Question

求用面向对象求多个圆的面积

求用面向对象求多个圆的面积

Answer 1

public class Circle {
double P=3.14;
double R;
public void area(){
System.out.println("圆的面积为："+P*R*R);
}
}

public class test {
public static void main(String[] args) {
// TODO Auto-generated method stub
Circle c=new Circle();
c.R=2;
c.area();
}
}