static methods

[nimo frey]

I have two classes, class A accesses a method of class B.

What alternatives do I have for accessing methods of other classes?

One alternative are static methods:

class A{

// static access
B.doThis();

}

class B{

static void doThis(){

// now, I want to invoke a method within class B
B.doThat();

static void doThat();
}

}

Is this a common (better) way for accessing methods, which I want to provide to other classes? Or is there a better way?

for example, instantiate class B within class A:

class A{

B b = new B();

// non-static access
b.doThis();

}

Or via Interface?

What approach is better? What do I have to note?

[Venkata Kumar]

If you want to access only static methods of class B you don't need to instantiate an object of B in class A.
Interfaces can't have static methods. Interface can be used to access the non-static methods of a class.

[nimo frey]

Interfaces can't have static methods. Interface can be used to access the non-static methods of a class.

So if I provide a interface, then I need to instantiate the interface, when wanting to access its declared methods?

[David Newton]

You'd instantiate an implementation of an interface to access its non-static methods.

[nimo frey]

ahh. got it. okay, thank you!