Get environment variables in Java

Environment variables are in the operating system and applications Program An important part of interaction. Getting or setting environment variables is a frequently used technology in programming. Here I reposted an article about how to get environment variables in Java. Article :
(Zz from http://www.javaidea.net/list.jsp? Topic = 3)

Set an environment variable debug to true at runtime: Java-ddebug = true yourclass
Set an environment variable debug to true in the program:System. setproperty ("debug", "true ");
Get an environment variable Debug:String DEBUG = system. getproperty ("debug ");

The following table lists some environment variables that have been defined by Java. getproperty ("key"). For more environment variables, see the JDK documentation.

Attribute name	Description
Java. Version	Java runtime version
Java. Home	Java installation directory
Java. Class. Version	Java version
Java. Class. Path	Java class search path
Java. Io. tmpdir	Default temporary directory
Java. Compiler	Timely compiler used by Java
Java. Ext. dirs	Java extension package directory
OS. Name	Operating system name
OS. Arch	Operating System Architecture
OS. Version	Operating system version
File. Separator	File separator ('/' in UNIX '/')
Path. Separator	Path separator (':' in UNIX ':')
Line. Separator	Line Break ('\ n' in UNIX ')
User. Name	User Account Name
User. Home	User directory
User. dir	Current working directory of the user