Java JPasswordField

by Online Tutorials Library July 14, 2022

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 Jpasswardfield 1

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:

Java Jpasswardfield 2

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