Java System.getProperties() on various platforms

Here is a handy comparison of Java System.getProperties() on various platforms, in case you are ever trying to detect what OS you are running on.  What is interesting is how Android reports itself as Linux, but it looks like there are some other candidate properties that will give you a clue that it is Android.

Windows 7	Linux	Android
file.encoding.pkg=sun.io file.encoding=ANSI_X3.4-1968 file.separator=/ java.awt.graphicsenv=sun.awt.X11GraphicsEnvironment java.awt.printerjob=sun.print.PSPrinterJob java.class.path=./bin:./lib/jmxtools.jar:./lib/common... java.class.version=49.0 java.endorsed.dirs=/usr/java/jre1.5.0_06/lib/endorsed java.ext.dirs=/usr/java/jre1.5.0_06/lib/ext java.home=/usr/java/jre1.5.0_06 java.io.tmpdir=/tmp java.library.path=/usr/java/jre1.5.0_06/lib/i386/client... java.runtime.name=Java(TM) 2 Runtime Environment, Stand... java.runtime.version=1.5.0_06-b05 java.specification.name=Java Platform API Specification java.specification.vendor=Sun Microsystems Inc. java.specification.version=1.5 java.vendor.url.bug=http://java.sun.com/cgi-bin/bugreport... java.vendor.url=http://java.sun.com/ java.vendor=Sun Microsystems Inc. java.version=1.5.0_06 java.vm.info=mixed mode java.vm.name=Java HotSpot(TM) Client VM java.vm.specification.name=Java Virtual Machine Specification java.vm.specification.vendor=Sun Microsystems Inc. java.vm.specification.version=1.0 java.vm.vendor=Sun Microsystems Inc. java.vm.version=1.5.0_06-b05 line.separator= os.arch=i386 os.name=Linux os.version=2.4.21-37.ELsmp path.separator=: sun.arch.data.model=32 sun.boot.class.path=./lib/mx4j.jar:./lib/mx4j-remote.jar:... sun.boot.library.path=/usr/java/jre1.5.0_06/lib/i386 sun.cpu.endian=little sun.cpu.isalist= sun.io.unicode.encoding=UnicodeLittle sun.jnu.encoding=ANSI_X3.4-1968 sun.management.compiler=HotSpot Client Compiler sun.os.patch.level=unknown user.country=US user.dir=/root/proto/sa user.home=/root user.language=en user.name=root user.timezone=America/Los_Angeles	file.encoding.pkg=sun.io file.encoding=ANSI_X3.4-1968 file.separator=/ java.awt.graphicsenv=sun.awt.X11GraphicsEnvironment java.awt.printerjob=sun.print.PSPrinterJob java.class.path=./bin:./lib/jmxtools.jar:./lib/common... java.class.version=49.0 java.endorsed.dirs=/usr/java/jre1.5.0_06/lib/endorsed java.ext.dirs=/usr/java/jre1.5.0_06/lib/ext java.home=/usr/java/jre1.5.0_06 java.io.tmpdir=/tmp java.library.path=/usr/java/jre1.5.0_06/lib/i386/client... java.runtime.name=Java(TM) 2 Runtime Environment, Stand... java.runtime.version=1.5.0_06-b05 java.specification.name=Java Platform API Specification java.specification.vendor=Sun Microsystems Inc. java.specification.version=1.5 java.vendor.url.bug=http://java.sun.com/cgi-bin/bugreport... java.vendor.url=http://java.sun.com/ java.vendor=Sun Microsystems Inc. java.version=1.5.0_06 java.vm.info=mixed mode java.vm.name=Java HotSpot(TM) Client VM java.vm.specification.name=Java Virtual Machine Specification java.vm.specification.vendor=Sun Microsystems Inc. java.vm.specification.version=1.0 java.vm.vendor=Sun Microsystems Inc. java.vm.version=1.5.0_06-b05 line.separator= os.arch=i386 os.name=Linux os.version=2.4.21-37.ELsmp path.separator=: sun.arch.data.model=32 sun.boot.class.path=./lib/mx4j.jar:./lib/mx4j-remote.jar:... sun.boot.library.path=/usr/java/jre1.5.0_06/lib/i386 sun.cpu.endian=little sun.cpu.isalist= sun.io.unicode.encoding=UnicodeLittle sun.jnu.encoding=ANSI_X3.4-1968 sun.management.compiler=HotSpot Client Compiler sun.os.patch.level=unknown user.country=US user.dir=/root/proto/sa user.home=/root user.language=en user.name=root user.timezone=America/Los_Angeles	android.icu.library.version = 4.8.1.1 android.icu.unicode.version = 6.0 android.openssl.version = OpenSSL 1.0.1c 10 May 2012 android.zlib.version = 1.2.6.f-codeaurora-mods-v1 file.encoding = UTF-8 file.separator = / http.agent = Dalvik/1.6.0 (Linux; U; Android 4.1.2; SAMSUNG-SGH-I547 Build/JZO54K) java.boot.class.path = /system/framework/core.jar:... java.class.path = . java.class.version = 50.0 java.compiler = java.ext.dirs = java.home = /system java.io.tmpdir = /data/data/com.demo.android.simple/cache java.library.path = /vendor/lib:/system/lib java.runtime.name = Android Runtime java.runtime.version = 0.9 java.specification.name = Dalvik Core Library java.specification.vendor = The Android Project java.specification.version = 0.9 java.vendor = The Android Project java.vendor.url = http://www.android.com/ java.version = 0 java.vm.name = Dalvik java.vm.specification.name = Dalvik Virtual Machine Specification java.vm.specification.vendor = The Android Project java.vm.specification.version = 0.9 java.vm.vendor = The Android Project java.vm.vendor.url = http://www.android.com/ java.vm.version = 1.6.0 line.separator = os.arch = armv7l os.name = Linux os.version = 3.0.31-1371191 path.separator = : user.dir = / user.home = user.language = en user.name = user.region = US