Help with JButton please.

First of all, I am extremely new to JButtons. I have watched a tutorial online and saw the basics of how it works, but the example I have only displays a message in the screen and I want to use the JButton for a different function than displaying text.

I want to put an if statement INSIDE each of the 2 JButtons that pop on the screen. Short example (not actually in java, but what I am trying to do):

if (button 1 is pressed)
{
perform certain actions
}

else if (button 2 is pressed)
{
dont perform actions and go back to how it was before pressed
}


This is the simple JButton program I have made. Any help or any link to a tutorial would be HUGELY appreciated. Thank you very much.

Code:

---

import java.awt.FlowLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JOptionPane;

public class Gui extends JFrame
{
        private JButton reg;
        private JButton custom;
        //private JButton custom;
       
        public Gui ()
        {
                super("The title");
                setLayout(new FlowLayout());
               
                reg = new JButton("Check");
                custom = new JButton("Pass");
                add(reg);
                add(custom);
               
               
                HandlerClass handler = new HandlerClass();
                reg.addActionListener(handler);
                custom.addActionListener(handler);
        }
       
        private class HandlerClass implements ActionListener
        {

                @Override
                public void actionPerformed(ActionEvent event)
                {
                        JOptionPane.showMessageDialog(null, String.format("%s", event.getActionCommand()));
                }
               
               
        }
}

---

Code:

---

import javax.swing.JFrame;

public class ButtonTester
{
        public static void main(String[] args)
        {
                Gui go = new Gui();
                go.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                go.setSize(300,200);
                go.setVisible(true);               
               
        }
       

}

---

You can do it two ways, either make a new listener for every button, or attach the same listener to all the buttons and check which button was pressed inside the actionPerformed. Take a look at the ActionEvent methods, I'm pretty sure the one you are using "getActionCommand()" gives you the name of the button that was clicked.