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Programming With Java

This guide provides step-by-step instructions to install Java on Windows, Linux, and macOS.

Windows Installation​

1. Download Java​

  • Visit the official Java download page.
  • Under Java SE (Standard Edition), select the latest JDK version (e.g., JDK 20).
  • Click on the Windows installer link (.exe).

2. Run the Installer​

  • Double-click the .exe file to start the installation.
  • Follow the prompts, leaving the default settings as they are. Click Next until the installation begins.

3. Set Up Environment Variables​

  • Right-click on This PC or Computer and select Properties.
  • Click on Advanced system settings > Environment Variables.
  • Under System variables, click New and set JAVA_HOME to the path of the Java installation directory (e.g., C:\Program Files\Java\jdk-20).
  • Edit the Path variable and add %JAVA_HOME%\bin.

4. Verify Installation​

  • Open the Command Prompt.
  • Type java -version and press Enter. The Java version should be displayed.

Linux Installation​

1. Download Java​

2. Install Java​

  • Open the Terminal and navigate to the downloaded file's directory.
  • Extract the file with: 
    tar -xvzf jdk-20_linux-x64_bin.tar.gz
  • Move the extracted folder to /opt: 
    sudo mv jdk-20 /opt/
  • Set up JAVA_HOME by adding the following to .bashrc or .bash_profile: 
    export JAVA_HOME=/opt/jdk-20
    export PATH=$JAVA_HOME/bin:$PATH
  • Apply the changes with: 
    source ~/.bashrc

3. Verify Installation​

  • Open a new Terminal window.
  • Type java -version and press Enter. The Java version should be displayed.

macOS Installation​

1. Download Java​

2. Install Java​

  • Double-click the .dmg file and follow the installation prompts.
  • Set up JAVA_HOME:
    • Open Terminal and run: 
      /usr/libexec/java_home -V
    • Copy the JDK path and add the following to .zshrc, .bash_profile, or .zprofile: 
      export JAVA_HOME=$(/usr/libexec/java_home -v <jdk_version>)
      export PATH=$JAVA_HOME/bin:$PATH
    • Replace <jdk_version> with the version number you installed.
    • Apply the changes with: 
      source ~/.zshrc  # or source ~/.bash_profile

3. Verify Installation​

  • Open Terminal.
  • Type java -version and press Enter. The Java version should be displayed.

Note: These steps should ensure Java is installed and ready to use on your system.

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