Java中关于MouseWheelListener的鼠标滚轮事件详解

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class MouseWheelListener01 extends JFrame implements MouseWheelListener{
	public static void main(String[] args) {
		new MouseWheelListener01();
	}
	int h = 300;
	int w = 300;
	JPanel j = new JPanel();
	// 构造器
	MouseWheelListener01(){
    super("放缩滚轮");
	this.add(j);
	this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	this.setSize(h,w);
	this.setVisible(true);
    this.addMouseWheelListener(this);  // 添加鼠标滚轮事件
	}
    //利用滚轮事件将窗口放大和缩小
    public void mouseWheelMoved(MouseWheelEvent e) {
	// 如果鼠标滚轮向上旋转或远离用户，则为负值，如果鼠标滚轮向下旋转或朝向用户旋转，则为正值
    if(e.getWheelRotation()==1){
		h = h + 15;
		w = w + 15;
        this.setSize(h,w);
        this.validate();
        System.out.println("滑轮向前。。。。");
   }
    if(e.getWheelRotation()==-1){
		h = h - 15;
		w = w -15;
    this.setSize(h,w);
    this.validate();
    System.out.println("滑轮向后....");
  }
 }
}

   public void mouseClicked(MouseEvent e) {
    int modifiers = e.getModifiers();
    if ((modifiers & InputEvent.BUTTON2_MASK) == InputEvent.BUTTON2_MASK){
     System.out.println("middle button click");
    }
   }

   public void mouseClicked(MouseEvent e) {
    if (SwingUtilities.isMiddleMouseButton(e)){
     System.out.println("middle button click");
    }
   }