How to add onclick event to JButton using ActionListener in Java Swing

In this tutorial, we are going to see how to add onclick event to JButton using ActionListener in Java Swing.

 

JButton listener

If you want to add onclick event to JButton you need to add an ActionListener to a JButton, as shown in the following code snippet:

JButton btn = new JButton("Button");

btn.addActionListener(new ActionListener()
{
  public void actionPerformed(ActionEvent e)
  {
    //show jdialog when button is clicked
    JDialog dialog = new JDialog(frame, "Welcome to StackHowTo", true);
    dialog.setLocationRelativeTo(frame);
    dialog.setVisible(true);
  }
});

Place the code in the method “actionPerformed()” of the ActionListener class that you want to execute when the button is clicked. There are several ways to implement this:

• Implement it as shown above
• Request your class to implement an ActionListener
• Create another class as an ActionListener

 

Complete Example By implementing the ActionListener interface

import java.awt.event.*; 
import javax.swing.*; 
import java.awt.*; 

class JDialogExample extends JFrame implements ActionListener {
  
    static JFrame frame; 
   
    public static void main(String[] args) 
    {
        // create a frame
        frame = new JFrame("JDialog Example"); 
        // create an object
        JDialogExample obj = new JDialogExample(); 
        // create a panel 
        JPanel panel = new JPanel(); 
        JButton btn = new JButton("Click here"); 
        // add a listener to the button
        btn.addActionListener(obj); 
        // add button to panel
        panel.add(btn); 
        frame.add(panel); 
        frame.setSize(300, 300); 
        frame.show(); 
    } 
    public void actionPerformed(ActionEvent e) 
    { 
        String s = e.getActionCommand(); 
        if(s.equals("Click here"))
        {
            // Create a dialog box
            JDialog d = new JDialog(frame, "Dialog box"); 
            // Create a label
            JLabel l = new JLabel("This is a dialog box."); 
            // Add the label to the dialog box 
            d.add(l); 
            // Set the size of the dialog box 
            d.setSize(200, 100); 
            // Define the visibility of the dialog box
            d.setVisible(true); 
        } 
    } 
}

Output:

MCQPractice competitive and technical Multiple Choice Questions and Answers (MCQs) with simple and logical explanations to prepare for tests and interviews.Read More