Java-system Properties, GetProperty, setproperty__properties

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

Tutorial/essential/environment/sysprop.html

Http://www.leepoint.net/notes-java/io/30properties_and_preferences/40sysprops/10sysprop.html

http://blog.csdn.net/szwangdf/article/details/4366581

System Properties:

The following table describes some of the most important system properties

Key	meaning
"File.separator"	Character that separates components of a file path. This is '/' on UNIX and \ ' on Windows.
"Java.class.path"	Path used to find directories and JAR archives containing class files. Elements of the class path are separated by a platform-specific character specified in the Path.separatorproperty.
"Java.home"	installation directory for Java Runtime environment (JRE)
"Java.vendor"	JRE Vendor Name
"Java.vendor.url"	JRE Vendor URL
"Java.version"	JRE Version number
"Line.separator"	Sequence used by operating system to separate lines in text files
"Os.arch"	Operating system architecture
"Os.name"	Operating system name
"Os.version"	Operating system version
"Path.separator"	Path separator character used in Java.class.path
"User.dir"	User working Directory
"User.home"	User Home Directory
"User.Name"	User account Name

Properties props=system.getproperties ();
System Properties System.out.println ("Java Running environment version:" +props.getproperty ("java.version"));
SYSTEM.OUT.PRINTLN ("Java Operating Environment provider:" +props.getproperty ("Java.vendor"));
System.out.println ("Java Vendor's URL:" +props.getproperty ("Java.vendor.url"));
System.out.println ("Java Installation path:" +props.getproperty ("Java.home"));
SYSTEM.OUT.PRINTLN ("Java Virtual machine spec version:" +props.getproperty ("java.vm.specification.version"));
SYSTEM.OUT.PRINTLN ("Java Virtual machine specification Vendor:" +props.getproperty ("Java.vm.specification.vendor"));
SYSTEM.OUT.PRINTLN ("Java Virtual machine Specification Name:" +props.getproperty ("Java.vm.specification.name"));
SYSTEM.OUT.PRINTLN ("Java Virtual Machine Implementation version:" +props.getproperty ("java.vm.version"));
SYSTEM.OUT.PRINTLN ("Java Virtual machine Implementation provider:" +props.getproperty ("Java.vm.vendor"));
SYSTEM.OUT.PRINTLN ("Java Virtual machine implementation name:" +props.getproperty ("Java.vm.name"));
System.out.println ("Java Runtime Environment Specification version:" +props.getproperty ("java.specification.version"));
System.out.println ("Java Runtime Environment Specification vendor:" +props.getproperty ("Java.specification.vender")); System.out.println ("JaVA run-time Environment Specification Name: "+props.getproperty (" Java.specification.name "));
System.out.println ("Java Class format version number:" +props.getproperty ("java.class.version"));
System.out.println ("Java classpath:" +props.getproperty ("Java.class.path"));
SYSTEM.OUT.PRINTLN ("List of paths to search when loading library:" +props.getproperty ("Java.library.path"));
SYSTEM.OUT.PRINTLN ("Default temporary file path:" +props.getproperty ("Java.io.tmpdir"));
SYSTEM.OUT.PRINTLN ("Path of one or more extended directories:" +props.getproperty ("Java.ext.dirs"));
System.out.println ("The name of the operating system:" +props.getproperty ("Os.name"));
SYSTEM.OUT.PRINTLN ("Architecture of the Operating system:" +props.getproperty ("Os.arch"));
SYSTEM.OUT.PRINTLN ("Operating system version:" +props.getproperty ("os.version"));   System.out.println ("File separator:" +props.getproperty ("File.separator"));   In Unix system is "/" System.out.println ("Path separator:" +props.getproperty ("Path.separator"));   In Unix systems is ":" System.out.println ("line delimiter:" +props.getproperty ("Line.separator"));
In Unix system is "n" System.out.println ("User's account name:" +props.getproperty ("User.Name"));
System.out.println ("User's home directory:" +props.getproperty ("User.home")); System.out. println ("User's current working directory:" +props.getproperty ("User.dir"));