Question

java中提供密码输入的方法是什么？

就是有个对话框，输入的时候显示的是星号。谢谢

Answer 1

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

class C {
public static void main( String[] args ) {
JFrame f = new JFrame( );
f.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
f.setSize( 300, 140 );
f.setLocation( 250, 250 );

Container c = f.getContentPane( );
c.setLayout( new FlowLayout( ) );

// JPasswordField
c.add( new JLabel( "Enter your password into this JPasswordField: " ) );
JPasswordField jpf = new JPasswordField( 10 );
jpf.addActionListener(
new ActionListener( ) {
public void actionPerformed( ActionEvent e ) {
Object pwd =
new String( ( ( JPasswordField ) e.getSource( ) ).getPassword( ) );
JOptionPane.showMessageDialog( null, "Your password is " + pwd );
}
}
);
c.add( jpf );

// TextField
c.add( new JLabel( "Or enter your password into this TextField: " ) );
TextField tf = new TextField( 12 );
tf.setEchoChar( '*' );
tf.addActionListener(
new ActionListener( ) {
public void actionPerformed( ActionEvent e ) {
Object pwd = ( ( ( TextField ) e.getSource( ) ).getText( ) );
JOptionPane.showMessageDialog( null, "Your password is " + pwd );
}
}
);
c.add( tf );

f.setVisible( true );
}
}

Answer 2

javax.swing下有个PasswordField类`这个就是提供密码筐的用法和TextFiled一样`文本是TextField 密码筐就是PasswordField简单好记`

Answer 3

<input type="password" name="psd">