Quick Answer

Handle invalid array access attempts.

Understanding the Issue

Thrown when accessing negative indexes or indexes >= array length. Common in loops with incorrect termination conditions.

The Problem

This code demonstrates the issue:

Java Error 
int[] arr = new int[5];
int val = arr[5]; // Throws (valid indexes 0-4)

The Solution

Here's the corrected code:

Java Fixed 
// Solution 1: Proper bounds checking
if (index >= 0 && index < arr.length) {
    val = arr[index];
}

// Solution 2: Enhanced for loop
for (int num : arr) { // Safely iterates all elements
    System.out.println(num);
}

// Solution 3: Use List instead
List<Integer> list = Arrays.asList(1, 2, 3);
Integer safeGet = list.get(index); // Throws IndexOutOfBounds

Key Takeaways

Always validate array indexes before access.