输入输出 Java

import java.uilt.Scanner;
public class output{
public static void main(String[] args){
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+=x;
x=reader.nextDouble();
}
System.out.println("sum="+sum);
}

}