Conversion between byte array and int type in Java (two methods)

The conversion between byte array and int type in Java is the most basic algorithm in network programming. We all know that in socket transmission, the data sent and received by the sender are byte arrays, but the int type is composed of four bytes. How to convert an integer int into a byte array, and how to convert a byte array with length of 4 into an int type. There are two ways.

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