JAVA中如何用graphics 作圆环

JAVA中如何用graphics 作圆环，可以设置圆环的内径，外径

package zhidao;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics;

import javax.swing.JApplet;
import javax.swing.JLabel;

public class Circle extends JApplet {
class Canvas extends JLabel {
public Canvas() {

}

@Override
public void paint(Graphics g) {
super.paint(g);
int w=getWidth();
int h=getHeight();
for (int i = 0; i < 10; i++) {
g.setColor(randColor());
int radius=(int)(Math.random()*51+80);
int x=(int)(Math.random()*(w-radius*2));
int y=(int)(Math.random()*(h-radius*2));
Ring ring = new Ring(x, y, radius,(float)(Math.random()/2+0.5));
ring.paint(g);
}
}
}
private Color randColor(){
int r=(int)(Math.random()*256);
int g=(int)(Math.random()*256);
int b=(int)(Math.random()*256);
return new Color(r,g,b);
}
public Circle() {

}

@Override
public void init() {
super.init();
setSize(500, 500);
getContentPane().add(new Canvas(), BorderLayout.CENTER);
}

}

class Ring {
private int x;
private int y;
// 外径
private int radius;
// 内径因子
private float factor;

public int getX() {
return x;
}

public int getY() {
return y;
}

public Ring(int x, int y, int radius, float factor) {
super();
this.x = x;
this.y = y;
this.radius = radius;
if (factor < 0 || factor > 1)
throw new IllegalArgumentException();
this.factor = factor;
}

public int getInsideRadius() {
return (int) (radius * factor + 0.5f);
}

public int getRadius() {
return radius;
}

public void paint(Graphics g) {
g.fillOval(x, y, radius, radius);
int iWidth = getInsideRadius();
int dif = Math.round((radius - iWidth) / 2f);
Color recent = g.getColor();
g.setColor(new Color(not(recent.getRGB())));
g.fillOval(x + dif, y + dif, iWidth, iWidth);
g.setColor(recent);

}

private int not(int color) {

return (~color) & 0xffffff;
}
}

两个圆，圆心一样半径不一样就是了

试一下这个： image image=toolkit.getdefaulttoolkit().getimage("图片名.jpg"); g.drawimage(image, 50, 160, 150,182, this);//设定位置

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