Suppose that a Java class A extends another class B, and implements interface If1. B extends the abstract class Ab and implements interface If2. (a) What are the requirements that A should meet, in terms of contracts with other classes and interfaces? (b) What are the requirements that B should meet, in terms of contracts with other classes and interfaces?
1
class B extends Ab implements If2
class A extends B implements If1
a)
class A should implement all the abstract methods of interface If1and all the abstract methods of class Ab and interface If2 which are not defined by class B.
b)
class B should implement all the abstract methods of abstract class Ab and interface If2.
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