Here you can find the source of is64BitArchitecture()
public static boolean is64BitArchitecture()
//package com.java2s; /*//www. j av a2 s. c o m Copyright 2015 Google Inc. All Rights Reserved. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. */ public class Main { /** * Returns true if the current system has a 64bit architecture. */ public static boolean is64BitArchitecture() { if (isRunningWindows()) { return "AMD64".equals(System.getenv("PROCESSOR_ARCHITECTURE")) || "AMD64".equals(System.getenv("PROCESSOR_ARCHITEW6432")); } throw new RuntimeException("Not implememted for Linux or Mac yet."); } /** * Determines whether the program is running in Windows. * * @return true, if the program is running in Windows, false otherwise. */ public static boolean isRunningWindows() { return System.getProperty("os.name").startsWith("Windows"); } }