如何从单个输入中扫描不确定的数字列表？

Question

How to scan an indefinite list of numbers from a single input?

I did a brief google search and found hasNextInt(), but it only stops scanning if the last input is NOT an integer, while I need it to stop if it's the last integer. For example, it will continue to ask me if my list ends with an integer.

My code:

 System.out.println("Enter a list of numbers");
        int n = 0;
        while (input.hasNextInt()){
            n = input.nextInt();
            List.push(n);
        }
        List.displayStack();

Answer 1

You may use hasNext() instead. Then parse the input and get the number -

    int n=0;
    Scanner input = new Scanner(System.in);

    while (input.hasNext()) {
        try {
            n = Integer.parseInt(input.nextLine());
            //do something eg.- you have done
            //List.push(n);
        } catch (NumberFormatException nfe) { 
            //handle exception
        }
   }

Now if the input not is an integer then it will not stop. Rather it will go for the catch block. And since the catch block is still in the while loop so you can take a new input still now.

Hope it will help.
Thanks a lot