What are the two environment variables that must be set in order to run any Java programs?

The PATH and CLASSPATH are the two most important environment variables of the Java environment which are used to find the JDK binaries used to compile and run Java in windows and Linux and class files which are compiled Java bytecodes.

What are the environment variables to set for Java?

16 Answers

  • JAVA_HOME : C:Program FilesJavajdk1.8.0_112.
  • JRE_HOME : %JAVA_HOME%jre.
  • CLASSPATH : .;%JAVA_HOME%lib;%JAVA_HOME%jrelib.

What environment variables do we need to set to a machine in order to be able to run Java programs choose all that apply?

Before running Java programs on your machine you need to set two environment variables namely, PATH − The path environment variable is used to specify the set of directories which contains execution programs.

What files are needed to set environment variables?

Users can, and often do, augment them in the profile script for the command shell they are using. In Microsoft Windows, each environment variable’s default value is stored in the Windows registry or set in the AUTOEXEC. BAT file.

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What is setting environment variables?

An environment variable is a variable whose value is set outside the program, typically through functionality built into the operating system or microservice. An environment variable is made up of a name/value pair, and any number may be created and available for reference at a point in time.

How do I set environment variables in Java Windows 10?


  1. Download or save the appropriate JDK version for Windows. …
  2. Right-click the Computer icon on your desktop and select Properties.
  3. Click Advanced system settings.
  4. Click Environment variables.
  5. Under User variables, click New.
  6. Enter JAVA_HOME as the variable name.
  7. Enter the path to the JDK as the variable value.

What are environment variables in Linux?

In Linux and Unix based systems environment variables are a set of dynamic named values, stored within the system that are used by applications launched in shells or subshells. … Environment variables allow you to customize how the system works and the behavior of the applications on the system.

How do I set environment variables in Linux?

To make an environment persistent for a user’s environment, we export the variable from the user’s profile script.

  1. Open the current user’s profile into a text editor. vi ~/.bash_profile.
  2. Add the export command for every environment variable you want to persist. export JAVA_HOME=/opt/openjdk11.
  3. Save your changes.

How do I set environment variables in Ubuntu?

To permanently add a new environment variable in Ubuntu (tested only in 14.04), use the following steps:

  1. Open a terminal (by pressing Ctrl Alt T )
  2. sudo -H gedit /etc/environment.
  3. Type your password.
  4. Edit the text file just opened: …
  5. Save it.
  6. Once saved, logout and login again.
  7. Your required changes are made.
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Where are environment variables set?

Create and Modify Environment Variables on Windows

  1. On the Windows taskbar, right-click the Windows icon and select System.
  2. In the Settings window, under Related Settings, click Advanced system settings. …
  3. On the Advanced tab, click Environment Variables. …
  4. Click New to create a new environment variable.

What is an environment variable in C?

Environment variable is a global variable that can affect the way the running process will behave on the system.

How do I set environment variables in Mac?

From http://hathaway.cc/post/69201163472/how-to-edit-your-path-environment-variables-on-mac:

  1. Open Terminal.
  2. Run touch ~/.bash_profile; open ~/.bash_profile.
  3. In TextEdit, add export PATH=”$HOME/.rbenv/bin:$PATH”
  4. Save the . bash_profile file and Quit (Command + Q) Text Edit.
  5. Run source ~/.bash_profile.

How do you use environment variables?

Setting environment variables in windows take a more graphical approach. Go to Control PanelSystem and SecuritySystem and in the left panel, click on Advanced system settings . A popup dialog appears, click on environment variables. In the popup that appears, there are two sections.

What are environment variables in node JS?

Environment Variables are variables that are set by the Operating System. They are decoupled from application logic. They can be accessed from applications and programs through various APIs. There is a Node. js library called dotenv that helps you manage and load environment variables.

Why are environment variables useful?

Environment variables are helpful because they allow you to change which of your environments use which third party service environment by changing an API key, endpoint, or whatever the service uses to distinguish between environments.