Sunday, October 3, 2010

Determine user details from a Java program

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 Virtual Machine specification name
java.vm.version Java Virtual Machine implementation version
java.vm.vendor Java Virtual Machine implementation vendor Java Virtual Machine implementation name
java.specification.version Java Runtime Environment specification version
java.specification.vendor Java Runtime Environment specification vendor 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 Default temp file path
java.compiler Name of JIT compiler to use
java.ext.dirs Path of extension directory or directories 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'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

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



Srishti Dubey on February 27, 2012 at 11:05 PM said...

Hello.... informative read.. being enrolled in a JAVA programming course @ I was looking for such material on the net to boost up my preparation.. thanks :)

Abiya Carol on January 27, 2017 at 4:32 AM said...

A constructor has same name as the class in which it resides. Constructor in Java can not be abstract, static, final or synchronized. These modifiers are not allowed for constructor.

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