Chapter 11

Question 1

abstract class

Answer 1

A class that defines attributes and methods for subclasses but is never instantiated. (384)

Question 2

abstract method

Answer 2

A method that is specified but not implemented in an abstract class. The subclasses must implement this method. (406)

Question 3

aggregation

Answer 3

A relationship between two classes in which instances of one class are contained in an instance of the other class. (414)

Question 4

aliasing

Answer 4

When more than one variable points to the same object. (427)

Question 5

class (static) method

Answer 5

A method that is invoked when a message is sent to a class. For example, Math.sqrt is a class method. (384)

Question 6

class (static) variable

Answer 6

A variable that is visible to all instances of a class and, if public, is accessed by specifying the class name. (384)

Question 7

concrete class

Answer 7

A class that can be instantiated. (406)

Question 8

dependency

Answer 8

A relationship between two classes in which an instance of one class uses an instance of the other class to perform a task. (414)

Question 9

final method

Answer 9

A method that cannot be overridden by a subclass. (407)

Question 10

inheritance

Answer 10

The process by which a subclass can reuse attributes and behavior defined in a superclass. (384)

Question 11

interface

Answer 11

A Java file that simply specifies the methods to be implemented by another class. A class that implements several interfaces can thus adopt the behavior of several classes. (391)

Question 12

overriding

Answer 12

The process of re-implementing a method already implemented in a superclass. (413)

Question 13

postcondition

Answer 13

A statement of what is true after a certain action is taken. (418)

Question 14

precondition

Answer 14

A statement of what is true before a certain action is taken. (418)