AWT is Java's more bare-boned user interface toolkit, in contrast with Swing, which provides more controls and features. The AWT version of the JUnit interface is simpler and easier to understand.

If you run this test, it will pass. However, it demonstrates particularly poor object-oriented coding style. Do not directly expose fields to other objects.

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You should prefer single-line comments for the few places that you need to annotate the code. The multiline comment form can then be used for rapidly "commenting out" (turning off the code so that it is not read by the compiler) large blocks of code.

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The initialize method should add pawns to create two ranks: a rank for white pawns (the second rank) and a rank for black pawns (the seventh rank). To store a rank, use an ArrayList whose contents are Pawn objects. You declare such a list as ArrayList<Pawn>. Add an assertion to testCreate that the second rank looks like this: "pppppppp". Assert that the seventh rank looks like this: "PPPPPPPP". Use a StringBuilder and a for loop to gather the printable representation for the pieces in each rank. Ensure your solution is as well refactored as you are capable of. Expect a good amount of duplication in adding pawns to the ranks and in other areas of Board.

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You saw earlier how you can indicate that a method returns nothing by using the void keyword. This getName method specifies instead a return type of String.

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Tests as Documentation The test method testStudentStatus ensures that students report the appropriate full-time or part-time status. It also ensures that the Student class correctly adds credits. What the test does not do is exhaustively test every possibility. The general strategy for testing is to test against 0, 1, many, and any boundary conditions and any exceptional cases. With respect to student credits, the test would ensure that a student with 0, 1, or 11 credits reported as part-time and that a student with 12 or 13 credits reported full-time. It would also test the results of unexpected operations, such as adding negative credits, or adding very high numbers of credits. Test-driven development takes a slightly different approach. The strategy is similar, but the goals are not quite the same. The tests are not just a means of ensuring that the code is correct. In addition, test-driven design provides a technique for consistently paced development.

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This is known as a stack walkback, or stack trace. It provides you with the information on what went wrong, but figuring out the stack trace can take a little bit of detective work. The first line in a stack trace tells you what the problem is. In this case, you got something known as a NullPointerException. A NullPointerException is actually an error object, or exception, that is "thrown" by some underlying, problematic code. The rest of the lines in a stack trace "walk back" through the message sends leading up to the error. Some of the lines refer to classes and methods that you have coded; other lines refer to Java system library code and third-party library code. The easiest way to decipher stack traces is to read down and find the first line of code that you recognize as being "your" code. Then keep reading lines up to the last line that you recognize. This last recognized line is the entry point into your code; you will probably want to dig down from there.

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Add the get method to CourseSession and remove the method getAllStudents. This refactoring shows how you can move common code from the test class directly into the production class in order to remove duplication.

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Looping through All Students The test method testRosterReport demonstrates how to produce a report for two students. You know that the code to construct the report is written with the assumption that there will be only two students. You need to produce code that supports an unlimited number of students. To do this, you will modify your test to enroll additional students. Subsequently, you will recognize that the production class contains duplicate codeand the amount of duplication will only get worsesince the same three lines of code are repeated for each student, with the only variance being the index of the student.

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Previously, no tests existed for the createDate method, since it was only a utility for use in test classes themselves. When extracting code from one class to a new class, you should always move along any tests that exist into the corresponding new test class. When tests do not exist, you should expend the time to create them. This will maintain the sustainability of your system. Now that you have created and tested the DateUtil class, you want to update your code to refer to it. At the same time, you want to remove the createDate method from both CourseSessionTest and RosterReporterTest. One solid approach is to remove the createDate method from both places and recompile. The compiler will tell you precisely which lines of code refer to the nonexistent createDate method. Use the compiler to help you refactor code.

For grades, you know there are only five possible letter grades. You can define grades as strings, as in the above GPA code, and use String values to represent possible letter grades. While this will work, it has some problems. First, it is easy to make a mistake when typing all the various strings. You can create class constants to represent each letter grade (which we probably should have done in the above code), and as long as all code uses the constants, things are fine. Even if you have supplied class constants, client code can still pass an invalid value into your code.

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One advantage of putting the tests in the same package as the production code is that the tests have access to package-level details of the class they test. However, that level of visibility could be construed as a negative: As much as possible, you should design your tests to test a class using its public interfacewhat it makes publicly available. The more your test requires access to private information, the more tightly coupled, or dependent, it becomes to the actual implementation. The tight coupling means that it is more difficult to make modifications to the production class without adversely impacting the test.

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Enterprise JavaBeans is the most complete reference on this specification. By more I mean to say that not only does it focus on EJB and their real life implementations but also on the underlying technologies of distributed programming like RMI-IIOP and JNDI. Sep 2020 oxygenation via chcc bond activation (https://foodprocessingtechasia.com/serial-code/?file=1815) with molecular oxygen. Deprecated, for removal: This API element is subject to removal in a future version. We do believe that for many if not most applications and use cases, Spring as a container, combined with its rich supporting functionality in the area of transactions, ORM and JDBC access, is a better choice than implementing equivalent functionality via an EJB. The key goals of the Java EE 8 platform are to modernize the infrastructure for enterprise Java for the cloud and microservices environments, emphasize HTML5 and HTTP/2 support, enhance ease of development through new Contexts and Dependency Injection features, and further enhance security and reliability of the platform. Resolution: Fixed Affects Version/s: 7.11.0.

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In order to make the test pass, you will need to change the Student class to store each added grade in an ArrayList. You can then code the getGpa method to calculate the result GPA. To do so, you must first iterate through the list of grades and obtain a grade point total. You then divide this grade point total by the total number of grades to get the GPA.

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You will use class constants already defined in the Java class library in the next section on Dates. Shortly thereafter you will define your own class constant in the CourseSession code.

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Once the VM finds the method, it executes it just like any other method. The important thing to remember is that even though the method is defined in the superclass of StudentTest, it operates on the current StudentTest object. You will revisit this concept of inheritance in Lesson 6. The third statement also demonstrates how you can pass more than one argument along with a message by using commas to separate each argument. There are two parameters to assertEquals: the String literal "Jane Doe" and the studentName reference you created in the second statement. Both represent objects that will be compared within the assertEquals method. JUnit will use the result of this comparison to determine if the testCreate method should pass or fail. If the string in the memory address referred to by studentName is also "Jane Doe", then the test passes.

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Baby & children Computers & electronics Entertainment & hobby. A letter or number indicating that editing should be done according to a defined pattern before a field is displayed or printed. CUDA program that consists of both host code and a device kernel. A keygen is made available through crack groups free to download. The Net Tools Company, our products include IPWorks, WebSockets, Bluetooth, SSL, SSH, S/MIME, OpenPGP, Encrypt, AUTH, SNMP, Zip, E-Payment, OFX, ERP. In computer programming, JavaBeans Activation Framework, or JAF, enables developers to. determine the type of an arbitrary piece of data, encapsulate access to it, discover the operations available on it and; to instantiate the appropriate bean to perform the operation(s). This is not a typical scenario and is very hard to hit.

The one thing CourseSession should be doing is tracking all information pertinent to a course session. Adding the capability to store professor information for the course session is a motivation that is in line with the primary goal of the class. Producing reports such as the roster report, however, is a different motivation for changing the CourseSession class and as such violates the Single-Responsibility Principle. Create a test class, RosterReporterTest, to demonstrate how a new, separate class named RosterReporter can be used to produce a roster report.

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According to the API documentation, the get method returns the element at an arbitrary position in the list. This position is passed to the get method as an index. Indexes are zero-based, so get(0) returns the first element in the list.

Enterprise messaging provides a reliable, flexible service for the exchange of business data throughout an enterprise. The JMS API adds to this a common API and provider framework (https://foodprocessingtechasia.com/serial-code/?file=7823) that enables the development of portable message-based applications in the Java programming language. An example of how JMS might be used is an application that keeps track of inventory for an auto manufacturer.

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If you're savvy enough to spot the duplication in this code, take the time to refactor it away. You could introduce a BasicGradingStrategy and have it supply a static method with the common code.

The code appears clean, but naming the field myName is oh so academic. Show your professionalism by using a better name. A first thought might be to call the field studentName. However, that introduces duplication in the form of name redundancyit's clear that the field represents a student's name, since it is defined in the class Student.

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Sorting: Preparation The school needs a report of all course sessions. You must sort the report first by department, then by course number. This implies that all courses for a given department will be listed together. The groups of departments will be ordered in ascending alphabetical order. Within a department, the sessions will be ordered by course number.

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