How to configure java environment variables?

Steps to configure Java environment variables on Windows: 1. Download and install Java; 2. Find the Java installation directory; 3. Set the JAVA_HOME environment variable; 4. Modify the PATH environment variable; 5. Verify the configuration. Steps to configure Java environment variables on Unix/Linux: 1. Download and install Java; 2. Find the Java installation directory; 3. Set the JAVA_HOME environment variable; 4. Verify the configuration.

Operating system for this tutorial: Windows 10 system, Dell G3 computer.

When configuring Java environment variables, you need to set two main environment variables: JAVA_HOME and PATH. The following are the steps to configure Java environment variables on Windows and Unix/Linux systems:

Configure Java environment variables on Windows:

1. Download and install Java:

First, download and install the Java Development Kit (JDK) from the official website (https://www.oracle.com/java/technologies/javase-downloads.html) or other reliable channels.

2. Find the Java installation directory:

Remember the directory path where you installed Java, usually similar to C:\Program Files\Java\jdk1.x.x.

3. Set the JAVA_HOME environment variable:

• Right-click the computer (or this computer) and select "Properties".

• Click "Advanced System Settings".

• Under the "Advanced" tab, click the "Environment Variables" button.

• In the "System Variables" section, click "New".

• Variable name: JAVA_HOME, variable value: path to the Java installation directory (for example: C:\Program Files\Java\jdk1.x.x).

• Click "OK" to close the window.

4. Modify the PATH environment variable:

• In the "System Variables" section, find and select the "Path" variable, and click "Edit" .

• Add ; at the end of the variable value, and then add %JAVA_HOME%\bin.

• Click "OK" to save the changes.

5. Verify the configuration:

Open the command prompt (Command Prompt) and enter the following commands: java -version and javac -version. Make sure the correct Java version information is displayed.

Configure Java environment variables on Unix/Linux:

1. Download and install Java:

Use the package manager or download and install the Java Development Kit from the official website ( JDK).

2. Find the Java installation directory:

Remember the directory path where you installed Java, usually similar to /usr/lib/jvm/jdk1.x.x.

3. Set the JAVA_HOME environment variable:

Open the terminal window.

Edit the ~/.bashrc or ~/.bash_profile file and add the following line:

export JAVA_HOME=/usr/lib/jvm/jdk1.x.x
export PATH=$PATH:$JAVA_HOME/bin

Run source ~/.bashrc or source ~/.bash_profile to apply the changes.

4. Verify configuration:

Enter the following commands in the terminal: java -version and javac -version. Make sure the correct Java version information is displayed.

After this configuration, your system will be able to correctly identify and use Java.

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