How do I programmatically determine operating system in Java?

I would like to determine the operating system of the host that my Java program is running programmatically (for example: I would like to be able to load different properties based on whether I am on a Windows or Unix platform). What is the safest way to do this with 100% reliability?

Asked by: Marcus325 | Posted: 28-01-2022

Answer 1

You can use:


P.S. You may find this code useful:

class ShowProperties {
    public static void main(String[] args) {

All it does is print out all the properties provided by your Java implementations. It'll give you an idea of what you can find out about your Java environment via properties. :-)

Answered by: Kristian589 | Posted: 01-03-2022

Answer 2

As indicated in other answers, System.getProperty provides the raw data. However, the Apache Commons Lang component provides a wrapper for java.lang.System with handy properties like SystemUtils.IS_OS_WINDOWS, much like the aforementioned Swingx OS util.

Answered by: Arthur191 | Posted: 01-03-2022

Answer 3

Oct. 2008:

I would recommend to cache it in a static variable:

public static final class OsUtils
   private static String OS = null;
   public static String getOsName()
      if(OS == null) { OS = System.getProperty(""); }
      return OS;
   public static boolean isWindows()
      return getOsName().startsWith("Windows");

   public static boolean isUnix() // and so on

That way, every time you ask for the Os, you do not fetch the property more than once in the lifetime of your application.

February 2016: 7+ years later:

There is a bug with Windows 10 (which did not exist at the time of the original answer).
See "Java's “” for Windows 10?"

Answered by: Ted775 | Posted: 01-03-2022

Answer 4

some of the links in the answers above seem to be broken. I have added pointers to current source code in the code below and offer an approach for handling the check with an enum as an answer so that a switch statement can be used when evaluating the result:

OsCheck.OSType ostype=OsCheck.getOperatingSystemType();
switch (ostype) {
    case Windows: break;
    case MacOS: break;
    case Linux: break;
    case Other: break;

The helper class is:

 * helper class to check the operating system this Java VM runs in
 * please keep the notes below as a pseudo-license
 * compare to
import java.util.Locale;
public static final class OsCheck {
   * types of Operating Systems
  public enum OSType {
    Windows, MacOS, Linux, Other

  // cached result of OS detection
  protected static OSType detectedOS;

   * detect the operating system from the System property and cache
   * the result
   * @returns - the operating system detected
  public static OSType getOperatingSystemType() {
    if (detectedOS == null) {
      String OS = System.getProperty("", "generic").toLowerCase(Locale.ENGLISH);
      if ((OS.indexOf("mac") >= 0) || (OS.indexOf("darwin") >= 0)) {
        detectedOS = OSType.MacOS;
      } else if (OS.indexOf("win") >= 0) {
        detectedOS = OSType.Windows;
      } else if (OS.indexOf("nux") >= 0) {
        detectedOS = OSType.Linux;
      } else {
        detectedOS = OSType.Other;
    return detectedOS;

Answered by: Dainton189 | Posted: 01-03-2022

Answer 5

The following JavaFX classes have static methods to determine current OS (isWindows(),isLinux()...):

  • com.sun.javafx.PlatformUtil
  • com.sun.javafx.util.Utils


if (PlatformUtil.isWindows()){

Answered by: Tess197 | Posted: 01-03-2022

Answer 6


For accessing OS use: System.getProperty("").

But WAIT!!!

Why not create a utility class, make it reusable! And probably much faster on multiple calls. Clean, clear, faster!

Create a Util class for such utility functions. Then create public enums for each operating system type.

public class Util {     
        public enum OS {
        };// Operating systems.

    private static OS os = null;

    public static OS getOS() {
        if (os == null) {
            String operSys = System.getProperty("").toLowerCase();
            if (operSys.contains("win")) {
                os = OS.WINDOWS;
            } else if (operSys.contains("nix") || operSys.contains("nux")
                    || operSys.contains("aix")) {
                os = OS.LINUX;
            } else if (operSys.contains("mac")) {
                os = OS.MAC;
            } else if (operSys.contains("sunos")) {
                os = OS.SOLARIS;
        return os;

Now, you can easily invoke class from any class as follows,(P.S. Since we declared os variable as static, it will consume time only once to identify the system type, then it can be used until your application halts. )

            switch (Util.getOS()) {
            case WINDOWS:
                //do windows stuff
            case LINUX:

and That is it!

Answered by: Ryan305 | Posted: 01-03-2022

Answer 7

A small example of what you're trying to achieve would probably be a class similar to what's underneath:

import java.util.Locale;

public class OperatingSystem
    private static String OS = System.getProperty("", "unknown").toLowerCase(Locale.ROOT);

    public static boolean isWindows()
        return OS.contains("win");

    public static boolean isMac()
        return OS.contains("mac");

    public static boolean isUnix()
        return OS.contains("nux");

This particular implementation is quite reliable and should be universally applicable. Just copy and paste it into your class of choice.

Answered by: Rafael767 | Posted: 01-03-2022

Answer 8

Try this,simple and easy


Answered by: Sarah859 | Posted: 01-03-2022

Answer 9

If you're interested in how an open source project does stuff like this, you can check out the Terracotta class ( that handles this junk here:

And you can see a similar class to handle JVM versions ( and here:

Answered by: Sarah682 | Posted: 01-03-2022

Answer 10

I think following can give broader coverage in fewer lines

import org.apache.commons.exec.OS;

if (OS.isFamilyWindows()){
                //load some property
else if (OS.isFamilyUnix()){
                //load some other property

More details here:

Answered by: Rubie115 | Posted: 01-03-2022

Answer 11

Below code shows the values that you can get from System API, these all things you can get through this API.

public class App {
    public static void main( String[] args ) {
        //Operating system name

        //Operating system version

        //Path separator character used in java.class.path

        //User working directory

        //User home directory

        //User account name

        //Operating system architecture

        //Sequence used by operating system to separate lines in text files

        System.out.println(System.getProperty("java.version")); //JRE version number

        System.out.println(System.getProperty("java.vendor.url")); //JRE vendor URL

        System.out.println(System.getProperty("java.vendor")); //JRE vendor name

        System.out.println(System.getProperty("java.home")); //Installation directory for Java Runtime Environment (JRE)




Windows 7

Oracle Corporation
C:\Program Files\Java\jre7

Answered by: Audrey257 | Posted: 01-03-2022

Answer 12

If you're working in a security sensitive environment, then please read this through.

Please refrain from ever trusting a property obtained via the System#getProperty(String) subroutine! Actually, almost every property including os.arch,, and os.version isn't readonly as you'd might expect — instead, they're actually quite the opposite.

First of all, any code with sufficient permission of invoking the System#setProperty(String, String) subroutine can modify the returned literal at will. However, that's not necessarily the primary issue here, as it can be resolved through the use of a so called SecurityManager, as described in greater detail over here.

The actual issue is that any user is able to edit these properties when running the JAR in question (through, -Dos.arch=, etc.). A possible way to avoid tampering with the application parameters is by querying the RuntimeMXBean as shown here. The following code snippet should provide some insight into how this may be achieved.

RuntimeMXBean runtimeMxBean = ManagementFactory.getRuntimeMXBean();
List<String> arguments = runtimeMxBean.getInputArguments();

for (String argument : arguments) {
    if (argument.startsWith("") {
        // System.getProperty("") altered
    } else if (argument.startsWith("-Dos.arch") {
        // System.getProperty("os.arch") altered

Answered by: Miller948 | Posted: 01-03-2022

Answer 13

I find that the OS Utils from Swingx does the job.

Answered by: Catherine438 | Posted: 01-03-2022

Answer 14

String osName = System.getProperty("");
System.out.println("Operating system " + osName);

Answered by: Roman572 | Posted: 01-03-2022

Answer 15

A bit shorter, cleaner (and eagerly computed) version of the top answers:


The helper enum:

public enum OSType {
    Windows, MacOS, Linux, Other;
    public static final  OSType DETECTED;
        String OS = System.getProperty("", "generic").toLowerCase(Locale.ENGLISH);
        if ((OS.contains("mac")) || (OS.contains("darwin"))) {
            DETECTED = OSType.MacOS;
        } else if (OS.contains("win")) {
            DETECTED = OSType.Windows;
        } else if (OS.contains("nux")) {
            DETECTED = OSType.Linux;
        } else {
            DETECTED = OSType.Other;

Answered by: Alberta876 | Posted: 01-03-2022

Answer 16

I liked Wolfgang's answer, just because I believe things like that should be consts...

so I've rephrased it a bit for myself, and thought to share it :)

 * types of Operating Systems
 * please keep the note below as a pseudo-license
 * helper class to check the operating system this Java VM runs in
 * compare to
public enum OSType {
    MacOS("mac", "darwin"),

    private static OSType detectedOS;

    private final String[] keys;

    private OSType(String... keys) {
        this.keys = keys;

    private boolean match(String osKey) {
        for (int i = 0; i < keys.length; i++) {
            if (osKey.indexOf(keys[i]) != -1)
                return true;
        return false;

    public static OSType getOS_Type() {
        if (detectedOS == null)
            detectedOS = getOperatingSystemType(System.getProperty("", Other.keys[0]).toLowerCase());
        return detectedOS;

    private static OSType getOperatingSystemType(String osKey) {
        for (OSType osType : values()) {
            if (osType.match(osKey))
                return osType;
        return Other;

Answered by: Roland781 | Posted: 01-03-2022

Answer 17

You can just use sun.awt.OSInfo#getOSType() method

Answered by: Blake979 | Posted: 01-03-2022

Answer 18

This code for displaying all information about the system os type,name , java information and so on.

public static void main(String[] args) {
    // TODO Auto-generated method stub
    Properties pro = System.getProperties();
    for(Object obj : pro.keySet()){
        System.out.println(" System  "+(String)obj+"     :  "+System.getProperty((String)obj));

Answered by: Kellan979 | Posted: 01-03-2022

Answer 19

In com.sun.jna.Platform class you can find useful static methods like


and much more.

If you use Maven just add dependency


Otherwise just find jna library jar file (ex. jna-5.2.0.jar) and add it to classpath.

Answered by: Kimberly263 | Posted: 01-03-2022

Answer 20

Just use com.sun.javafx.util.Utils as below.

if ( Utils.isWindows()){
     // LOGIC HERE


boolean isWindows = OSInfo.getOSType().equals(OSInfo.OSType.WINDOWS);
       if (isWindows){
         // YOUR LOGIC HERE

Answered by: Madaline722 | Posted: 01-03-2022

Answer 21

Since google points "kotlin os name" to this page, here's the Kotlin version of @Memin 's answer:

private var _osType: OsTypes? = null
val osType: OsTypes
    get() {
        if (_osType == null) {
            _osType = with(System.getProperty("").lowercase(Locale.getDefault())) {
                if (contains("win"))
                else if (listOf("nix", "nux", "aix").any { contains(it) })
                else if (contains("mac"))
                else if (contains("sunos"))
        return _osType!!

enum class OsTypes {

Answered by: Edgar178 | Posted: 01-03-2022

Answer 22

For getting OS name, simply use:


Lets say you want to see if platform is linux:

if (Platform.getOS().equals(Platform.OS_LINUX)) {

Similarly Platform class have defined constants for others operating system names. Platform class is part of org.eclipse.core.runtime package.

Answered by: Rafael947 | Posted: 01-03-2022

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