EXPERIMENT 12
Title: Write a program to demonstrate the use of JTextField and
JPasswordField using Listener Interface.
import javax.swing.*;
import java.awt.event.*;
public class Exp12 implements ActionListener
{
JTextField textField;
JPasswordField passwordField;
JLabel label;
Exp12()
{
JFrame f = new JFrame("JTextField and JPasswordField");
JLabel user = new JLabel("Username:");
user.setBounds(30, 30, 80, 30);
JLabel pass = new JLabel("Password:");
pass.setBounds(30, 70, 80, 30);
textField = new JTextField();
passwordField = new JPasswordField();
textField.setBounds(120, 30, 200, 30);
passwordField.setBounds(120, 70, 200, 30);
label = new JLabel();
label.setBounds(100, 150, 300, 30);
JButton submitButton = new JButton("Submit");
submitButton.setBounds(150, 110, 100, 30);
submitButton.addActionListener(this);
f.add(user);
f.add(pass);
f.add(textField);
f.add(passwordField);
Dasari N.S.
f.add(submitButton);
f.add(label);
f.setSize(400, 300);
f.setLayout(null);
f.setVisible(true);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public void actionPerformed(ActionEvent e)
{
String username = textField.getText();
String password = new String(passwordField.getPassword());
label.setText("Username: " + username + ", Password: " + password);
}
public static void main(String[] args)
{
new Exp12();
}
}
Output:
Dasari N.S.
Program 12.1: Write a program to change the background color of
Applet when user performs events using Mouse.
import javax.swing.*;
import java.awt.event.*;
public class Exp12_1 implements ActionListener
{
JTextField textField;
JPasswordField passwordField;
JLabel l;
Exp12_1()
{
JFrame frame = new JFrame("JPasswordField");
JLabel userLabel = new JLabel("Username:");
userLabel.setBounds(30, 30, 80, 30);
textField = new JTextField();
textField.setBounds(120, 30, 200, 30);
JLabel passLabel = new JLabel("Password:");
passLabel.setBounds(30, 70, 80, 30);
passwordField = new JPasswordField();
passwordField.setBounds(120, 70, 200, 30);
passwordField.setEchoChar('#');
l = new JLabel();
l.setBounds(30, 150, 300, 30);
JButton submitButton = new JButton("Submit");
submitButton.setBounds(150, 110, 100, 30);
submitButton.addActionListener(this);
frame.add(userLabel);
frame.add(textField);
frame.add(passLabel);
frame.add(passwordField);
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frame.add(submitButton);
frame.add(l);
frame.setSize(400, 300);
frame.setLayout(null);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public void actionPerformed(ActionEvent e)
{
String username = textField.getText();
String password = new String(passwordField.getPassword());
l.setText("Username: " + username + ", Password: " + password);
}
public static void main(String[] args)
{
new Exp12_1();
}
}
Output:
Dasari N.S.
Program 12.2: Write a program using JPasswordField and JTextField to
demonstrate the use of user authentication.
import javax.swing.*;
import java.awt.event.*;
public class Exp12_2 implements ActionListener
{
JTextField textField;
JPasswordField passwordField;
JLabel l;
private final String validUsername = "admin";
private final String validPassword = "123";
Exp12_2()
{
JFrame f = new JFrame("User Authentication");
JLabel user = new JLabel("Username:");
user.setBounds(30, 30, 80, 30);
JLabel pass = new JLabel("Password:");
pass.setBounds(30, 70, 80, 30);
textField = new JTextField();
passwordField = new JPasswordField();
textField.setBounds(120, 30, 200, 30);
passwordField.setBounds(120, 70, 200, 30);
l = new JLabel();
l.setBounds(100, 150, 300, 30);
JButton submitButton = new JButton("Submit");
submitButton.setBounds(150, 110, 100, 30);
submitButton.addActionListener(this);
f.add(user);
f.add(pass);
f.add(textField);
f.add(passwordField);
f.add(submitButton);
f.add(l);
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f.setSize(400, 300);
f.setLayout(null);
f.setVisible(true);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public void actionPerformed(ActionEvent e)
{
String username = textField.getText();
String password = new String(passwordField.getPassword());
if (username.equals(validUsername) &&
password.equals(validPassword))
{
l.setText("Login Successful!");
}
else
{
l.setText("Invalid Username or Password.");
}
}
public static void main(String[] args)
{
new Exp12_2();
}
}
Output:
Dasari N.S.
Program 12.3: Write a program using JTextField to perform the
addition of two numbers.
import javax.swing.*;
import java.awt.event.*;
public class Exp12_3 implements ActionListener
{
JTextField num1F;
JTextField num2F;
JLabel result;
Exp12_3()
{
JFrame f = new JFrame("Addition Calculator");
JLabel num1L = new JLabel("Number 1:");
num1L.setBounds(30, 30, 80, 30);
JLabel num2L = new JLabel("Number 2:");
num2L.setBounds(30, 70, 80, 30);
num1F = new JTextField();
num1F.setBounds(120, 30, 200, 30);
num2F = new JTextField();
num2F.setBounds(120, 70, 200, 30);
JButton add = new JButton("Add");
add.setBounds(150, 110, 100, 30);
add.addActionListener(this);
result = new JLabel();
result.setBounds(30, 150, 300, 30);
f.add(num1L);
f.add(num1F);
f.add(num2L);
f.add(num2F);
f.add(add);
f.add(result);
f.setSize(400, 250);
f.setLayout(null);
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f.setVisible(true);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public void actionPerformed(ActionEvent e)
{
try
{
int num1 = Integer.parseInt(num1F.getText());
int num2 = Integer.parseInt(num2F.getText());
int sum = num1 + num2;
result.setText("Result: " + sum);
}
catch (NumberFormatException ex)
{
result.setText("Please enter valid integers.");
}
}
public static void main(String[] args)
{
new Exp12_3();
}
}
Output:
Dasari N.S.
Program 12.4: Write a program using JPasswordField to accept
password from user and if the length is less than 6 characters then
error message should be displayed “Password length must be >6
characters”.
import javax.swing.*;
import java.awt.event.*;
public class Exp12_4 implements ActionListener
{
JPasswordField passwordField;
JLabel resultLabel;
Exp12_4()
{
JFrame frame = new JFrame("Password Validation");
JLabel passwordLabel = new JLabel("Enter Password:");
passwordLabel.setBounds(30, 30, 120, 30);
passwordField = new JPasswordField();
passwordField.setBounds(150, 30, 150, 30);
JButton submitButton = new JButton("Submit");
submitButton.setBounds(150, 70, 100, 30);
submitButton.addActionListener(this);
resultLabel = new JLabel();
resultLabel.setBounds(30, 110, 300, 30);
frame.add(passwordLabel);
frame.add(passwordField);
frame.add(submitButton);
frame.add(resultLabel);
frame.setSize(350, 200);
frame.setLayout(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
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public void actionPerformed(ActionEvent e)
{
String password = new String(passwordField.getPassword());
if (password.length() < 6)
{
resultLabel.setText("Password length must be > 6 characters");
}
else
{
resultLabel.setText("Password accepted");
}
}
public static void main(String[] args)
{
new Exp12_4();
}
}
Output:
Dasari N.S.
