Why is the output showing error for the value of int?

Question

class lab1{

    public static void main(String[] args){

        int arr[]= new int[2147483647];
        System.out.println(arr.length);
    }
}

Answer 1

The problem is, as the error states, that the array is too big:

Exception in thread "main" java.lang.OutOfMemoryError: Requested array size exceeds VM limit
    at lab1.main(lab1.java:7)

This is because there is a set maximum size of arrays in Java.

For more information, you should see: Do Java arrays have a maximum size?