对话框

//copyright?liupengcheng //http://www.VEVb.com/liupengcheng

/** * Created by Administrator on 2014/11/4. */ import javax.swing.*; import java.awt.*; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent;

class TestJDialog {     public static void main(String [] args){         JOptionPane.showMessageDialog(null,"程序开始启动");         final JFrame f = new JFrame("TestJDialog");         f.setDefaultCloSEOperation(WindowConstants.DO_NOTHING_ON_CLOSE);

        f.addWindowListener(new WindowAdapter() {             @Override             public void windowClosing(WindowEvent e) {                 int retval = JOptionPane.showConfirmDialog(f,"你真的要结束吗？"                         ,"结束程序",JOptionPane.YES_NO_OPTION);                 if (retval == JOptionPane.YES_OPTION)                     System.exit(0);             }         });         f.setSize(200,200);         f.setVisible(true);     } }