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Figure 1.14 Templates When you created the new HelloWorld class, text similar to the following was generated at the top of the new compilation unit: /* * Created on 27.04.2004 * * To change this generated comment go to * Window - Preferences - Java - Code Style - Code Templates */ /** * @author Berthold Daum * * To change this generated comment go to * Window - Preferences - Java - Code Style - Code Templates */ The first comment was generated for the new Java file, and the second comment was created for the new type (HelloWorld). You now should follow the advice given in these comments and modify the code generation preferences according to your requirements. Just open the preferences category Java > Code Style > Code Templates (see Figure 1.15). 16 Chapter 1
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and remove garbage from your code. Just try the following: set Parameter Is Never Read to Warning and press OK. The project is recompiled. At the program line public static void main(String[] args) { you now see a warning icon, and in the Problems window you see the entry The argument args is never read Quite right! The HelloWorld program did not make use of the parameter that contains the commandline arguments. Classfiles and JDK Compliance On the Compliance & Classfiles page you can specify which symbolic information, such as variable names and line numbers, is to be included in the generated classfiles. This information is required for debugging, and therefore you may want to leave the proposed settings unchanged. However, for a welltested program it may make sense to remove this information from the classfiles; generated files are much smaller without the symbol tables. On the same page you can determine whether the compiler must comply with the Java 1.4 or Java 1.3 syntax. With Java 1.4, one new instruction was added to the language: assert. Consequently, the word assert can no longer be used as a field or method name. In addition, assert requires support from the JVM. Classes that use this instruction cannot be executed by older JVMs. Since assert is not used in the first example program, leave this setting at the proposed value of Java 1.3. Formatting Code Formatting code can be very helpful, because it is easier to detect violations of the control structures of a program (such as open if or while statements) when the program is formatted. In the preference category Java > Code Style > Code Formatter you can configure how the Eclipse code formatter works, as shown in Figure 1.14. The best method is to try some of the settings and to select those that work best for your application. To modify these settings you must first create a new profile (by pressing the New button). Then you can edit this profile by pressing the Edit button. You can create multiple profiles and switch easily among them. When you publish your code, for example, you may use different profiles for different sorts of publications. But how do you apply code formatting? Very simply: just click with the right mouse button on the source code and select Source > Format from the context menu (Figure 1.14). The key shortcut Ctrl+Shift+F works even faster. Note that it is also possible to select only a portion of the source code to format just that portion. 15 Introduction to Eclipse
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Compiler Preferences Now take a closer look at the compiler preferences. In the Preferences dialog select the category Java and the subcategory Compiler. Note that all adjustments made here affect the whole workbench. On project level (see the Project Properties section in Chapter 4), however, you have the possibility of overriding the global settings made here under Preferences. Warnings and Errors On the right-hand side of the Java > Compiler category you see a tabbed notebook. The Style, Advanced, Unused Code, and Javadoc pages show which compiler events create errors or warnings and which compiler events should be ignored (see Figure 1.13). 14 Chapter 1 Figure 1.13 Because a lot of third-party code is used in the examples, you need to reset the settings for unused imports, never-read local variables, and never-read parameters on the Unused Code page to Ignore. Otherwise, you could face an overwhelming flood of error messages. But if you develop your own applications, it makes sense to set these settings to Warning because these settings help you to detect
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13 Introduction to Eclipse Figure 1.12 A new JRE is added to the Eclipse workbench. I have provided the name and location of the JRE home directory. The location of the corresponding Javadoc is preset by Eclipse and points to the JavaSoft Web site. If the documentation is available locally, you should modify this entry accordingly. The entry Default VM Arguments may specify VM command-line parameters to be used with this VM. For further customization you could uncheck the Use Default System Libraries item. This would allow you to add further JAR libraries. If any of the JARs does not contain source code, you can attach external source code by pressing Attach Source. If you want to add a version 1.1 JRE (this is necessary when you want to run your application on a Microsoft VM), you must also change the JRE type to the value Standard 1.1.x VM. Of course, it is possible to execute an application on a JVM that is different from the JVM under which the application was developed. For example, if you developed an application under Java SDK 1.1.8 and want to test how the application performs under a version 1.3.1 JVM, you must change the runtime environment before executing the program. You can do this by choosing the appropriate JVM in the Eclipse Launch Configurator. You can open the Launch Configurator by invoking the menu function Run > Run. For the remainder of this book I use the Java 1.4 SDK.
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be added to the sequence. Use the Backspace key to delete entries. To add a new key sequence, don t select an entry in the Assignments list; simply enter the key sequences in the described way, and then press the Add button. On the Advanced page of the Key Bindings preferences you can enable an assistant that will help you with completing multistroke keyboard shortcuts. Installed JREs You probably don t always want to create Java applications that require a Java 1.3 or Java 1.4 platform. In some cases you may need to run on Java 1.2 platforms. Within the preference category Java, in the subcategory Installed JREs, you can list all Java Runtime Environments that are installed on the host computer (see Figure 1.11). 12 Chapter 1 Figure 1.11 In this preference category you can declare all the Java Runtime Environments (SDK or JRE) that are installed on the host computer for Eclipse. Among the JREs listed here, Checkmark One is the default JRE. This JRE will be assigned to all new Java projects. You will learn later how this can be changed in the project settings and how different JREs can be used in different Launch Configurations. To add a new JRE, just click the Add button (alternatively you can click the Search button to scan a whole directory for a JRE or SDK). Then complete the following dialog (see Figure 1.12).
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Figure 1.10 At first sight, the sheer mass of preferences shown in this dialog may be overwhelming, because each plug-in may contribute its own set of preference categories to this dialog. In this chapter, I will discuss only those preferences that are most relevant in the context of this book. You should take the time to step systematically through all preference categories to get an overview of the possibilities. Some of the categories have subcategories. To expand a category, click the + sign in front of the category name. Some of the preference settings will make sense only during the discussion of the corresponding Eclipse function. In such cases I will postpone the discussion of the preference settings to the discussion of the corresponding workbench function. Workbench Preferences If you previously have worked with Emacs, it may make sense to switch the Key Bindings in Eclipse so you can continue to use the familiar Emacs shortcuts. To do so, expand the Workbench category, select the subcategory Keys, and click the Keyboard Shortcuts tag. In the drop-down list named Active Configuration you can choose between Emacs and Default. You can even define your own keyboard shortcuts. First, go to the Command group and select a command via the Category and Name fields. The existing keyboard shortcut assignments appear in the Assignments list. A keyboard shortcut can consist of a single key combination or a series of key combinations. Edit the sequence of key combinations by placing the cursor into the Name field of the Key Sequence group and pressing the key combination to 11 Introduction to Eclipse
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Figure 1.8 By doing this you have finished the programming work for your first project. Save the new class HelloWorld to disk by clicking the floppy disk icon on the toolbar. (Alternatively, you can use the keyboard shortcut Ctrl+S.) This will also compile this class. The program is now ready for execution. Launch The Run icon is positioned on the right side of the bug icon. Here, you activate the drop-down menu by clicking the arrow at the right of the Run icon. From this drop-down menu select Run As > Java Application to start program execution. Now, a new tag with the label Console should appear in the Tasks View area. With a click on that tag you can open the Console View (see Figure 1.9), which should display the text Hello World. Done! During this first execution, Eclipse creates a new Run Configuration named HelloWorld. A list of all available Run Configurations is found under the arrow on the right side of the Run icon. The Run icon itself is always associated with the Run Configuration that was executed last. To execute the program again, simply click the Run icon. The console window opens automatically when a program writes to System.out or System.err. 9 Introduction to Eclipse
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Figure 1.7 After you click the Finish button, the Eclipse workbench looks a bit more like a workbench in use (Figure 1.8). The Package Explorer shows the contents of the new project, including the libraries of the Java runtime environment. At any time you can open the classes belonging to these libraries and look at their source code. The center window holds the Java source editor, which currently contains the pregenerated code for the HelloWorld class. At the right-hand side you can see the Outline window showing the current class with its methods. You quickly navigate to any method or variable in the source editor by clicking it in the Outline View. Now you complete the pregenerated code. You change the main() method in the following way: public static void main(String[] args) { System.out.println(”Hello World”); } 8 Chapter 1
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The Java perspective shows the windows (Package Explorer, Hierarchy), menu items, and toolbar icons that are typical for Java development. On the left you see a new icon denoting the Java perspective. Above this icon is the icon for the Resource perspective that was active before you opened the Java perspective. You can quickly switch between different perspectives by clicking these icons. Projects Now it s time to say Hello to the world and to create your first program. To do so, first create a new Java project. On the toolbar click the Create a Java Project icon, as shown in Figure 1.6. By clicking the icons of this group you can create new Java projects, packages, classes, interfaces, and JUnit Test Cases. 7 Introduction to Eclipse Figure 1.6 In the dialog that appears, name the project with HelloWorld. The Package Explorer now shows an entry for the new project. Create a New Class In the next step click the C icon on the toolbar (Create a Java Class). In the following dialog make sure that . The Source Folder is specified as HelloWorld. . The name of the new class is specified as HelloWorld. . public is selected as Modifier. . java.lang.Object is specified as Superclass. . The option to public static void main() is checked. The Create a New Class Wizard (Figure 1.7) is able to generate some class code. The wizard can generate stubs for the inherited methods, especially if a super class and interfaces are specified.
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Figure 1.4 Use the Open Perspective icon to open new perspectives. By the way, by clicking the perspective bar with the right mouse button and invoking the function Dock On, you can change the position of the perspective bar. If you were used to Eclipse 2.1, you may want to dock the perspective bar at the left border of the Eclipse workbench. From the list that appears, select Java. You should then see the screen shown in Figure 1.5. 6 Chapter 1 Figure 1.5
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