JPasswordField – Java Swing – Example

In this tutorial, we are going to see an example of JPasswordField in Java Swing. JPasswordField is part of javax.swing package. JPasswordField class is a specialized text component for password entry. It allows the edition of a single line of text. JPasswordField inherits from the JTextField class in javax.swing package.

 
 

JPasswordField constructors class:

JPasswordField constructors	Description
JPasswordField()	Constructor that creates a new Password field.
JPasswordField(int n)	Constructor that creates a new empty Password field with a specified number of columns.
JPasswordField(String Password)	Constructor that creates a new empty Password field initialized with the given string.
JPasswordField(String Password, int n)	Constructor that creates a new empty Password field with the given string and a specified number of columns.
JPasswordField(Document d, String Password, int n)	Constructor that creates a Password field that uses the given text storage model and the given number of columns.

 

Commonly used methods:

• getPassword(): returns the text in JPasswordField.
• getText(): returns the text in JPasswordField.
• getEchoChar(): returns the character used for Echo in JPasswordField.
• setEchoChar(char c): set the Echo character for JPasswordField.

 

Example of JPasswordField in Java Swing:

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

public class Main
{
  public static void main(String[] args) 
  {  
    JFrame frame = new JFrame();  
    
    final JPasswordField password = new JPasswordField(); 
    password.setBounds(120, 70, 150, 30); 
    
    JLabel label1 = new JLabel("Username:");  
    label1.setBounds(15, 20, 100, 30);  
    
    JLabel label2 = new JLabel("Password:");  
    label2.setBounds(15, 70, 100, 30);  
    
    JButton btn = new JButton("Login");
    btn.setBounds(100, 130, 110, 30);  
    
    final JTextField tf = new JTextField();
    tf.setBounds(120, 20, 150, 30); 
    
    frame.add(password); 
    frame.add(label1); 
    frame.add(label2); 
    frame.add(btn); 
    frame.add(tf);
        
    frame.setSize(300,230);  
    frame.setLayout(null);  
    frame.setVisible(true);   
    
    btn.addActionListener(new ActionListener()
    {
      public void actionPerformed(ActionEvent e) 
      {
        System.out.println("Username : "+ tf.getText());
        System.out.println("Password: "+ new String(password.getPassword()));    
      }
    });
  }
}

Output:

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