How To Add Action To All Buttons In A JPanel Using Java

In this Java Tutorial we will see How To Create A Function To Set An ActionListener To All The JButtons Inside A JFrame Using JPanel In Java Programming Language NetBeans IDE .

Project Source Code:

public void addAction()

{

Component[] components = jPanel1.getComponents();

for(Component component : components)

{

if(component instanceof JButton)

{

JButton button = (JButton) component;

button.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

System.out.println(button.getText());

}

});

}

////// OUTPUT :

add ActionListener to all jbuttons in java

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How To Extends From JFrame And Implements ActionListener In Java

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Source Code:

package JavaDB_001;

import java.awt.Color;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.*;

//Extends From JFrame

//implements ActionListener

public class Project extends JFrame implements ActionListener{

JTextField num1 = new JTextField(20);

JTextField num2 = new JTextField(20);

JTextField sum = new JTextField(20);

JButton btn = new JButton("Calcul");

public Project(){

num1.setBounds(20, 10, 100, 20);

num2.setBounds(20, 40, 100, 20);

btn.setBounds(140, 20, 100, 20);

sum.setBounds(250, 20, 100, 20);

//Add the ActionListener to the Button

btn.addActionListener(this);

setLayout(null);

add(num1);

add(num2);

add(btn);

add(sum);

setSize(400, 120);

setLocationRelativeTo(null);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

getContentPane().setBackground(Color.decode("#bdb76b"));

setVisible(true);

}

public static void main(String[] args){

new Project();

}

@Override

public void actionPerformed(ActionEvent e) {

int a = Integer.parseInt(num1.getText());

int b = Integer.parseInt(num2.getText());

int c = a + b;

sum.setText(Integer.toString(c));

}

///////////////////////////////////////////////////////////////////////OUTPUT:

OUTPUT FORM

When we click in the button we will see the sum of the two textboxes in another textbox