ArrayIndexOutOfBoundsException in Java — What It Means and How to Fix It

ArrayIndexOutOfBoundsException is thrown when an array is accessed with an index outside its valid range.

Key points

• Read the full stack trace from the top — it names the exact class, method, and line where the exception originated

Example

int[] a = new int[3];\na[5] = 1;  // ArrayIndexOutOfBoundsException