Java tutorial
//package com.java2s; import java.io.ByteArrayInputStream; import java.io.DataInputStream; import java.io.IOException; public class Main { public static long byteArrayToLong(byte[] input) { try { ByteArrayInputStream bis = new ByteArrayInputStream(input); DataInputStream dis = new DataInputStream(bis); long numb = dis.readLong(); dis.close(); return numb; } catch (IOException e) { throw new RuntimeException(e); } } }