J2SE密码输入框

import javax.swing.*;
import java.awt.event.*;
class TestP extends JPanel
{
private JTextField text;
private JPasswordField pass;
public TestP()
{
JLabel jl=new JLabel("密码");
text=new JTextField(10);
pass=new JPasswordField(10);
pass.setEchoChar('*');
pass.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
text.setText(pass.getText());
}
});
add(jl);
add(pass);
add(text);
}
}