import java.awt.*;
public class Circle {
	int x;
	int y;	
	int diameter;
    Color color;
    
	public Circle()  {
		x = 0;
		y = 0;
		diameter = 200;
		color = Color.WHITE;
	}

	public Circle(int x, int y, int  diameter, Color  color)  {
		
		this.x = x;
		this.y = y;
		this.diameter = diameter;
		this.color = color;
	}
	
	public void  draw(Graphics  g)  {

		Color  colorSave = g.getColor();

		g.setColor(color);
		g.fillOval(x, y, diameter, diameter);
		
		g.setColor(colorSave);
	}
}
 	
TaiChi.java
	
import java.awt.*;

public class TaiChi extends Circle {
	Color colorLeft;
	Color colorRight;
	
	public TaiChi(){
		super();
		colorLeft = Color.WHITE;
		colorRight = Color.BLACK;
	}
	
	public TaiChi(int x, int y, int diameter, Color colorLeft, Color colorRight){
		
		super(x,y,diameter,colorLeft);
		this.colorLeft = colorLeft;
		this.colorRight = colorRight;
	}
	
	public void  draw(Graphics  g)  {
		Color  colorSave = g.getColor();
		
		super.draw(g);
		g.setColor(colorRight);
		g.fillOval(x+diameter/4, y+diameter/2, diameter/2, diameter/2);
                g.fillArc(x,y,diameter,diameter,270,180);



		g.setColor(colorLeft);
		g.fillOval(x+diameter/4, y, diameter/2, diameter/2);
		g.fillOval(x+diameter/2, y+diameter*3/4, diameter/20, diameter/20);
		g.setColor(colorRight);
		g.fillOval(x+diameter/2, y+diameter/4, diameter/20, diameter/20);
			
		g.setColor(colorSave);
	}
}