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);

 }

 }