我刚开始学习java，我画了一个五环怎么将它放在图像显示器的中央啊？？？？

package xiong;
import java.awt.Color;

import acm.graphics.GOval;
import acm.program.GraphicsProgram;

public class WuHuan extends GraphicsProgram
{
    private int point_x = 100;
    private int point_y = 200;
    private static final int DIAMETER = 100;
    private static final int SPACE = 20;

        public void init()
        {
            setSize(800,800);
            // TODO Auto-generated method stub
        
        }
        @Override
        public void run()
        {
            GOval BLUE = new GOval(DIAMETER,DIAMETER);
            BLUE.setColor(Color.BLUE);
            add(BLUE,point_x,point_y);
            
            GOval BLACK = new GOval(DIAMETER,DIAMETER);
            BLACK.setColor(Color.BLACK);
            add(BLACK,point_x + DIAMETER + SPACE,point_y);
            
            GOval RED = new GOval(DIAMETER,DIAMETER);
            RED.setColor(Color.RED);
            add(RED,point_x + 2*DIAMETER + 2*SPACE,point_y);
            
            GOval YELLOW = new GOval(DIAMETER,DIAMETER);
            YELLOW.setColor(Color.YELLOW);
            add(YELLOW,point_x + DIAMETER/2 + SPACE/2,point_y + DIAMETER/2);
            
            GOval GREEN = new GOval(DIAMETER,DIAMETER);
            GREEN.setColor(Color.GREEN);
            add(GREEN,point_x + DIAMETER/2 + SPACE/2 + SPACE + DIAMETER,point_y + DIAMETER/2);
        }

   

}

acm..不是Java标准库的包吧  通常你可以getWidth() getHeight()获得容器的宽高 中心点就是 w/2,h/2 然后算吧。。

恩恩好好我试试