加上:
fr.addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{System.exit(0);}
});
fr.addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{System.exit(0);}
});
fr.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
import java.awt.event.*;class GUIApplication
{
public static void main(String args[])
{
Frame fr = new Frame("GUI Application Program");
fr.setLayout(new BorderLayout());
fr.setSize(300,300);
fr.add(new Button("OK"));
fr.add(new Button("Cancel"));
fr.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e)
{System.exit(0);}
});
fr.show();
}
}