在actionlistener中更改布尔值

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

public class BooleanValueExample {
    private boolean flag = false; // 初始布尔值为false

    public static void main(String[] args) {
        BooleanValueExample example = new BooleanValueExample();
        example.createUI();
    }

    public void createUI() {
        JFrame frame = new JFrame("Boolean Value Example");
        JButton button = new JButton("Click Me");

        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                flag = !flag; // 在actionPerformed方法中更改布尔值
                System.out.println("Flag value: " + flag);
            }
        });

        frame.getContentPane().add(button);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setVisible(true);
    }
}