Ch 5 Test Computer Science Ap

Front 1

Memory for an object’s data is stored as part of the class template.

Back 1

False

Front 2

Every object has its own unique identity.

Back 2

True

Front 3

A client needs to know only a server’s interface.

Back 3

True

Front 4

It is not possible for two variables to refer to the same object.

Back 4

False

Front 5

A reference variable can be compared to the null value.

Back 5

True

Front 6

Class names must adhere to the rules for naming variables and methods.

Back 6

True

Front 7

Instance variables are nearly always declared to be public.

Back 7

False

Front 8

If a class template contains no constructors, the JVM provides a primitive default constructor.

Back 8

True

Front 9

You cannot call one constructor from another constructor.

Back 9

False

Front 10

If the return type of a method is not void, it can be any primitive or reference type.

Back 10

True

Front 11

Method names have the same syntax as other Java identifiers.

Back 11

True

Front 12

Helper methods are usually public.

Back 12

False

Front 13

When an object is instantiated, it gets a complete set of fresh instance variables

Back 13

True

Front 14

You cannot have a local variable and a global variable with the same name in a class.

Back 14

False

Front 15

You should use local variables to remember information in an object.

Back 15

False

Front 16

The combining of data and behavior into a single software package is called ____.

Back 16

Encapsulation

Front 17

An object has ____ as defined by the methods of its class.

Back 17

Behavior

Front 18

A server’s data requirements and the implementation of its methods are hidden from the client. This approach is referred to as ____.

Back 18

Information hiding

Front 19

Messages that change an object’s state are called ____.

Back 19

Mutators

Front 20

Suppose a Student class contains a method setName to set the value of a Student object’s instance variable name, plus a method getName to access the value of name. Consider the following code fragment:



Student s1, s2;

s1 = new Student();

s2 = new Student();

s1.setName(“Bill”);

s2.setName(“Eric”);

s2 = s1;

s2.setName(“Bob”);

System.out.println( s1.getName() );



What would be displayed on the console?

Back 20

Bob

Front 21

Methods used to initialize a new object are called ____.

Back 21

Contructors

Front 22

Class definitions usually begin with the keyword ____, indicating that the class is accessible to all potential clients.

Back 22

Public

Front 23

At the root (base) of Java’s class hierarchy is a class called ____.

Back 23

Object

Front 24

Constructors are activated when the keyword ____ is used.

Back 24

new

Front 25

Which of the following represents the general form of a method?
a. <visibility modifier> <return type> <method name> (<parameter list>){



<implementing code>



}
b. <return type> <visibility modifier> <method name> (<parameter list>){



<implementing code>



}
c. <visibility modifier> <method name> <return type> (<parameter list>){



<implementing code>



}
d. <return type> <method name> (<parameter list>){



<implementing code>



}

Back 25

(a)

Front 26

If a method has a return type, its implementing code must have at least one ____ statement that returns a value of that type.

Back 26

return

Front 27

____ variables can be declared in a method to provide temporary working storage for data in the method.

Back 27

Local

Front 28

The scope of a ____ is all the methods in the defining class.

Back 28

Global

Front 29

The ____ of a variable is the period during which it can be used.

Back 29

Lifetime

Front 30

The ____ class includes methods for all but two mouse events, mouse motion and mouse dragging.

Back 30

MouseAdapter