建议你先学习一下几何画法

下面是示例程序源码:

import java.awt.geom.*;
import java.awt.*;
import javax.swing.*;

/**
*使用GeneralPath画圆柱的示例程序
*@author Eastsun
*@version 1.0 2006/12/20
*/
public class DrawColumn extends JPanel{
    /**
    *得到一个表示圆柱的GeneralPath
    *@param x 圆柱的左上角的x坐标
    *@param y 圆柱的左上角的y坐标
    *@param height 圆柱的高
    *@param radius 圆柱的半径
    *@param arch   圆柱底圆的弧高
    */
    public static GeneralPath getColumn(int x,int y,int height,int radius,int arch){
        GeneralPath path =new GeneralPath(new Ellipse2D.Float(x,y-arch,2*radius,2*arch));
        path.lineTo(x+2*radius,y+height);
        path.append(new Arc2D.Float(x,y+height-arch,2*radius,2*arch,0,-180,Arc2D.OPEN),false);
        path.lineTo(x,y);
        return path;
    }
    private int x,y,height,radius,arch;
    public DrawColumn(){
        x =40;
        y =80;
        height =120;
        radius =40;
        arch   =20;
    }
    public void paintComponent(Graphics g){
        super.paintComponent(g);
        Graphics2D g2 =(Graphics2D)g;
        g2.setColor(Color.white);
        g2.fillRect(0,0,getWidth(),getHeight());
        g2.setColor(Color.red);
        g2.draw(getColumn(x,y,height,radius,arch));
    }
    public static void main(String[] args){
        JFrame frame =new JFrame(\"DrawColumn\");
        JPanel panel =new DrawColumn();
        panel.setPreferredSize(new Dimension(320,240));
        frame.add(panel);               //注意,用JDK1.5或以上版本编译,否则需改为frame.getContentPane().add(panel);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setVisible(true);
    }
}

Eastsun,好强