Set action command for JButton

Byron KiourtzoglouNovember 11th, 2012Last Updated: April 24th, 2013

2 3,403 1 minute read

In this example we are going to see how to set action command for JButton component. This is a very important task when working in a Java GUI application, as most of the times you have to bundle a button with a specific action.

In short, to set action command for JButton one should follow these steps:

Create a class that extends JFrame and implements ActionListener.
Create a new JButton.
Use JButton.addActionListener to add a specific ActionListener to this component.
Use JButton.setActionCommand to add a specific command to this component.
Override actionPerformed method and use ActionEvent.getActionCommand to get the command of the button. Then you can customize this command as you wish.

Let’s see the code:

package com.javacodegeeks.snippets.desktop;

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;

public class SetActionCommandForJButton extends JFrame implements ActionListener {

	private static final long serialVersionUID = 1L;

	public SetActionCommandForJButton() {

		// set flow layout for the frame
		this.getContentPane().setLayout(new FlowLayout());

		JButton button = new JButton("Java Code Geeks - Java Examples");

		//add Button
		add(button);

		//set action listeners for buttons
		button.addActionListener(this);

		// define a custom short action command for the button
		button.setActionCommand("Geeks");

		// add button to frame
		add(button);

	}

	@Override
	public void actionPerformed(ActionEvent ae) {
		String action = ae.getActionCommand();
		if (action.equals("Geeks")) {
			System.out.println("Button pressed!");
		}
	}

	private static void createAndShowGUI() {

  //Create and set up the window.

  JFrame frame = new SetActionCommandForJButton();

  //Display the window.

  frame.pack();

  frame.setVisible(true);

  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    }

	public static void main(String[] args) {

  //Schedule a job for the event-dispatching thread:

  //creating and showing this application's GUI.

  javax.swing.SwingUtilities.invokeLater(new Runnable() {

public void run() {

    createAndShowGUI(); 

}

  });
    }

}

This was an example on how to set the action command for JButton.

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Byron KiourtzoglouNovember 11th, 2012Last Updated: April 24th, 2013

2 3,403 1 minute read

public class SetActionCommandForJButton extends JFrame implements ActionListener { private static final long serialVersionUID = 1L; public SetActionCommandForJButton() { // set flow layout for the frame this.getContentPane().setLayout(new FlowLayout()); JButton button = new JButton("Java Code Geeks - Java Examples"); //add Button add(button); //set action listeners for buttons button.addActionListener(this); // define a custom short action command for the button button.setActionCommand("Geeks"); // add button to frame add(button);