BytesHelper Tutorial

BytesHelper provides small, stateless helpers for byte arrays.

Concatenating arrays

byte[] result = BytesHelper.concat(new byte[]{1, 2}, new byte[]{3, 4});
// [1, 2, 3, 4]

Hexadecimal encoding

String hex = BytesHelper.bytesToHexStr(new byte[]{0x1A, 0x2B});
// "1A2B"

The output uses uppercase hexadecimal characters.

Hexadecimal decoding

byte[] bytes = BytesHelper.parseHexStr2Byte("1A2B");

An empty string returns an empty byte array. Input must contain an even number of characters, and every character must be hexadecimal; otherwise IllegalArgumentException is thrown. Odd-length input is never silently truncated.