2021-09-22 GUI(鼠标事件)

import java.awt.*;
import java.awt.event.*;

public class MouseAndKeyEvent {
    //定义该图形中所需的组件的引用
    private Frame f;
    private Button btn;

    public MouseAndKeyEvent() {
        init();
    }

    private void init() {
        f = new Frame("my frame");
        f.setBounds(300, 100, 500, 400);
        f.setLayout(new FlowLayout());
        btn = new Button("my Button");
        f.add(btn);
        myEvent();
        f.setVisible(true);
    }

    private void myEvent() {
        f.addWindowListener(new WindowAdapter() {

            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }

        });

        btn.addActionListener(e -> System.out.println("action ok"));

        btn.addMouseListener(new MouseAdapter() {
            private int count = 0;
            private int clickCount = 0;

            @Override
            public void mouseEntered(MouseEvent e) {
                System.out.println("鼠标进入到该组件：" + count++);
            }

            @Override
            public void mouseClicked(MouseEvent e) {
                if (e.getClickCount() == 2)
                    System.out.println("双击动作：" + clickCount++);
            }
            
        });
    }

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

}