What is the output of the following Java code?public class ArrayComparison { public static void main(String[] args) { int[] arr1 = {1, 2, 3}; int[] arr2 = {1, 2, 3}; int[] arr3 = arr1; System.out.println(arr1 == arr2); System.out.println(arr2 == arr3); }}a)Compilation errorb)falsefalse c)NullPointerExceptiond)truetrue
Question
What is the output of the following Java code?public class ArrayComparison { public static void main(String[] args) { int[] arr1 = {1, 2, 3}; int[] arr2 = {1, 2, 3}; int[] arr3 = arr1; System.out.println(arr1 == arr2); System.out.println(arr2 == arr3); }}a)Compilation errorb)falsefalse c)NullPointerExceptiond)truetrue
Solution
The output of the given Java code will be:
false true
Explanation:
In Java, when we compare two arrays using the '==' operator, it doesn't compare the contents of the arrays, instead, it checks whether both arrays are pointing to the same memory location or not.
In the given code, arr1 and arr2 are two different arrays having the same elements. But they are located in different memory locations. So, arr1 == arr2 will return false.
On the other hand, arr3 is not a new array, it's just a reference to arr1. So, both arr3 and arr1 are pointing to the same memory location. Hence, arr2 == arr3 will return true.
So, the correct answer is d) true true.
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