按键退出applet or frame

exit  =   new  javax.swing.JButton();
 

 
exit.addActionListener( new  java.awt.event.ActionListener()  {
      public void actionPerformed(java.awt.event.ActionEvent evt) {
             exitActionPerformed(evt);
        }
} );
 

 
private   void  exitActionPerformed(java.awt.event.ActionEvent evt)  {
        try {  
                 System.exit(0);
     } catch (Exception e){
            input.setText("Error: " + e.toString());
        }
    }

对于frame除了这个方法外 还可以用dispose()

btnClose.addActionListener( 
         
                         new  ActionListener() 
                        {
                               // pass query to tthe frame
                             public void actionPerformed( ActionEvent event )
                             {
                 
                                 dispose();
                 
                             } // end actionPerformed
                         }    //  end ActionListener inner class          
                      );  //  end call to addActionListener