To compile and run Java 17 code using the command line, follow these steps:

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1. Install Java 17

• Ensure that Java 17 is installed on your system.
• Run the following command to check the installed Java version:

java -version

If Java 17 is not installed, download and install it from the official Oracle website or use OpenJDK.

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2. Write Your Java Code

• Create a Java file with the .java extension. For example, create a file named HelloWorld.java with the following content:

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

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3. Open Command Line

• Open a terminal (on Linux/Mac) or Command Prompt/PowerShell (on Windows).

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4. Navigate to the Directory

• Go to the directory where the .java file is located using the cd command. For example:

cd /path/to/your/code

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5. Compile the Java File

• Use the javac command to compile the .java file into bytecode. The javac compiler will create a .class file.

javac HelloWorld.java

• If there are no errors, you’ll see a file named HelloWorld.class in your directory.

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6. Run the Compiled Java File

• Execute the compiled .class file using the java command (without the .class extension):

java HelloWorld

• You should see the following output:

Hello, World!

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7. (Optional) Use Java 17 Specific Features

• Java 17 brought several new features such as sealed classes, pattern matching for switch, and more. Make sure your code uses features specific to Java 17 to fully utilize it.

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Common Troubleshooting

1. 'javac' is not recognized as an internal or external command:
   • Ensure Java is added to your system’s PATH environment variable. Refer to your operating system’s documentation to add the Java bin directory to the PATH.
2. Specify Java Version (if multiple versions are installed):
   • Use the full path to the desired Java version for compilation and execution:

/path/to/java17/bin/javac HelloWorld.java
/path/to/java17/bin/java HelloWorld

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With these steps, your Java 17 code should successfully compile and run from the command line.