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that constructs the GUI for your Swing application, or whenever you need to modify the state of the GUI from code not executed by the event-dispatching thread You will normally want to use invokeLater( ), as the following example does However, when constructing the initial GUI for an applet, you will want to use invokeAndWait( ) (See Create a Swing-Based Applet Skeleton in 6)
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Historical Note: getContentPane( )
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Prior to Java 5, when adding a component to, removing a component from, or setting the layout manager for the content pane of a top-level container, such as a JFrame, you had to explicitly obtain a reference to the content pane by calling getContentPane( ) For example, assuming a JLabel called jlab and a JFrame called jfrm, in the past, you had to use the following statement to add jlab to jfrm:
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jfrmgetContentPane()add(jlab); // old-style
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Beginning with Java 5, the call to getContentPane( ) is no longer necessary because calls to add( ), remove( ), and setLayout( ) on a JFrame are automatically directed to the content pane For this reason the recipes in this book do not call getContentPane( ) However, if you want to write code that can be compiled by older versions of Java, then you will need to add calls to getContentPane( ) where appropriate
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The following program shows one way to write a Swing application In the process it demonstrates several key features of Swing It uses two Swing components: JFrame and JLabel JFrame is the top-level container that is commonly used for Swing applications JLabel is the Swing component that creates a label, which is a component that displays information The label is Swing s simplest component because it is passive That is, a label does not respond to user input It just displays output The program uses a JFrame container to hold an instance of JLabel The label displays a short text message
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// A simple Swing program import javaxswing*; import javaawt*; class SwingDemo { SwingDemo() { // Create a new JFrame container JFrame jfrm = new JFrame("A Simple Swing Application"); // Give the frame an initial size jfrmsetSize(275, 100); // Terminate the program when the user closes the application jfrmsetDefaultCloseOperation(JFrameEXIT_ON_CLOSE);
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// Create a text-based label JLabel jlab = new JLabel(" This is a text label"); // Add the label to the content pane jfrmadd(jlab); // Display the frame jfrmsetVisible(true); } public static void main(String args[]) { // Create the frame on the event dispatching thread SwingUtilitiesinvokeLater(new Runnable() { public void run() { new SwingDemo(); } }); } }
Swing programs are compiled and run in the same way as other Java applications Thus, to compile this program, you can use this command line:
javac SwingDemojava
To run the program, use this command line:
java SwingDemo
When the program is run, it will produce the window shown here:
Pay special attention to these lines of code within main( ):
SwingUtilitiesinvokeLater(new Runnable() { public void run() { new SwingDemo(); } });
As explained, all interaction with Swing s visual components, including the initial construction of the GUI, must take place on the event-dispatching thread Here, the invokeLater( ) method is used to instantiate a SwingDemo instance on the eventdispatching thread
8:
Swing
Options and Alternatives
The example uses the default layout manager for the content pane of a JFrame, which is BorderLayout It implements a layout style that defines five locations to which a component can be added The first is the center The other four are the sides (ie, borders), which are called north, south, east, and west By default, when you add a component to the content pane, you are adding the component to the center To specify one of the other locations, use this form of add( ): void add(Component comp, Object loc) Here, comp is the component to add and loc specifies the location to which it is added The loc value must be one of the following:
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