如何调用静态类中存在的方法？

Question

I'm very new to Java programming and I have a doubt.

I have a program like this:

class A {

  static final class B {

       public int addMe() {
       }

  }

}

how do I call the method addMe ?

When I do ABaddme() I get an error.

Answer 1

addme() is an instance method of the inner class B. So you need a B instance to be able to call it:

A.B b = new A.B();
b.addme();

Answer 2

Your addMe() method is not static, so you can't call it without B class instances:

A.B b = new A.B();
b.addMe();

Answer 3

Typical java inner class (without static) can be initialized only inside the class it is declared in. A static inner class is actually a normal class, visible to any other class in the program, but declared in other class' file.

You have to instantiate the static class B and call the method or mark the method itself as static.