关于java绘制图形！！

[lok_le]

这个程序时绘制3个风扇，3个风扇能分开控制。
问题出在风扇能运行，但图形不能显示；
是repaint()有问题吗？？
请教！！！

import javax.swing.*;
import java.awt.event.*;
import javax.swing.event.*;
import java.util.ArrayList;
import java.awt.geom.*;
import java.awt.*;
import java.lang.Exception.*;
//import
public class FanTest
{ public static void main(String []args)
{ JFrame f=new JFrame();
f.setSize(900,500);
f.setTitle("FanTest");
f.setLayout(new FlowLayout(FlowLayout.LEFT));
APanel p1=new APanel();
APanel p2=new APanel();
APanel p3=new APanel();
f.add(p1);
f.add(p2);
f.add(p3);
//FanButtonPanel fb=new FanButtonPanel();
//f.add(fb,FlowLayout.CENTER);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);

}

}
class APanel extends JPanel
{ private JPanel fbp;
private FanPanel fp;
public APanel()
{ fp=new FanPanel();
add(fp);
fbp=new JPanel();
setFanButtonPanel();
add(fbp);

}
public void setFanButtonPanel()
{ setSize(300,400);
JButton start=new JButton("start");
Start st=new Start();

start.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{ //FanPanel fp=new FanPanel();
Fan []f=new Fan[4];
Fan f1=new Fan(360-15);
f[0]=f1;
f1=new Fan(90-15);
f[1]=f1;
f1=new Fan(180-15);
f[2]=f1;
f1=new Fan(270-15);
f[3]=f1;
for(Fan f2:f)fp.addfan(f2);
FanThread ft=new FanThread(fp,f,2.0);
Thread t=new Thread(ft);
t.start();
}
});

JButton stop=new JButton("stop");
Stop sp=new Stop();
stop.addActionListener(sp);
start.setSize(150,100);
stop.setSize(150,100);

add(start);
add(stop);
}
}
class Stop implements ActionListener
{ public void actionPerformed(ActionEvent e)
{
}
}

class FanPanel extends JPanel
{ private ArrayList<Fan> fal=new ArrayList<Fan>();
public void addfan(Fan f)
{ fal.add(f);
}
public void paintComponent(Graphics g)
{ super.paintComponent(g);
Graphics2D g1=(Graphics2D)g;
g1.setColor(Color.RED);
for(Fan f:fal)
{ g1.fill(f.getShape());
}
}
}
class Fan
{ private int s;
private static final double x=20,y=20,r=130,xx=x+r,yy=y+r;
public Fan(int s1)
{ s=s1;
}
public Arc2D.Double getShape()
{ return new Arc2D.Double(x,y,r,r,s,30,Arc2D.Double.PIE);
//return arc;
}
public void move()
{ s%=360;
s++;
System.out.println("move");
}
}

class FanThread implements Runnable
{ private FanPanel fp;
private Fan []fs=new Fan[4];
private double v;
public FanThread(FanPanel fp1,Fan [] f1,double v1)
{ fp=fp1;
for(int i=0;i<4;i++)
{ fs[i]=f1[i];
}
fs=f1;
v=v1;
System.out.println("FanThread");
}
public void setV(int v1)
{ v=v1;
}
public void run()
{ try
{ System.out.println("run");
while(v!=0)
{ for(Fan f:fs)
{ f.move();
}
fp.repaint();
Thread.sleep((int)(v*1000));
}

}
catch(InterruptedException ie)
{ ie.printStackTrace();
}
}
}

[gentalguo]

你布局的问题
你所添加的画图的Panel只有那么一点点，你是根本无法看到的。你只要加上一句话就可以看到你的FanPanel的位置和区域
在你的APanel的构造函数中加入fp.setBorder(BorderFactory.createLineBorder(Color.black));
你可以看到你的那个panel只有一点点，当然画了你也看不到。
你的布局说实话……相当混乱哦~~~~~~
代码的逻辑是没有问题的。建议学习一下那几种布局管理器。

而且说句额外的话，为什么每次点击start按钮的时候，你整个数组都要重新构造呢？
构造一次，之后就直接使用不行吗？你这样的话，效率有不少的浪费、不过这些就看你自己的了。我只帮你把那图显示出来了。而且，说实话，这样做也不好。我也就在你的基础上改了，不去自己重新构造了。
代码给你，自己去体会吧：

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.Arc2D;
import java.util.ArrayList;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;

//import 
public class FanTest {
	public static void main(String[] args) {
		JFrame f = new JFrame();
		f.setSize(900, 500);
		f.setTitle("FanTest");
		APanel p1 = new APanel();
		APanel p2 = new APanel();
		APanel p3 = new APanel();

		Container c = f.getContentPane();
		c.setLayout(new FlowLayout());
		c.add(p1);
		c.add(p2);
		c.add(p3);
		// FanButtonPanel fb=new FanButtonPanel();
		// f.add(fb,FlowLayout.CENTER);
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		f.setVisible(true);

	}

}

class APanel extends JPanel {
	private JPanel fbp;
	private FanPanel fp;

	public APanel() {
		setPreferredSize(new Dimension(300, 200));
		setLayout(new BorderLayout());
		fbp = new JPanel();
		setFanButtonPanel(fbp);
		add(fbp, BorderLayout.NORTH);
		fp = new FanPanel();
		fp.setBorder(BorderFactory.createLineBorder(Color.black));
		add(fp);
	}

	public void setFanButtonPanel(JPanel fbp) {
		setSize(300, 500);
		JButton start = new JButton("start");
		// Start st = new Start();

		start.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) { // FanPanel fp=new
				// FanPanel();
				Fan[] f = new Fan[4];
				Fan f1 = new Fan(360 - 15);
				f[0] = f1;
				f1 = new Fan(90 - 15);
				f[1] = f1;
				f1 = new Fan(180 - 15);
				f[2] = f1;
				f1 = new Fan(270 - 15);
				f[3] = f1;
				for (Fan f2 : f)
					fp.addfan(f2);
				FanThread ft = new FanThread(fp, f, 2.0);
				Thread t = new Thread(ft);
				t.start();

				fp.repaint();
			}
		});

		JButton stop = new JButton("stop");
		Stop sp = new Stop();
		stop.addActionListener(sp);
		start.setSize(150, 100);
		stop.setSize(150, 100);

		fbp.add(start);
		fbp.add(stop);
	}
}

class Stop implements ActionListener {
	public void actionPerformed(ActionEvent e) {
	}
}

class FanPanel extends JPanel {

	private ArrayList<Fan> fal = new ArrayList<Fan>();

	public void addfan(Fan f) {
		fal.add(f);
	}

	public void paintComponent(Graphics g) {
		super.paintComponent(g);
		Graphics2D g1 = (Graphics2D) g;
		g1.setColor(Color.RED);
		for (Fan f : fal) {
			g1.fill(f.getShape());
			// g.drawRect(50, 50, 20, 20);

		}
	}
}

class Fan {
	private int s;
	private static final double x = 20, y = 20, r = 130, xx = x + r,
			yy = y + r;

	public Fan(int s1) {
		s = s1;
	}

	public Arc2D.Double getShape() {
		return new Arc2D.Double(x, y, r, r, s, 30, Arc2D.Double.PIE);
		// return arc;
	}

	public void move() {
		s %= 360;
		s++;
		System.out.println("move");
	}
}

class FanThread implements Runnable {
	private FanPanel fp;
	private Fan[] fs = new Fan[4];
	private double v;

	public FanThread(FanPanel fp1, Fan[] f1, double v1) {
		fp = fp1;
		for (int i = 0; i < 4; i++) {
			fs[i] = f1[i];
		}
		fs = f1;
		v = v1;
		System.out.println("FanThread");
	}

	public void setV(int v1) {
		v = v1;
	}

	public void run() {
		try {
			System.out.println("run");
			while (v != 0) {
				for (Fan f : fs) {
					f.move();
				}
				fp.repaint();
				Thread.sleep((int) (v * 1000));
			}

		} catch (InterruptedException ie) {
			ie.printStackTrace();
		}
	}
}

[lok_le]

请哪位大侠指点指点！！！！！