package jframe;
import java.awt.*;
import javax.swing.*;
public class DrawIcon implements Icon{
private int width;
private int height;
public int getIconHeight(){
return this.height;
}
public int getIconWidth(){
return this.width;
}
public DrawIcon(int width,int height){
this.width=width;
this.height=height;
}
public void paintIcon(Component arg0,Graphics arg1,int x,int y){ //这个地方,实例化icon对象时,并没有调用这个方法,但是却画图了。
arg1.fillOval(x, y, width, height);
}
public static void main(String[] args) {
DrawIcon icon = new DrawIcon(25,15);
JLabel j = new JLabel("test",icon,SwingConstants.CENTER);
//j.setIcon(icon);
JFrame jf = new JFrame();
Container c = jf.getContentPane();
c.add(j);
jf.setSize(100,100);
jf.setVisible(true);
jf.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
}
}
//这个地方,实例化icon对象时,并没有调用这个方法,但是却画图了。
请教,这是什么原因?