Here you can find the source of unpack64(long num)
public static int[] unpack64(long num)
//package com.java2s; // it under the terms of the GNU Lesser General Public License as published by public class Main { /**/* w w w. j a v a2 s . c o m*/ * Reversed the pack64() function */ public static int[] unpack64(long num) { int a = (int) (num >>> 32); int b = (int) num; return new int[] { a, b }; } }