Creating the “Hello, World” Tool

The Java Tool project template provides the prototypical “Hello, World” application. Follow these steps to create your first Java application using Project Builder.

1. Launch Project Builder. It’s located in /Developer/Applications.

2. Create a Java tool project.

   Choose File > New Project, and select Java Tool under Java in the project-template list of the New Project pane.

   

3. Name the project and choose a location for it.

   In the New Java Tool pane of the Assistant, enter Hello in the Project Name text input field, click Choose, and choose a location for it.

   

When done, you should see the Project Builder window. Figure 3-1 shows the window with three editor panes, one for each file in the project, the Java source file, the manifest file, and the man page documentation file. The product, Hello.jar, is shown in red because it hasn’t been built.

Build and run the application by choosing Build > Build and Run. Figure 3-2 shows the Run pane of the Project Builder window. The Run pane displays the console output of the application.

Creating the Clock Tool

This section shows how to create the Clock tool. Clock is a text-based application that tells time. It takes an optional command-line argument, the name of the user. You can find the finished product among this document’s companion files in companion/projects/Clock (see Introduction to Project Builder for Java for details on companion files).

Follow these instructions to create the Clock tool.

1. Create a Java tool project and name it Clock.

2. Edit the main method of the Clock class so that it looks like this:

   public static void main (String args[]) {

   Date date = new Date();

   if (args.length > 0) {

   String user_name = args[0];

   System.out.println("Hello, " + user_name + ". It's " + date);

   }

   else {

   System.out.println("It's " + date);

   }

   }

3. Add an argument to the application’s launch arguments to test it within Project Builder.

   1. Click the Targets tab to display the Targets list.

   2. Click java under Executables in the Targets list.

   3. Click the plus sign (+) in the Arguments pane of the target editor.

   4. Enter -jar "Clock.jar" Sheilla in the newly added row of the Launch Arguments list.

   5. Deselect the Use option in the first row by clicking the checkmark in the Use column. The Arguments pane should now look like Figure 3-3.

   

Build and run the application. You should see its output in Project Builder’s Run pane, as shown in Figure 3-4.

Installing the Clock Tool

This section shows how to install the Clock tool on a computer. Follow these steps to install Clock on your computer:

1. Determine the location of the installed product by adding the INSTALL_DIR build setting to the project and configuring the setting appropriately.

   1. Click the Targets tab to display the Targets list.

   2. Click the Clock target.

   3. Click Expert View under Settings in the target editor.

   4. Click the plus sign (+) in the Build Settings pane.

   5. In the newly added row, enter INSTALL_PATH in the Name column and Tools in the Value column. The Expert View pane should look like Figure 3-5.

      

2. Run pbxbuild to install the application:

   1. Launch Terminal. It’s located in /Applications/Utilities.

   2. Execute the following commands:

      % cd <path_to_Clock_project>

      % pbxbuild install -buildstyle Deployment

Now, your /tmp directory contains the Clock distribution directory (Clock.dst), as shown in Figure 3-6.

If you want pbxbuild to install in the final destination of a product instead of in /tmp, use the following commands:

sudo pbxbuild clean

sudo pbxbuild install -buildstyle Deployment DSTROOT=/

This creates /Tools in your root volume if it doesn’t already exist and places the application’s JAR file there, as shown in Figure 3-7.

To run the application, double-click the JAR file. To view the application’s output when you launch it from the Finder, launch Console, located in /Applications/Utilities. Figure 3-8 shows Console displaying the output of a Clock session.