Java 2-1

public class Test {public static void main(String[] args){Example2_3 s = new Example2_3();s.Sum();}}

import java.util.Scanner;public class Example2_3 {public void Sum(){System.out.println("请输入若干个数，每输入一个数回车确认");System.out.println("最后输入数字0结束输入操作");Scanner reader = new Scanner(System.in);double sum=0;double x = reader.nextDouble();while(x!=0){sum = sum + x;x = reader.nextDouble();}System.out.println("sum="+sum);}}