JAVA---用面向对象的方法求圆的面积

package lll;


public class Test {
	public static void main(String[] args) {
		Circle c1=new Circle();
		c1.radius=2;
		System.out.println(c1.findArea());
	}
}
class Circle{
	double radius;
	public double findArea(){
		return Math.PI*radius*radius;
	}
}