Chapter 9 - Inheritance and Interfaces

Question 1

The is-a relationship between a more general superclass and a more specialized subclass.

Answer 1

inheritance

Question 2

A general class from which a more specialized class (a subclass) inherits.

Answer 2

superclass

Question 3

A class that inherits variables and methods from a superclass but adds instance variables, adds methods, or redefines methods.

Answer 3

subclass

Question 4

The principle that a subclass object can be used in place of any superclass object.

Answer 4

substitution principle

Question 5

Redefining a method in a subclass.

Answer 5

override

Question 6

Giving more than one meaning to a method name.

Answer 6

overloaded

Question 7

Selecting a method to be invoked at run time. In Java, dynamic method lookup considers the class of the implicit parameter object to select the appropriate method.

Answer 7

dynamic method lookup

Question 8

Selecting a method among several methods that have the same name on the basis of the actual types of the implicit parameters.

Answer 8

polymorphism

Question 9

A method with a name, parameter variable types, and return type but without an implementation.

Answer 9

abstract method

Question 10

A class that cannot be instantiated.

Answer 10

abstract class

Question 11

A class that can be instantiated.

Answer 11

concrete class

Question 12

A value that is computed by a hash function.

Answer 12

hash code

Question 13

A type with no instance variables, only abstract methods and constants.

Answer 13

interface type

Question 14

Implementing an interface Implementing a class that defines all methods specified in the interface.

Answer 14

implements

Question 15

A value that cannot be changed by a program. In Java, constants are defined with the reserved word final.

Answer 15

constants