testjframe2.java

来自「Java the UML Way 书中所有源码」· Java 代码 · 共 31 行

/*
 * TestJFrame2.java   E.L. 2001-08-22
 */
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

class JFrame2 extends JFrame {
  public JFrame2() { 
    Container guiContainer = getContentPane();
    guiContainer.setLayout(new FlowLayout());
    guiContainer.add(new JLabel("This window handles closing. Close the window!"));
    addWindowListener(new MyWindowListener());
  }

  private class MyWindowListener extends WindowAdapter {
    public void windowClosing(WindowEvent event) {
      System.out.println("Here we may write to data files, etc.");
      System.exit(0); // Remember this!
    }
  }
}

class TestJFrame2 { 
  public static void main(String[] args) {
    JFrame mySecondWindow = new JFrame2();
    mySecondWindow.setTitle("My Second Window");
    mySecondWindow.setSize(400, 100);
    mySecondWindow.setVisible(true);    
  }
}