When we want to get details of the host pc from a Java program , we can use the getProperty() method of System class in java.lang package. According to the java documentation(SE6) we can get following information using this class.

Key	Description of Associated Value
java.version	Java Runtime Environment version
java.vendor	Java Runtime Environment vendor
java.vendor.url	Java vendor URL
java.home	Java installation directory
java.vm.specification.version	Java Virtual Machine specification 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 vendor
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 temp file path
java.compiler	Name of JIT compiler to use
java.ext.dirs	Path of extension directory or directories
os.name	Operating system name
os.arch	Operating system architecture
os.version	Operating system version
file.separator	File separator ("/" on UNIX)
path.separator	Path separator (":" on UNIX)
line.separator	Line separator ("\n" on UNIX)
user.name	User's account name
user.home	User's home directory
user.dir	User's current working directory

I have written a Java class to encapsulate these data. lets see the class and a sample program.

class UserInfo

//© http://imagocomputing.blogspot.com/

class UserInfo {
 private String getInfo(String key){
  return System.getProperty(key);
 }

 public String getVersion(){
  return getInfo("java.version");
 } 

 public String getJavaHome(){
  return getInfo("java.home");
 } 

 public String getTempDir(){
  return getInfo("java.home");
 } 

 public String getOS(){
  return getInfo("os.name");
 } 

 public String getOSVer(){
  return getInfo("os.version");
 } 

 public String getUserName(){
  return getInfo("user.name");
 } 

 public String getUserHome(){
  return getInfo("user.home");
 } 

 public String getfileSeperator(){
  return getInfo("file.separator");
 }
}

class UserInfoTest

class UserInfoTest {
 public static void main(String args[]){
  UserInfo useInf=new UserInfo();
  System.out.println("JRE Version \t: "+useInf.getVersion());
  System.out.println("JRE Directory \t: "+useInf.getJavaHome());
  System.out.println("JRE Temp Dir \t: "+useInf.getTempDir());
  System.out.println("OS Name \t: "+useInf.getOS());
  System.out.println("OS version \t: "+useInf.getOSVer());
  System.out.println("User Name \t: "+useInf.getUserName());
  System.out.println("User Home \t: "+useInf.getOSVer());
  System.out.println("File Seperator \t: "+useInf.getfileSeperator());
 }
}

Output: