Print or list all environment variables using java8 streams (example)

We will get list of all environment variables using System class.
We will iterate through the map of system variables using java8 streams.

1. Program – print all environment variables using java8 streams.

package org.learn;
 
import java.util.Map;
import java.util.Properties;
 
public class ListEnvironmentVariables {
    public static void main(String[] args) {
        Map<String, String> mapEnvVariables = System.getenv();
        System.out.println("Environment variables are as follows:");
        mapEnvVariables.forEach(
                        (key,value)
                              ->
                        System.out.println(key + " = " +value)
                );
    }
}

2. Output – list of all environment variables using java8 streams.

Environment variables are as follows:
CATALINE_HOME = E:\apache-tomcat-8.0.23
PROCESSOR_LEVEL = 6
FPS_BROWSER_APP_PROFILE_STRING = Internet Explorer
LOGONSERVER = \\BWIND-DC1
ACTIVATOR_HOME = E:\Software\activator-1.2.8-minimal
JAVA_HOME = C:\Program Files\Java\jdk1.8.0_101
SESSIONNAME = Console
ALLUSERSPROFILE = C:\ProgramData
PROCESSOR_ARCHITECTURE = AMD64
SystemDrive = C:
JETTY_HOME = E:\jetty-distribution-9.3.1.v20150714
USERNAME = admin
TOMCAT_HOME = E:\apache-tomcat-8.0.23
ProgramFiles(x86) = C:\Program Files (x86)
CommonProgramFiles = C:\Program Files\Common Files
Path = C:\ProgramData\Oracle\Java\javapath;C:\Windows\system32
FPS_BROWSER_USER_PROFILE_STRING = Default
PATHEXT = .COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC
OS = Windows_NT
COMPUTERNAME = 2YR1L72
PLAY2_HOME = E:\Software\activator-1.2.8-minimal
PROCESSOR_REVISION = 5e03
CommonProgramW6432 = C:\Program Files\Common Files
ComSpec = C:\Windows\system32\cmd.exe
UATDATA = C:\Windows\CCM\UATData\D9F8C395-CAB8-491d-B8AC-179A1FE1BE77
ProgramData = C:\ProgramData
SystemRoot = C:\Windows
HOMEDRIVE = C:
PROCESSOR_IDENTIFIER = Intel64 Family 6 Model 94 Stepping 3, GenuineIntel
CommonProgramFiles(x86) = C:\Program Files (x86)\Common Files
ProgramFiles = C:\Program Files
PUBLIC = C:\Users\Public
NUMBER_OF_PROCESSORS = 8
windir = C:\Windows