How to Convert and Print Byte array to Hex String in Java

We often need to convert byte arrays to Hex String in Java, In order to print byte array contents in a readable format. Since many cryptographic algorithms e.g. MD5 returns hash value as a byte array, In order to see and compare that byte array, you need to convert byte array to Hex String. As we have seen, while generating MD5 checksum of File, there are multiple ways to convert byte array to Hexadecimal String in Java. You can either write your own method, or you can use open source library e.g. Apache commons codec to create Hex String from a byte array in Java. Commons codec provides a utility class Hex, which contains an encodeHexString() method to create Hex String from a byte array. It's one of the best options to generate Hex String if you are already using this library to generate MD5 hash values. In this Java tutorial, we will see what is the issue with printing byte array as normal String, and 2 examples to convert a byte array into Hexadecimal String in Java.

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