When you declare a method as abstract method? Can I call a abstract method from a non abstract method?

Answer: A method without body is called abstract method. A abstract method can be called from a non abstract class or method provided it is inherited using a subclass.

Explanation:

An abstract method is a method which does not have a body, it just has opening and closing curly braces. A class having an abstract method is also declared as abstract class. We cannot make an object of the abstract class.

example : public abstract float multiply (float x, float y);

is an example of abstract method.

calling an abstract method from a non abstract method is possible provided it is inherited by a non abstract subclass.