10+

来自「本压缩文档为《Java大学实用教程》（7-121-00959-5 电子工业出版社」· 代码 · 共 44 行

import java.awt.*; 
import java.awt.event.*;
import javax.swing.*;
class MyWindow extends JFrame implements ActionListener
{ 		
    JTextField titleText;
    JPasswordField passwordText; 
    MyWindow(String s) 
    { 
      super(s);
      titleText=new JTextField(10);
      passwordText=new JPasswordField (10);
      passwordText.setEchoChar('*');
      titleText.addActionListener(this);
      passwordText.addActionListener(this);
      Container con=getContentPane();
      con.setLayout(new FlowLayout());
      con.add(titleText); 
      con.add(passwordText); 
      setBounds(100,100,150,150);
      setVisible(true);
      validate();
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
    public void actionPerformed(ActionEvent e) 
    {  
      if(e.getSource()==titleText)
       {
         this.setTitle(titleText.getText());
       }
      else if(e.getSource()==passwordText)
       {
         char c[]=passwordText.getPassword();
         titleText.setText(new String(c));
       }   
    }
}
class Example
{
    public static void main(String args[ ])
    { 
       MyWindow win=new MyWindow("窗口");
    }
}