JAVA练习题含答案-answertopractice.docVIP

 PAGE 14??Walter Savitch???Absolute Java 2/e Chapter 7 Test Bank Chapter 7?Inheritance?? PAGE 13 Copyright ? 2006 Pearson Education Addison-Wesley. All rights reserved. Copyright ? 2004 Addison-Wesley. All rights reserved. Copyright ? 2006 Pearson Education Addison-Wesley. All rights reserved.  PAGE 1 Chapter 7Inheritance ??Multiple Choice Inheritance is the process by which a new class – known as a _________ - is created from another class, called the _____________. base class, derived class derived class, base class inherited class, base class base class, inherited class B Inheritance promotes code ___________. reinvention reuse repeats all of the above B The keyword extends indicates: encapsulation polymorphism inheritance none of the above C A derived class is also called a sub class super class base class all of the above A A super class is also called a derived class dominant class sub class base class D What does a derived class automatically inherit from the base class? instance variables static variables public methods all of the above D If the final modifier is added to the definition of a method, this means: The method may be redefined in the derived class. The method may be redefined in the sub class. The method may not be redefined in the derived class. None of the above. C A base class is synonymous with a: Child class Parent class Derived class Sub class B The special syntax for invoking a constructor of the base class is: super() base() parent() child() A An object of a derived class has the type of the derived class, and it also has the type of the base class, and more generally, has the type of every one of its ___________ classes. descendant child ancestor sub C In using the keyword this in place of super(), the invocation of this must be the ___________ action taken by the constructor. first last it does not matter none of the above A A method or instance variable modified by protected: can not be accessed by name inside its own