在多个条件下循环时程序绕过（java）

Question

I have this really simple code:

public class ArrayIO {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);    
        System.out.println("Enter a number from 50 to 150: ");
        int elements = sc.nextInt();

        while(elements<50 && elements>150) {
            System.out.println("Less than 50 or more than 150");
            elements = sc.nextInt();
        }
            sc.close();

            ArrayList<Integer> integers = new ArrayList<>();
            for(int i=1; i<=elements; i++) {
                integers.add(i);
            }

            integers.toArray();

            System.out.printf("Array size is %d\n", integers.size());

    }

}

but my program bypasses the while loop completely when it has more than one condition. It works just fine with only one condition. I feel like I'm doing some really stupid mistake, but I just can't quite get it for almost an hour already.

Answer 1

Change && to || if you want OR :

while(elements<50 || elements>150) {
    System.out.println("Less than 50 or more than 150");
...