How to use classless main methods in Java 25

In Java 25, you can take advantage of the classless main method, allowing you to write short and simple programs without needing to wrap them in a class declaration. This feature is designed to make Java more approachable, especially for quick scripting or beginner-friendly coding introductions.

How to Use Classless Main Methods

1. Create a Java file:
   Simply start with a .java file, skipping the need for a class declaration. Declare a void main() function as your entry point.

   Example:

   void main() {
      System.out.println("Hello, Java 25!");
   }
   

2. Run the file:
   Compile and run the program directly using the java command. Java 25 interprets this as an entry-point method.

   java Hello.java
   

3. Output:
   The program will execute, and you’ll see the result printed into the terminal:

   Hello, Java 25!
   

Key Details of Classless Main Methods

• No public class wrapper needed:
  There’s no need to define a class or include access modifiers like public.

• Focus on simplicity:
  This syntax makes it easier to write short utility scripts or test snippets without boilerplate.

• Direct script execution:
  Java 25 allows you to directly execute .java files without manually compiling (javac).

Use Cases

• Learning Java: Ideal for beginners who want to experiment with Java quickly, without worrying about object-oriented concepts initially.
• Script Writing: Great for quick scripts, prototyping, or throwaway Java programs.
• Debugging and One-Liners: Use it to test small snippets or explore functionality without creating entire project structures.

Java 25 is continuing to evolve into a flexible language both for large enterprise systems and small-scale scripting needs with minimal setup.