How to implement the listeners using lambda expressions in Java?

Posted by Pinki | Updated on December 13, 2019

Problem Statement:
Write a program the listeners using lambda expressions in Java.

Solution:

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class LambdaListenerTest extends JFrame {

public static void main(String args[]) {

new LambdaListenerTest();

}

private JButton button;

public ClickMeLambdaTest() {

setTitle("Lambda Expression Test");

button = new JButton("Click Me!");

button.addActionListener(ae -> button1Click());

// lambda expression for ActionListener

getContentPane().add(button, BorderLayout.NORTH);

setSize(450, 300);

setLocationRelativeTo(null);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setVisible(true);

}

private int clickCount = 0;

public void button1Click() {

clickCount++;

if(clickCount == 1)

button.setText("Clicked!!!");

else

button.setText("Clicked " + clickCount + " times!!!");

}

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How to implement the listeners using lambda expressions in Java?

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