import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.event.*; public class JButton8_2 { JFrame f; JButton b1,b2; public static void main(String argv[]) { new JButton8_2(); } public JButton8_2() { JFrame.setDefaultLookAndFeelDecorated(true); JDialog.setDefaultLookAndFeelDecorated(true); f=new JFrame("JButton8_2"); f.setSize(300,200); f.setLocationRelativeTo(null); f.setVisible(true); Container cp=f.getContentPane(); cp.setLayout(new GridLayout(2,3)); b1=new JButton("按鈕 1"); b2=new JButton("按鈕 2"); cp.add(b1); cp.add(b2); f.setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE); f.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { int result=JOptionPane.showConfirmDialog(f, "確定要結束程式嗎?", "確認訊息", JOptionPane.YES_NO_OPTION, JOptionPane.WARNING_MESSAGE); if (result==JOptionPane.YES_OPTION) {System.exit(0);} } }); } }