Java tutorial
//package com.java2s; import java.nio.ByteBuffer; public class Main { public static long bytesToLong(byte[] bytes) { long l = 0; try { ByteBuffer buffer = ByteBuffer.allocate(8); buffer.put(bytes, 0, bytes.length); buffer.flip();//need flip l = buffer.getLong(); } catch (Exception e) { } return l; } }