The following instructions are for users of Windows Vista, Windows 7, and Windows 8. Instructions for other platforms are in.
You can easily adapt these instructions if you use a different text editor. These two items are all you'll need to write your first application. Creating Your First Application. Your first application, Hello. World. App, will simply display the greeting . To create this program, you will: Create a source file. A source file contains code, written in the Java programming language, that you and other programmers can understand.
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You can use any text editor to create and edit source files. Compile the source file into a . The Java programming language compiler (javac) takes your source file and translates its text into instructions that the Java virtual machine can understand. The instructions contained within this file are known as bytecodes. Run the program. The Java application launcher tool (java) uses the Java virtual machine to run your application. Create a Source File. To create a source file, you have two options: First, start your editor.
You can launch the Notepad editor from the Start menu by selecting Programs > Accessories > Notepad. In a new document, type in the following code. The Hello. World. App class implements an application that. Both the compiler (javac) and launcher (java) are case- sensitive, so you must capitalize consistently. Hello. World. App is not the same as helloworldapp. To do this in Notepad, first choose the File > Save As menu item.
Then, in the Save As dialog box: Using the Save in combo box, specify the folder (directory) where you'll save your file. In this example, the directory is myapplication on the C drive. In the File name text field, type . You can do this from the Start menu by choosing Run.. The shell window should look similar to. A shell window. The prompt shows your current directory.
When you bring up the prompt, your current directory is usually your home directory for Windows XP (as shown in the preceding figure. To compile your source file, change your current directory to the directory where your file is located. For example, if your source directory is myapplication on the C drive, type the following command at the prompt and press Enter: Now the prompt should change to C: \myapplication>. Note: To change to a directory on a different drive, you must type an extra command: the name of the drive. For example, to change to the myapplication directory on the D drive, you must enter D: , as follows: C: \> D. D: \> cd myapplication. D: \myapplication> If you enter dir at the prompt, you should see your source file, as follows: C: \> cd myapplication.
C: \myapplication> dir. Volume in drive C is System. Volume Serial Number is F2. E8- C8. CC. Directory of C: \myapplication. PM < DIR> .
At the prompt, type the following command and press Enter. The compiler has generated a bytecode file, Hello.
The first time that you create a JUnit test the IDE prompts you to select a version and then adds a Test Libraries node and the. Creating a Test Class for Utils.java. You will now create the JUnit test methods for Utils. It is created for Beginners in Java. This is to test the knowledge of any Java Developer wannabe. Java Quiz For Beginners. Writing an algorithm before writing your program and having a test plan.
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World. App. class. At the prompt, type dir to see the new file that was generated as follows: C: \myapplication> javac Hello. World. App. java. C: \myapplication> dir. Volume in drive C is System. Volume Serial Number is F2. E8- C8. CC. Directory of C: \myapplication.
PM < DIR> . Run the Program. In the same directory, enter the following command at the prompt: You should see the following on your screen: C: \myapplication> java - cp . Hello. World. App. Hello World! Your program works! If you encounter problems with the instructions in this step, consult the. Common Problems (and Their Solutions).
Writing JUnit Tests in Net. Beans IDEThis tutorial introduces the basics of writing and running JUnit unit tests in Net. Beans IDE. Type JUnit- Sample for the project and set the project location. Deselect the Use Dedicated Folder option, if selected. Click OK. Specify the Local Folder for the sources.
If you did not install the JUnit plugin when you installed the IDE. Net. Beans project you will be prompted to install the JUnit plugin to resolve the reference to the JUnit libraries. Creating the Java Classes. In this exercise you copy the files Utils. Vectors. java from the sample project. JUnit. Sample. Sol into the class library project that you created.
In the Projects window, right- click the Source Packages node of the JUnit- Sample project and. New > Java Package from the popup menu. Type sample as the package name. Click Finish. Open the JUnit. Sample. Sol project (if not already open) and expand the Source Packages node in the Projects window. Copy the classes Utils.
Vectors. java in the JUnit. Sample. Sol project.
JUnit- Sample. You can close the JUnit. Sample. Sol project because you will not need it again. Creating a Test Class for Vectors. In this exercise you create a JUnit test skeleton for Vectors. If you are using Net. Beans IDE 7. 1 or earlier you do.
JUnit is specified by default. Click OK. Select JUnit 3. Select JUnit Version dialog box. When you select JUnit 3. IDE adds the JUnit 3 library to the project.
When you click Select, the IDE creates the Vectors. JUnit. 3Test. java test class. Test Packages node in the Projects window. A project requires a directory for test packages to create tests. In JUnit 4 it is no longer necessary to use this test method naming syntax because you can use. Test. Case. Writing Test Methods for Vectors.
In this exercise you modify the generated test methods to make them functioning tests. If you look at the output you can see the order that the tests were run. It took longer than 1.
The next step after you create your unit test classes is to create test suites. You will use the IDE's wizards to create test skeletons based on the classes in your project. If you already selected JUnit 3.
JUnit 4. x. If you are using Net. Beans IDE 7. 1 or earlier you do. JUnit is specified by default. Click OK. Select JUnit 4. Select JUnit Version dialog box. Click Select. When you click OK, the IDE creates the Vectors.
JUnit. 4Test. java test class. Test Packages node in the Projects window. Note. A project requires a directory for test packages to create tests. For JUnit 4 tests, notice that by default the IDE adds a static. Assert.*. Writing Test Methods for Vectors.
In this exercise you modify each of the generated test methods. JUnit assert method and to change the names of the test methods. When writing tests it is not necessary to change the printed output.
You can still write and run JUnit 3 tests if you select JUnit 4 as the version. IDE uses the JUnit 4 template for generating test skeletons. Right- click Utils.
Tools > Create Tests. Select JUnit in the Framework dropdown list if not selected. Select Test Initializer and Test Finalizer in the dialog box if not selected. Modify the name of the test class to Utils. JUnit. 4Test in the Create Tests dialog box. You do not need the initializer and finalizer methods to test Utils.
In JUnit 4 you can use annotations to mark the following types of initializer and finalizer methods. Test Class Initializer. The @Before. Class annotation marks a method as a test class initialization method. You could then close the connection with the test class finalizer. Test Class Finalizer. The @After. Class annotation marks a method as a test class finalizer method.
The @Before annotation marks a method as a test initialization method. The @After annotation marks a method as a test finalizer method. If you look at the output you can see the order that the tests were run. Click Next. Type JUnit. Test. Suite for the Class Name.
Select the sample package to create the test suite in the sample folder in the test packages folder. Deselect Test Initializer and Test Finalizer. To run JUnit 3 test suites as part of a JUnit 4 test suite requires JUnit 4.
Right- click the project node in the Projects window and choose New > Other to open the New File wizard. Select Test Suite in the Unit Tests category. Click Next. Type JUnit. Test. Suite for the file name. Select the sample package to create the test suite in the sample folder in the test packages folder. Deselect Test Initializer and Test Finalizer.
The test suite contains code similar to the following.@Run. With(Suite. class). Suite. Suite. Classes(value=. Expand the Test Packages node in the Projects window.
Right- click the test suite class and choose Test File. When you run the test suite the IDE runs the tests included in the suite in the order they are listed.