Java从一行读取多个变量，但如何使用一个变量终止？

Question

Scanner br = new Scanner(System.in);
int a = br.nextInt();
int b = br.nextInt();
int c = br.nextInt();

If I only want to enter a single value, for example "0" to terminate the program, how do I do that? Because with the code above you have to enter 3 values, right?

Answer 1

Try using a while loop, and a list to store the data.

boolean mustContinue = true;
List<Integer> result = new ArrayList<Integer>();
while(mustContinue) {
    Integer a = br.nextInt();
    if(a == 0) {
        mustContinue = false;
    } else {
        result.add(a);
    }
}

This is not a complete running code, it's just to give you an idea of a possible solution. There are some thing to care of in order to make it a complete running code (for example check br.hasNextInt() to prevent exception, etc).

Answer 2

You can do it by using a while loop, it will end when you type 0:

    Scanner sc = new Scanner(System.in);

    int num;
    while (sc.hasNextInt() && ((num = sc.nextInt()) != 0))
    {
        // do something
    }