• Menu
  • Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar

JavaBeat

Java Tutorial Blog

  • Java
    • Java 7
    • Java 8
    • Java EE
    • Servlets
  • Spring Framework
    • Spring Tutorials
    • Spring 4 Tutorials
    • Spring Boot
  • JSF Tutorials
  • Most Popular
    • Binary Search Tree Traversal
    • Spring Batch Tutorial
    • AngularJS + Spring MVC
    • Spring Data JPA Tutorial
    • Packaging and Deploying Node.js
  • About Us
    • Join Us (JBC)
  • Java
    • Java 7
    • Java 8
    • Java EE
    • Servlets
  • Spring Framework
    • Spring Tutorials
    • Spring 4 Tutorials
    • Spring Boot
  • JSF Tutorials
  • Most Popular
    • Binary Search Tree Traversal
    • Spring Batch Tutorial
    • AngularJS + Spring MVC
    • Spring Data JPA Tutorial
    • Packaging and Deploying Node.js
  • About Us
    • Join Us (JBC)

How To Display Environment Variables In Java

January 31, 2014 //  by Krishna Srinivasan//  Leave a Comment

If you call getenv() method in the class System, it will return the map containing all the environment variables configured in your system. If you just iterate the map, it will display all the details. This example shows the simple program to print the environment variables. I have executed this example in the Ubuntu Linux OS, but it will work in all the platform. I have used TreeMap to sort the order of the listing.

EnvironmentVariablesExample.java

package javabeat.net.core;

import java.util.Map;
import java.util.Set;
import java.util.SortedMap;
import java.util.TreeMap;

public class EnvironmentVariablesExample {
	public static void main(String[] args) {
		Map<String, String> environmentMap = System.getenv();
		SortedMap<String, String> sortedEnvMap = new TreeMap<String, String>(environmentMap);
		Set<String> keySet = sortedEnvMap.keySet();
		for (String key : keySet) {
			String value = environmentMap.get(key);
			System.out.println("[" + key + "] " + value);
		}
	}
}

Output…

[COMPIZ_CONFIG_PROFILE] ubuntu
[DBUS_SESSION_BUS_ADDRESS] unix:abstract=/tmp/dbus-ihV3MTXDtR,guid=9dd6a750057413f91d1e961d00000093
[DEFAULTS_PATH] /usr/share/gconf/ubuntu.default.path
[DESKTOP_SESSION] ubuntu
[DISPLAY] :0.0
[GDMSESSION] ubuntu
[GNOME_DESKTOP_SESSION_ID] this-is-deprecated
[GNOME_KEYRING_CONTROL] /tmp/keyring-x4RXST
[GNOME_KEYRING_PID] 1941
[GPG_AGENT_INFO] /tmp/keyring-x4RXST/gpg:0:1
[GTK_MODULES] canberra-gtk-module:canberra-gtk-module
[HOME] /home/krishna
[LANG] en_IN
[LANGUAGE] en_IN:en
[LD_LIBRARY_PATH] /usr/lib/jvm/java-6-openjdk-i386/jre/lib/i386/server:/usr/lib/jvm/java-6-openjdk-i386/jre/lib/i386:/usr/lib/jvm/java-6-openjdk-i386/jre/../lib/i386:/usr/lib/jvm/java-6-openjdk-i386/jre/lib/i386/client:/usr/lib/jvm/java-6-openjdk-i386/jre/lib/i386:
[LOGNAME] krishna
[MANDATORY_PATH] /usr/share/gconf/ubuntu.mandatory.path
[PATH] /usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
[PWD] /home/krishna
[SESSION_MANAGER] local/krishna-desktop:@/tmp/.ICE-unix/1952,unix/krishna-desktop:/tmp/.ICE-unix/1952
[SHELL] /bin/bash
[SSH_AGENT_PID] 1990
[SSH_AUTH_SOCK] /tmp/keyring-x4RXST/ssh
[UBUNTU_MENUPROXY] libappmenu.so
[USER] krishna
[XAUTHORITY] /home/krishna/.Xauthority
[XDG_CONFIG_DIRS] /etc/xdg/xdg-ubuntu:/etc/xdg
[XDG_CURRENT_DESKTOP] Unity
[XDG_DATA_DIRS] /usr/share/ubuntu:/usr/share/gnome:/usr/local/share/:/usr/share/
[XDG_SEAT_PATH] /org/freedesktop/DisplayManager/Seat0
[XDG_SESSION_COOKIE] 668183e0288a5cca221ebab100000007-1391125112.629260-1060816248
[XDG_SESSION_PATH] /org/freedesktop/DisplayManager/Session0

Category: JavaTag: Java System Programming

About Krishna Srinivasan

He is Founder and Chief Editor of JavaBeat. He has more than 8+ years of experience on developing Web applications. He writes about Spring, DOJO, JSF, Hibernate and many other emerging technologies in this blog.

Previous Post: « How To Set Default Locale In Java
Next Post: Request Dispatcher In Servlet »

Reader Interactions

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Primary Sidebar

Follow Us

  • Facebook
  • Pinterest

FEATURED TUTORIALS

New Features in Spring Boot 1.4

Difference Between @RequestParam and @PathVariable in Spring MVC

What is new in Java 6.0 Collections API?

The Java 6.0 Compiler API

Introductiion to Jakarta Struts

What’s new in Struts 2.0? – Struts 2.0 Framework

JavaBeat

Copyright © by JavaBeat · All rights reserved
Privacy Policy | Contact