在mouseClicked函数中增加一个数字

import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JLabel;

public class Main extends JFrame {
    private JLabel label;

    public Main() {
        label = new JLabel("点击次数：0");
        add(label);

        addMouseListener(new MouseAdapter() {
            int clickCount = 0;

            public void mouseClicked(MouseEvent e) {
                clickCount++;
                label.setText("点击次数：" + clickCount);
            }
        });

        setSize(300, 200);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
    }

    public static void main(String[] args) {
        new Main();
    }
}