why main method in Java need to be public always? [duplicate]

Answer 1

because main method is gateway, from where your project can be access. If you make private this main gateway to your application then accessibility of functionality is not possible.

Answer 2

static so that the JVM can run the method without having to instantiate the class object + public so that the JVM can access it freely without any access issues.

Answer 3

It is specified by the Java Language Specification, see http://docs.oracle.com/javase/specs/jls/se7/html/jls-12.html chapter 12.1.4. Invoke Test.main:

The method main must be declared public, static, and void.

It is also required by the JVM specification, see the answer from @A4L.

Answer 4

I think it is just a rule in the Java language.
Technically I don't see another reason (because even if
it's not public the JVM can still find it and call it).

Answer 5

If no modifier (e.g., public) is used then only the class and the package can run the method. This means that the outside world can't run the main method. That, in turn, is why you need to define the method with public.

Answer 6

Main method has to strictly follow its syntax; other wise JVM will not be able to locate it and your program will not run.

They are public because they must be accessible to the JVM to begin execution of the program.If it is not public then only the class and the package members can access it and JVM cannot.

Main is the first method that would get executed in any class. They are static because they must be available for execution without an object instance.