[Solved] Identify the error in the following Java code related to heap memory usage:public class Demo { public static void main(String[] args) { int[] arr = new int[5]; arr = null; System.out.println(arr.... | Java

Java - Memory Management Basics

Identify the error in the following Java code related to heap memory usage:

public class Demo {
  public static void main(String[] args) {
    int[] arr = new int[5];
    arr = null;
    System.out.println(arr.length);
  }
}

ANo error, prints 5

BNullPointerException at runtime

CCompilation error due to null assignment

DArray size becomes zero

Step-by-Step Solution

Solution:

Step 1: Understand array creation and null assignment
The array is created on heap with size 5, then arr reference is set to null.
Step 2: Analyze printing arr.length
Since arr is null, accessing arr.length causes a NullPointerException at runtime.
Final Answer:
NullPointerException at runtime -> Option B
Quick Check:
Accessing member on null reference throws exception [OK]

Quick Trick: Accessing null reference causes NullPointerException [OK]

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