example5_14.java

书中的例题

/* 显示确认对话框 */
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class MDialog extends JFrame implements ActionListener
{
  MDialog()
  {
   super("显示确认信息对话框");
   setSize(200,200);
   setVisible(true);
   Container con=getContentPane();
   con.setLayout(new FlowLayout());
   JButton jbtn=new JButton("退出");
   con.add(jbtn);
   jbtn.addActionListener(this);
   validate();
  }
  public void actionPerformed(ActionEvent e)
   {
     String msg="你确定退出吗？";
	 int type=JOptionPane.YES_NO_OPTION;
	 String tite="确认对话框";
	 int choice=0;
	 choice=JOptionPane.showConfirmDialog(null,msg,tite,type);
	 if (choice==0)
	 { System.exit(0);  }
	 else 
		 System.out.println(choice);
    }
}
//主类
public class Example5_14 
{
	public static void main(String[] args) 
	{	new MDialog();}
}