This are Java questions do all

A class that uses an interface must use the keyword: (a) Extends (b) Inherits (c) Super (d) Implements An interface and all of its method headings are normally declared to be: (a) public (b) private (c) protected (d) package access In Java, a derived class can have _______ base class(es). (a) one (b) two (c) three (d) there A class that implements an interface but only gives definitions for some of the method headings given in the interface is called a/an: (a) concrete class (b) abstract class (c) discrete class (d) friendly class The compare To method should return _______ if the calling object equals the parameter. (a) A negative number (b) Zero (c) A positive number (d) Null