How to Convert Integers and Byte Arrays in Java: A Beginner\'s Guide

Converting Byte Arrays to Integers and Vice Versa in Java

In Java, storing numbers in byte arrays is integral when handling low-level data. This article delves into the techniques to seamlessly convert between integers and byte arrays, catering to those with limited understanding of bit manipulation.

Converting an Integer to a 2-Byte Array

To convert an integer into a 2-byte array, the ByteBuffer class from the java.nio package can be utilized. It handles the conversion seamlessly:

<code class="java">short num = 0x0100; // 256 in decimal
ByteBuffer dbuf = ByteBuffer.allocate(2);
dbuf.putShort(num);
byte[] bytes = dbuf.array(); // { 0, 1 }</code>

Converting a Byte Array to an Integer

Conversely, to convert a byte array to an integer, the ByteBuffer can be used again:

<code class="java">byte[] arr = { 0x00, 0x01 };
ByteBuffer wrapped = ByteBuffer.wrap(arr); // big-endian by default
short num = wrapped.getShort(); // 1</code>

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