java.lang.ArrayIndexOutOfBoundsException: Index 5 out of bounds for length 5
Code accessed an array index outside 0 … length-1.
Exact message you may see
out of bounds for length
Seen on:
Java
Meaning
Arrays are zero-based, so the last valid index is length - 1. Off-by-one loops (i <= arr.length), empty arrays and split() returning fewer parts are typical.
Common causes
- Loop condition i <= length
- Empty array
- String.split() returning fewer elements
- Hard-coded indexes on variable-length data
⚡ Quick fix
- Use i < arr.length
- Check length before indexing
- Prefer enhanced for loops
Detailed fix by platform
Java
for (String s : parts) { … }
How to diagnose
- Index — Index and length in the message
- Source — Why is the array shorter?
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Last updated 13 Oct 2026