关于哨兵的问题？初学者Java编程

Question

我有这个程序使用用户输入来查找输入的数字的总和，以及用户输入的最小数字和整数。

public static void main(String args[])
{

int numOfints = 0;
int numberin;
int sum = 0;
int small;

Scanner input = new Scanner(System.in);

System.out.print("Please enter the numbers. <-999 to stop>: ");
System.out.print("Please enter the first number: ");
numberin = input.nextInt();
small = numberin;

while(numberin!=-999)
{

numOfints++; 
sum+=numberin;

}
if (numberin >0)
{

System.out.println("Total number of numbers inputted was" +numOfints);
System.out.println("The sum of these numbers is " + sum);
System.out.println("The smallest number in the set is" + small);

}
else

System.out.println("The number set is empty, therefore no calculations can be performed.");

}

}

{

然而，当我运行程序时，唯一出现的是

c:\jwork>java lab7a
Please enter the numbers; <-999 to stop>: Please enter the first number: 1
_

并且它不允许来自用户的任何输入。为什么程序不会继续？

Answer 1

您没有任何方法可以在while循环中获取用户的输入。