== is an operator. equals is a method defined in the Object class
== checks if two objects have the same address in the memory and for primitive it checks if they have the same value.equals method on the other hand checks if the two objects which are being compared have an equal value(depending on how ofcourse the equals method has been implemented for the objects. equals method cannot be applied on primitives(which means that
if a is a primitive a.equals(someobject) is not allowed, however someobject.equals(a) is allowed).
