Here you can find the source of unsignedInt(int value)
public static Integer unsignedInt(int value)
//package com.java2s; public class Main { /**/*from w w w .j av a 2 s . com*/ * Convert an unsigned 32-bit integer to a string. */ public static Integer unsignedInt(int value) { if (value < 0) { return (int) ((value) & 0x00000000FFFFFFFFL); } return value; } }