GUI编程笔记08：GUI通过鼠标移动到按钮上更改背景色案例

  1 package cn.itcast_06;
  2 
  3 import java.awt.Button;
  4 import java.awt.Color;
  5 import java.awt.FlowLayout;
  6 import java.awt.Frame;
  7 import java.awt.event.MouseAdapter;
  8 import java.awt.event.MouseEvent;
  9 import java.awt.event.WindowAdapter;
 10 import java.awt.event.WindowEvent;
 11 
 12 public class FrameDemo {
 13     public static void main(String[] args) {
 14         // 创建窗体对象
 15         final Frame f = new Frame("更改背景色");
 16         // 设置窗体属性和布局
 17         f.setBounds(400, 200, 400, 300);
 18         f.setLayout(new FlowLayout());
 19 
 20         // 创建四个按钮
 21         Button redButton = new Button("红色");
 22         Button greenButton = new Button("绿色");
 23         Button buleButton = new Button("蓝色");
 24 
 25         // 添加按钮
 26         f.add(redButton);
 27         f.add(greenButton);
 28         f.add(buleButton);
 29 
 30         // 设置窗体关闭
 31         f.addWindowListener(new WindowAdapter() {
 32             @Override
 33             public void windowClosing(WindowEvent e) {
 34                 System.exit(0);
 35             }
 36         });
 37 
 38         // 对按钮添加动作事件，点击按钮
 39         // redButton.addActionListener(new ActionListener() {
 40         // @Override
 41         // public void actionPerformed(ActionEvent e) {
 42         // f.setBackground(Color.RED);
 43         // }
 44         // });
 45 
 46         // 对按钮添加鼠标点击事件，鼠标点击按钮，这与上面效果一样
 47         // redButton.addMouseListener(new MouseAdapter() {
 48         // @Override
 49         // public void mouseClicked(MouseEvent e) {
 50         // f.setBackground(Color.RED);
 51         // }
 52         // });
 53 
 54         // 对按钮添加鼠标的进入事件，鼠标箭头一旦进入按钮区域，就会触发事件
 55         redButton.addMouseListener(new MouseAdapter() {
 56             @Override
 57             public void mouseEntered(MouseEvent e) {
 58                 f.setBackground(Color.RED);
 59             }
 60         });
 61 
 62         redButton.addMouseListener(new MouseAdapter() {
 63             @Override
 64             public void mouseExited(MouseEvent e) {
 65                 f.setBackground(Color.WHITE);
 66             }
 67         });
 68 
 69         greenButton.addMouseListener(new MouseAdapter() {
 70             @Override
 71             public void mouseEntered(MouseEvent e) {
 72                 f.setBackground(Color.GREEN);
 73             }
 74         });
 75 
 76         greenButton.addMouseListener(new MouseAdapter() {
 77             @Override
 78             public void mouseExited(MouseEvent e) {
 79                 f.setBackground(Color.WHITE);
 80             }
 81         });
 82 
 83         buleButton.addMouseListener(new MouseAdapter() {
 84             @Override
 85             public void mouseEntered(MouseEvent e) {
 86                 f.setBackground(Color.BLUE);
 87             }
 88         });
 89 
 90         buleButton.addMouseListener(new MouseAdapter() {
 91             @Override
 92             public void mouseExited(MouseEvent e) {
 93                 f.setBackground(Color.WHITE);
 94             }
 95         });
 96 
 97         // 设置窗体显示
 98         f.setVisible(true);
 99     }
100 }