How Java determines whether the operating system is Linux or Windows__linux

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String OS = System.getproperty ("Os.name");
if (Os.tolowercase (). StartsWith ("Win")) {
System.out.println (OS + "can ' t gunzip");
}

System class

public static Properties getProperties()

Returns the current set of system properties that the GetProperty (String) method uses as a Properties object

Description of key-related values

Java.version	Java Runtime Environment version
Java.vendor	Java Runtime Environment Vendor
Java.vendor.url	URLs for Java Vendors
Java.home	Java installation directory
Java.vm.specification.version	Java Virtual Machine Spec version
Java.vm.specification.vendor	Java Virtual Machine Specification Vendor
Java.vm.specification.name	Java Virtual Machine Specification Name
Java.vm.version	Java Virtual Machine Implementation version
Java.vm.vendor	Java Virtual Machine Implementation Provider
Java.vm.name	Java Virtual Machine Implementation name
Java.specification.version	Java Runtime Environment Specification version
Java.specification.vendor	Java Runtime Environment Specification vendor
Java.specification.name	Java Runtime Environment Specification name
Java.class.version	Java Class Format version number
Java.class.path	Java class Path
Java.library.path	List of paths to search when loading libraries
Java.io.tmpdir	Default temporary file path
Java.compiler	The name of the JIT compiler to use
Java.ext.dirs	Path to one or more extended directories
Os.name	The name of the operating system
Os.arch	The architecture of the operating system
Os.version	Version of the operating system
File.separator	File delimiter (in UNIX system is "/")
Path.separator	Path separator (in UNIX system is ":")
Line.separator	Row delimiter (in UNIX system is "n")
User.Name	User's account name
User.home	User's home directory
User.dir	User's current working directory