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Thread: Failing to properly Close Windows

  1. #1
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    Default Failing to properly Close Windows

    On my journey through my java Book, I'm starting to learn about frames.

    When you click the "X" to close the window, this program does not completely terminate for some reason, you have to use ctrl^c in the console to exit it. I do not understand why, unless this approach is deprecated. Please Help.

    WindowClosingTest.java
    // WindowClosingTest.java
     
    import javax.swing.*;
    import java.awt.*;
    import java.awt.event.*;
     
    public class WindowClosingTest extends JFrame
    {
      JTextArea frameTextArea;
      Container frameContainer;
     
      public WindowClosingTest()
      {
        super("WindowClosingTest Application");
        init();
      }
     
      public void init()
      {
        addWindowListener(new WindowCloser());
     
        frameContainer = getContentPane();
        frameTextArea = new JTextArea("\t Window Closing Test Class.", 50, 50);
     
        frameTextArea.setEditable(true);
        frameTextArea.setLineWrap(true);
     
        frameContainer.add(frameTextArea);
     
        setSize(520, 300);
        setVisible(true);
     
      }
     
      public static void main(String Args[])
      {
        new WindowClosingTest();
      }
     
    }//end class

    WindowCloser.java
    //WindowCloser.java
     
    import java.awt.event.*;
    import javax.swing.*;
     
    public class WindowCloser extends WindowAdapter
    {
      public WindowCloser(){}
     
      public void windowClosing(WindowEvent wE)
      {
        System.exit(0);
      }
    }//end class
    Last edited by Spidey1980; August 23rd, 2011 at 02:11 PM.


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    Default Re: Failing to properly Close Windows

    nevermind I got it, (WindowEvent wE) should be (WindowEvent e). Why the the book had it as "wE" and not "e" i'll never know.

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    Super Moderator copeg's Avatar
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    Default Re: Failing to properly Close Windows

    a) wE or e, it should not matter as long as when you access the variable inside the method you use the appropriate name b) Read the API for JFrame, you are better off using setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE)

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    Super Moderator Norm's Avatar
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    Default Re: Failing to properly Close Windows

    A potential problem when you extend an adapter class is that if you misspell the method you want to override, the compiler is very happy to add that method as a new one vs overriding another.
    Use the @Override statement just before your method definition to have the compiler check if your method is an override.

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