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52 lines
1.6 KiB
Java
52 lines
1.6 KiB
Java
Frame (MainFrame)
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/* This is an example of a Frame that exits the application when it is asked to close itself. Applications that want that behavior for their main frame can define a subclass of this class. */
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import java.awt.Frame;
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import java.awt.event.WindowAdapter;
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import java.awt.event.WindowEvent;
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import java.awt.event.WindowListener;
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/**
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* This is an example of a Frame that exits the application when it is
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* asked to close itself. Applications that want that behavior for their
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* main frame can define a subclass of this class.
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* <p>
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* This class requires java 1.1 or later to work.
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*/
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public class MainFrame extends Frame {
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/**
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* Constructs a new MainFrame that is initially invisible.
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*/
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public MainFrame() {
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this("");
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}
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/**
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* Constructs a new, initially invisible MainFrame with the specified
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* title.
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* @param title the title for the frame
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*/
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public MainFrame(String title) {
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super(title);
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// Subclass WindowAdapter instead of implement WindowListener so
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// that we only need to override one method instead of
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// implementing seven methods.
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WindowListener listener;
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listener = new WindowAdapter()
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{
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public void windowClosing(WindowEvent evt) {
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exit();
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} // windowClosing(WindowEvent)
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};
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addWindowListener(listener);
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} // constructor(String)
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/**
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* Override this method to verify that exiting is OK before actual
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* exit.
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*/
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protected void exit() {
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System.exit(0);
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} // exit()
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} // class MainFrame
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