ComputeArea

import java.util.Scanner;public class ComputeArea{ public static void main(String args[]) {  final double PI=3.14159;  double area;  //从键盘获取圆的半径值。  double radius=0.0;  Scanner sc=new Scanner(System.in);  while(sc.hasNextDouble()){  radius=sc.nextDouble();   area=PI*radius*radius;   System.out.println("The area for the circle of 10 is"+area);   sc.close();     } }}