Difference between ByteBuffer vs byte array in Java? Example Tutorial

There are several differences between a byte array and ByteBuffer class in Java, but the most important of them is that bytes from byte array always reside in Java heap space, but bytes in a ByteBuffer may potentially reside outside of the Java heap in case of direct byte buffer and memory mapped files. Buffer is a byte array like abstraction which was introduced in Java NIO release to read and write data from FileChannel. It is extensively used in Java NIO for transferring data from one place to another and its also an essential Java concepts to know for any backend developer, particularly those who wants to create non-blocking server application using NIO in Java.