Detecting Windows or Linux?

I am seeking to run a common Java program in both Windows and Linux.

The program needs to do some things differently on each platform.

So how can / should my Java program detect it is running under Linux vs. Windows?

apache commons lang has a class SystemUtils.java you can use :

SystemUtils.IS_OS_LINUX
SystemUtils.IS_OS_WINDOWS

Try:

System.getProperty("os.name");

http://docs.oracle.com/javase/7/docs/api/java/lang/System.html#getProperties%28%29

you can use this Useful simple class:

public class OSValidator {
 
	private static String OS = System.getProperty("os.name").toLowerCase();
 
	public static void main(String[] args) {
 
		System.out.println(OS);
 
		if (isWindows()) {
			System.out.println("This is Windows");
		} else if (isMac()) {
			System.out.println("This is MacOS");
		} else if (isUnix()) {
			System.out.println("This is Unix or Linux");
		} else if (isSolaris()) {
			System.out.println("This is Solaris");
		} else {
			System.out.println("Your OS is not supported!!");
		}
	}
 
	public static boolean isWindows() {
		return OS.contains("win");
	}
 
	public static boolean isMac() {
		return OS.contains("mac");
	}
 
	public static boolean isUnix() {
		return (OS.contains("nix") || OS.contains("nux") || OS.contains("aix"));
	}
 
	public static boolean isSolaris() {
		return OS.contains("sunos");
	}

	public static String getOS(){
		if (isWindows()) {
			return "win";
		} else if (isMac()) {
			return "osx";
		} else if (isUnix()) {
			return "uni";
		} else if (isSolaris()) {
			return "sol";
		} else {
			return "err";
		}
	}
	
}

I think It's a best approach to use Apache lang dependency to decide which OS you're running programmatically through Java

import org.apache.commons.lang3.SystemUtils;

public class App {
    public static void main( String[] args ) {
    	if(SystemUtils.IS_OS_WINDOWS_7)
    		System.out.println("It's a Windows 7 OS");
    	if(SystemUtils.IS_OS_WINDOWS_8)
    		System.out.println("It's a Windows 8 OS");
    	if(SystemUtils.IS_OS_LINUX)
    		System.out.println("It's a Linux OS");
    	if(SystemUtils.IS_OS_MAC)
    		System.out.println("It's a MAC OS");
    }
}

You can use "system.properties.os", for example:

public class GetOs {

  public static void main (String[] args) {
    String s = 
      "name: " + System.getProperty ("os.name");
    s += ", version: " + System.getProperty ("os.version");
    s += ", arch: " + System.getProperty ("os.arch");
    System.out.println ("OS=" + s);
  }
}

// EXAMPLE OUTPUT: OS=name: Windows 7, version: 6.1, arch: amd64

Here are more details:

• http://docs.oracle.com/javase/tutorial/essential/environment/sysprop.html