Java JPasswordField

The object of a JPasswordField class is a text component specialized for password entry. It allows the editing of a single line of text. It inherits JTextField class.

JPasswordField class declaration

Let's see the declaration for javax.swing.JPasswordField class.

Commonly used Constructors:

Constructor	Description
JPasswordField()	Constructs a new JPasswordField, with a default document, null starting text string, and 0 column width.
JPasswordField(int columns)	Constructs a new empty JPasswordField with the specified number of columns.
JPasswordField(String text)	Constructs a new JPasswordField initialized with the specified text.
JPasswordField(String text, int columns)	Construct a new JPasswordField initialized with the specified text and columns.

Java JPasswordField Example

import javax.swing.*;  
public class PasswordFieldExample {
	public static void main(String[] args) {  
	JFrame f=new JFrame("Password Field Example");  
	 JPasswordField value = new JPasswordField(); 
	 JLabel l1=new JLabel("Password:");  
	    l1.setBounds(20,100, 80,30);  
	     value.setBounds(100,100,100,30);  
            f.add(value);  f.add(l1);
            f.setSize(300,300);  
            f.setLayout(null);  
            f.setVisible(true);   
}
}

Output:

Java JPasswordField Example with ActionListener

import javax.swing.*;  
import java.awt.event.*;
public class PasswordFieldExample {
	public static void main(String[] args) {  
	JFrame f=new JFrame("Password Field Example");  
	 final JLabel label = new JLabel();          
	 label.setBounds(20,150, 200,50);
	 final JPasswordField value = new JPasswordField(); 
	 value.setBounds(100,75,100,30); 
	 JLabel l1=new JLabel("Username:");  
	    l1.setBounds(20,20, 80,30);  
	    JLabel l2=new JLabel("Password:");  
	    l2.setBounds(20,75, 80,30);  
	    JButton b = new JButton("Login");
	    b.setBounds(100,120, 80,30);  
	    final JTextField text = new JTextField();
	    text.setBounds(100,20, 100,30);  
                f.add(value); f.add(l1); f.add(label); f.add(l2); f.add(b); f.add(text);
                f.setSize(300,300);  
                f.setLayout(null);  
                f.setVisible(true);   
                b.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent e) {     
                   String data = "Username " + text.getText();
                   data += ", Password: " 
                   + new String(value.getPassword()); 
                   label.setText(data);        
                }
             }); 
}
}

Output: