Java by API/javax.swing/JPasswordField

JPasswordField: getPassword()

 

import java.awt.BorderLayout;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
public class Main extends JFrame {
  public static void main(String[] args) {
    Main that = new Main();
    that.setVisible(true);
  }
  public Main() {
    setSize(450, 350);
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    getContentPane().add(new PasswordPanel(), BorderLayout.SOUTH);
  }
}
class PasswordPanel extends JPanel {
  JPasswordField pwf;
  public PasswordPanel() {
    pwf = new JPasswordField(10);
    pwf.setEchoChar("#");
    add(pwf);
    pwf.addKeyListener(new KeyAdapter() {
      public void keyReleased(KeyEvent e) {
        System.out.println(new String(pwf.getPassword()));
      }
    });
  }
}

new JPasswordField()

 
import java.awt.BorderLayout;
import javax.swing.Box;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
public class MainClass {
  public static void main(String args[]) {
    JFrame f = new JFrame("JPasswordField Sample");
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Box rowOne = Box.createHorizontalBox();
    rowOne.add(new JLabel("Username"));
    rowOne.add(new JTextField());
    Box rowTwo = Box.createHorizontalBox();
    rowTwo.add(new JLabel("Password"));
    rowTwo.add(new JPasswordField());
    f.add(rowOne, BorderLayout.NORTH);
    f.add(rowTwo, BorderLayout.SOUTH);
    f.setSize(300, 200);
    f.setVisible(true);
  }
}

new JPasswordField(int columns)

 
import java.awt.Color;
import java.awt.FlowLayout;
import javax.swing.BoxLayout;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
public class Main extends JFrame {
  public Main() {
    super("JLayeredPane Demo");
    setSize(256, 256);
    JPanel content = new JPanel();
    content.setLayout(new BoxLayout(content, BoxLayout.Y_AXIS));
    content.setOpaque(false);
    JLabel label1 = new JLabel("Username:");
    label1.setForeground(Color.white);
    content.add(label1);
    JTextField field = new JTextField(15);
    content.add(field);
    JLabel label2 = new JLabel("Password:");
    label2.setForeground(Color.white);
    content.add(label2);
    JPasswordField fieldPass = new JPasswordField(15);
    content.add(fieldPass);
    setLayout(new FlowLayout());
    add(content);
    ((JPanel) getContentPane()).setOpaque(false);
    ImageIcon earth = new ImageIcon("largejexpLogo.png");
    JLabel backlabel = new JLabel(earth);
    getLayeredPane().add(backlabel, new Integer(Integer.MIN_VALUE));
    backlabel.setBounds(0, 0, earth.getIconWidth(), earth.getIconHeight());
    super.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setVisible(true);
  }
  public static void main(String[] args) {
    new Main();
  }
}

new JPasswordField(String text, int columns)

 
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JPasswordField;
public class Main extends JFrame {
  JPasswordField field = new JPasswordField("*", 10);
  public Main() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    field.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        System.out.println("Field=" + field.getText());
      }
    });
    getContentPane().add(field);
    pack();
    setVisible(true);
  }
  public static void main(String arg[]) {
    new Main();
  }
}