初学Java 从控制台读取输入

代码

 import java.util.Scanner;
 public class ComputeArea {
 public static void main(String[] args) {
 Scanner input = new Scanner(System.in);
 System.out.print("Enter a number for radius: ");
 double radius = input.nextDouble();
 double area;
 area = radius * radius * 3.14159;
 System.out.println("The area for the circle of radius " + radius + " is " + area);
 }

 }