circle.java

Java语言是目前最流行

class Circle
{
	public int Radius;
	public float Length;
	public float Area;
	final double PI=3.14159;
	
	public void Calculate( Graphics g,int x)
	{
		Length = 2 * PI * Radius;
		Area = PI * Radius * Radius;
		g.drawString("圆的周长为："+Length,30,x+15);	
		g.drawString("圆的面积为："+Area,30,x+25);	
	}
	
};