Question

我的程序不会停止运行，我不确定我做错了什么。在此先感谢您的帮助！

public static void main(String[] args) {

      Scanner in = new Scanner(System.in);

      ArrayList<NumberOperations> numOpsList = new ArrayList<NumberOperations>();

      System.out.println("Enter a list of positive integers separated "
                        + "with a space followed by 0:");


      int x = in.nextInt(); 

      NumberOperations newNumOp = null;

      while (x != 0) {
         newNumOp = new NumberOperations(x);

         numOpsList.add(newNumOp); 

         int index = 0;

         while (index < numOpsList.size()) {
            NumberOperations num = numOpsList.get(index);
            System.out.println("For: " + num);

            // add print statement for odds under num
            System.out.println("\tOdds Under: " + newNumOp.oddsUnder());

            // add print statement for powers of 2 under num
            System.out.println("\tPowers of 2 under: " + newNumOp.powersTwoUnder());

            index++;
         } 
      }

   }

Answer 1

行x = in.nextInt();必须在while循环中。

...

int x = -1; 
...

while (x != 0) {

     x = in.nextInt();
     ....
  }

Answer 2

我认为您应该检查索引而不是x或使用x -

X永远不会被设置为零，这会导致无限循环。

Answer 3

你有一个永不改变的循环条件x：

 While (x != 0){
  // loop code
 }

但是，循环代码不会改变x值。

Answer 4

您没有在外部WHILE循环中更新x。

修复java中的无限循环

4 个答案: