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程序代码:
import java.awt.Color;
import acm.graphics.GOval;
import acm.program.GraphicsProgram;
public class COLOTEST extends GraphicsProgram {
    public void run(){
        Color 透明色=new Color(1,1,1,0);
        Color c=new Color(Color.GREEN.getRed(),Color.GREEN.getGreen(),Color.GREEN.getBlue(),100);
        GOval goval1=new GOval(150,150,80,80);
        goval1.setFilled(true);
        goval1.setColor(透明色);
        goval1.setFillColor(c);
        
        Color c2=new Color(Color.RED.getRed(),Color.RED.getGreen(),Color.RED.getBlue(),150);
        GOval goval2=new GOval(180,180,150,150);
        goval2.setFilled(true);
        goval2.setColor(透明色);
        goval2.setFillColor(c2);
        
        Color c3=new Color(Color.ORANGE.getRed(),Color.ORANGE.getGreen(),Color.ORANGE.getBlue(),200);
        GOval goval3=new GOval(205,205,200,200);
        goval3.setFilled(true);
        goval3.setColor(透明色);//去掉黑边
        goval3.setFillColor(c3);//填充图形色
        add(goval3);
        add(goval2);
        add(goval1);
    }
}