Unpacking the Secret Behind Java 25's Simple main()

For Years Java Developers had to write

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

Miss one and your code wouldn’t run.

But in java 25, It just changed now , running a method is as siimple as write just a main() method

 example.java
 main()  {
  IO.println("Hello Java");
 }

Yes this is valid , But In Java we need a class to run the code ? What happened to all the keywords - public static void ? what happened to the method arguments - main(String[] args)?

• you can run java programs without compiling first javac example.java What this will do is compile the code on the fly and run the generated class. In Java 25 code the compiler still adds the class even though you did not create
  class compiler creates one for you to run your main() method

• instance main method : what this means is now java main method can be a part of Object. you don’t require the static keyword to make it part of the class Java Launcher i.e javac or java can run the main() method .

• java still needs the main() - this is still then entry point of the program now you dont require the method arguments

  main() 
  main(String[] args)
  ``
  Both are valid syntaxes
  

you can inspect the bytecode of your generated classfile using javap command you will see that

Compiled from "example.java"
final class example {
  example();
  void main();
}

the class with the java filename and the constructor is added by the compiler as you can see.