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Figure 2-2. Eclipse Welcome view
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Once you close the Welcome view, you ll be presented with the Workbench showing the default Java perspective as shown in Figure 2-3. The Workbench is the top-level component of Eclipse; it is the main window and shows one perspective at a time. A perspective is a window divided into several sections used for viewing and editing a resource in your workspace. The Eclipse Java perspective is where we will spend most of your time as a Java developer. Eclipse provides several built-in perspectives tailored for Java development, debugging, version control with CVS, resource management and plug-in development among others. Based on certain operations (like running a Java class in debug mode) Eclipse will automatically switch perspectives for you. You can also switch perspectives by selecting Window Open Perspective and selecting a perspective. As you can see from Figure 2-3, a perspective is composed of one or more views and an editor pane. In Figure 2-3 we have the Package Explorer view on the left side, which gives you a Java Package-centric view of your projects; to the right we have the empty editor pane, and on the far right there s the Outline view. On the lower half of the right side, the Problems view is displayed.
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The views in an Eclipse perspective reflect the needs of a related set of tasks. In the case of the Java perspective, the task is to create, test, and execute Java classes. Central to any perspective is the editor or editors associated with it.
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Figure 2-3. Java perspective
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Let s start by creating a simple Eclipse Java project. Select File New Project, which will bring up the New Project wizard as shown in Figure 2-4. The default selection is Java Project . Click Next, which starts the New Java Project wizard. The wizard s initial dialog provides an input field for the project name, and the rest of the dialog is divided into three sections to configure the new project s contents, JDK compliance level, and directory structure. As it is shown in Figure 2-5, the name of the sample project is helloworld-j2se .
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Figure 2-4. Creating a new project
Figure 2-5. New Java Project details
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In the Contents section, select Create new project in workspace , which will create a directory for the project in the Eclipse workspace directory you selected during the installation. As mentioned before, we will be using JDK 1.5; therefore in the JDK Compliance section select Use a project specific compliance and select 5.0 from the pop-up menu. Finally, in the Project layout section, it is a good practice to separate the Java source files from the compiled class files by selecting Create separate source and output folders . Clicking Next will bring up the Java Settings tabbed dialog as shown in Figure 2-6.
Figure 2-6. Java Settings dialog The four tabs in this dialog allow you to customize several build-path settings, including Source: In this tab you can specify which resources in a source folder will be available to the compiler via inclusion and exclusion filters. Projects: In Eclipse you can create project dependencies by making the classes in another project available to the current project. See the Order and Export item below to determine what is visible to other projects linked to a project.
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Libraries: In this tab you can make items available to a project s classpath by adding JAR files relative to the project directory or external JARs located in the file system. Internal Eclipse JARs are also available as well as predefined libraries which can contain one or more JARs grouped under a library name like JRE System Library. Another way to add JARs to a project is indirectly as a classpath variable. Order and Export: In this tab you can determine the order in which elements are made available to the project s classpath. Entries checked are exported, which means that they will become available to any other projects that list the current project as a dependency. To complete the project setup click Finish, closing the dialog. The Package Explorer view should look like that shown in Figure 2-7.
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