How to Execute the Java Program

To execute a Java program, follow these steps:

1. Write the Java Code:

• Create a file with a .java extension, e.g., MyProgram.java.
• Ensure the class name matches the file name (case-sensitive) and includes a main method. Example:
  java public class MyProgram { public static void main(String[] args) { System.out.println("Hello, World!"); } }

1. Install Java:

• Ensure the Java Development Kit (JDK) is installed. Check by running java -version and javac -version in a terminal or command prompt.
• If not installed, download and install the JDK from Oracle or use an open-source version like OpenJDK.

1. Compile the Program:

• Open a terminal or command prompt.
• Navigate to the directory containing your .java file using cd path/to/directory.
• Compile the code using the javac command:
  javac MyProgram.java
• This generates a .class file (e.g., MyProgram.class) if there are no errors.

1. Run the Program:

• Execute the compiled program using the java command:
  java MyProgram
• Note: Do not include the .class extension in the command.
• The program’s output (e.g., Hello, World!) will appear in the terminal.

1. Handle Errors (if any):

• Compilation errors: Check the code for syntax issues (e.g., missing semicolons, incorrect class name).
• Runtime errors: Ensure the class name matches the file name, and the .class file exists.
• Environment issues: Verify the JDK is correctly installed and the JAVA_HOME environment variable is set if needed.

1. Optional – Use an IDE:

• Tools like IntelliJ IDEA, Eclipse, or VS Code simplify writing, compiling, and running Java programs with built-in buttons or commands (e.g., “Run” button).

If your program uses external libraries or packages, ensure they’re included in the classpath during compilation and execution (e.g., javac -cp . MyProgram.java and java -cp . MyProgram).