16.Icon、ImageIcon标签

Icon标签：

 1 package com.gui.lesson4;
 2 
 3 import javax.swing.*;
 4 import java.awt.*;
 5 
 6 //图标，需要实现类，Frame继承
 7 public class IconDemo extends JFrame implements Icon {
 8 
 9     private int width;
10     private int height;
11 
12     public IconDemo() {//无参构造
13     }
14 
15     public IconDemo(int width, int height) {
16         this.width = width;
17         this.height = height;
18     }
19 
20     public void init() {
21         IconDemo iconDemo = new IconDemo(15, 15);
22         //图标放在标签，也可以放在按钮上！
23         JLabel label = new JLabel("icontest", iconDemo, SwingConstants.CENTER);
24 
25         Container container = getContentPane();
26         container.add(label);
27 
28         this.setVisible(true);
29         this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
30 
31     }
32 
33     public static void main(String[] args) {
34         new IconDemo().init();
35     }
36 
37     @Override
38     public void paintIcon(Component c, Graphics g, int x, int y) {
39         g.fillOval(x, y, width, height);
40     }
41 
42     @Override
43     public int getIconWidth() {
44         return this.width;
45     }
46 
47     @Override
48     public int getIconHeight() {
49         return this.height;
50     }
51 }

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ImageIcon标签：

 1 package com.gui.lesson4;
 2 
 3 import javax.swing.*;
 4 import java.awt.*;
 5 import java.net.URL;
 6 
 7 public class ImageIconDemo extends JFrame {
 8     public ImageIconDemo() {
 9         //获取图片的地址
10         JLabel label = new JLabel("ImageIcon");
11         URL url = ImageIconDemo.class.getResource("tx.jpg");
12         ImageIcon imageIcon = new ImageIcon(url);
13         label.setIcon(imageIcon);
14         label.setHorizontalAlignment(SwingConstants.CENTER);
15 
16         Container contentPane = getContentPane();
17         contentPane.add(label);
18 
19         setBounds(100, 100, 300, 300);
20         setVisible(true);
21         setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
22     }
23 
24     public static void main(String[] args) {
25         new ImageIconDemo();
26     }
27 }

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