Java中Icon接口的應用（以JLabel為例）

This example shows the drawing of an icon using the Icon interface for the JLable component.

1. package com.han;
2. import java.awt.*;
3. import javax.swing.*;
5. /**
6. * This example shows the drawing of an icon using the Icon interface
7. * for the JLable component.
8. * @author han
9. *
10. */
11. public class DrawIcon implements Icon{
12. private int width;
13. private int height;
14. @Override
15. public int getIconHeight(){
16. return this.height;
17. }
18. @Override
19. public int getIconWidth(){
20. return this.width;
21. }
22. @Override
23. public void paintIcon(Component c, Graphics g, int x, int y){
24. g.setColor(Color.red);
25. g.fillOval(x, y, width, height);
26. }
27. /*the construct function*/
28. public DrawIcon(int width, int height){
29. this.width=width;
30. this.height=height;
31. }
32. public static void main(String[] args){
33. DrawIcon icon=new DrawIcon(15,15);
34. JLabel jl=new JLabel("測試",icon,SwingConstants.CENTER);
35. JFrame jf=new JFrame();
36. Container c=jf.getContentPane();
37. c.add(jl);
38. jf.setVisible(true);
39. jf.setSize(300,300);
40. jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
41. }
42. }