用JAVA语言编写在屏幕上绘制一个圆形并且分为思等分，分别填充4中不同的颜色。

//看看行不行：
package com;

import javax.swing.SwingUtilities;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics;

import javax.swing.JPanel;
import javax.swing.JFrame;

public class Circle extends JFrame {
private ChessPanel chessPanel=new ChessPanel(550);
private static final long serialVersionUID = 1L;
private JPanel jContentPane = null;

public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
Circle thisClass = new Circle();
thisClass.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
thisClass.setVisible(true);
}
});
}

/**
* This is the default constructor
*/
public Circle() {
super();
initialize();
}

/**
* This method initializes this
*
* @return void
*/
private void