Java

Installing OpenJDK on macOS

To set up OpenJDK on a macOS system, follow these steps:

1. Install OpenJDK with Homebrew:

   brew install openjdk

2. Create a symbolic link:

   • Establish a link to make Java accessible system-wide.

   sudo ln -sfn /opt/homebrew/opt/openjdk/libexec/openjdk.jdk /Library/Java/JavaVirtualMachines/openjdk.jdk

3. Update the PATH environment variable:

   • Ensure the OpenJDK binaries are prioritized when executing Java commands.

   echo 'export PATH="/opt/homebrew/opt/openjdk/bin:$PATH"' >> ~/.zshrc

4. Set C++ flags:

   • This is necessary if you're compiling C++ programs that interact with Java.

   export CPPFLAGS="-I/opt/homebrew/opt/openjdk/include"

After these steps, restart your terminal or run source ~/.zshrc to apply the changes.

To compile and run a simple Java program, follow these steps

1. Create a Java file named Main.java with the following content:

   public class Main {
       public static void main(String[] args) {
           System.out.println("Hello, World!");
       }
   }

2. Open a terminal and navigate to the directory containing Main.java.

3. Compile the Java program:

   javac Main.java

4. Run the compiled Java program:

   java Main

Ensure the file is saved with the correct syntax to prevent errors.

Compile and Run a JavaFX Application on Mac

To compile and run a JavaFX application on Mac, ensure the filename matches the public class name.

Compile:

javac --module-path "./javafx-sdk-23.0.2/lib/" --add-modules javafx.controls,javafx.fxml [YourJavaFile].java

Run:

java --module-path "./javafx-sdk-23.0.2/lib/" --add-modules javafx.controls,javafx.fxml [YourJavaFile]

Replace [YourJavaFile] with the name of your Java