Как проверить нажата ли кнопка java

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class ButtonExample implements ActionListener {

    public static void main(String[] args) {
        JFrame frame = new JFrame("Button Example");
        JPanel panel = new JPanel();
        JButton button = new JButton("Click me");
        button.addActionListener(new ButtonExample());
        panel.add(button);
        frame.add(panel);
        frame.setSize(300, 300);
        frame.setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        System.out.println("Button clicked!");
    }
}