Ch8 Quiz review

Question 0

The ____ of a class are called the members of a class.

Answer 0

Components

Question 1

T/F

Finalizers are value-returning methods that return the final value of a variable.

Answer 1

FALSE

Question 2

T/F
Members of a class consist of packages, methods, and libraries.

Answer 2

FALSE

Question 3

T/F

You can import your classes the same way you import Java classes.

Answer 3

TRUE

Question 4

Which of the following set of statements are valid in Java?

(i) bigRect.area();
bigRect.perimeter();
bigRect.print();

(ii) bigRect.area = bigRect.area();
bigRect.perimeter = bigRect.perimeter();
bigRect.print();

Answer 4

Only (i)

Question 5

How do you declare a new reference variable of the type Illustrate and instantiate the object with a value of 9?

Answer 5

Illustrate illObject = new Illustrate(9);

Question 6

What is the function of the reserved word class?

Answer 6

It defines only a data type / does not allocate memory

Question 7

T/F
An accessor method of a class first accesses the values of the data members of the class and then changes the value of the data members.

Answer 7

FALSE

Question 8

In ___ copying, each reference variable refers to its own object.

Answer 8

Deep

Question 9

T/F

In shallow copying, each reference variable refers to its own object.

Answer 9

FALSE

Question 10

T/F
The method finalize automatically executes when the class object goes out of scope.

Answer 10

TRUE

Question 11

Which statement correctly instantiates the Rectangle object myRectangle?

(i) myRectangle Rectangle = new Rectangle (10,12);
(ii) class myRectangle = new Rectangle (10,12);
(iii) Rectangle myRectangle = new Rectangle (10,12);

Answer 11

Only (iii)

Question 12

T/F
The following statement is legal:
aa.print();

Answer 12

TRUE

Question 13

What is the main use of inner classes?

Answer 13

To handle events

Question 14

T/F
The components of a class are called fields.

Answer 14

FALSE

Question 15

T/F

Modifiers are used to altar the behavior of the class.

Answer 15

TRUE

Question 16

When does the method finalize execute?

Answer 16

When the class object goes out of scope

Question 17

Which of the following statements are valid in Java?

(i) r = console.nextDouble();
myCircle.area = 3.14 * r * r;
System.out.println(myCircle.area);

(ii) r = console.nextDouble();
myCircle.set(r);
System.out.println(myCircle.area);

Answer 17

Only ii

Question 18

What is a constructor without parameters?

Answer 18

Default constructor

Question 19

T/F

The built in operation that is valid for classes is the dot (.) operator

Answer 19

TRUE

Question 20

What does the constructor do in the class definition above? //missing info above

Answer 20

Sets value of X to 1

Question 21

T/F
If a class method is used to implement a binary operation on the class objects; then the method must have two parameters of the class type.

Answer 21

FALSE

Question 22

T/F
The following statement is legal:
aa.x = 10;

Answer 22

FALSE

Question 23

Which of the following statements is illegal?
//missing info

Answer 23

Illustrate.x++;

Question 24

Which of the following statements are valid in Java?

(i) bigRect.set(10, 5};

(ii) bigRect.length = 10;
bigRect.width = 5;

Answer 24

Only (i)

Question 25

T/F
A class and its members can be described graphically using Unified Modeling Language (UML) notation.

Answer 25

TRUE

Question 26

T/F

If the object is created in a user program, then the object can access both the public and private members of the class.

Answer 26

FALSE

Question 27

T/F 
When no object of the class type is instantiated static data members of the class fail to exist.

Answer 27

FALSE

Question 28

Which of the following statements are valid in Java?

(i) person2 = person1;

(ii) n = person1.getName();
    a = person1.getAge();
    h = person1.getHeight();
    w = person1.getWeight();
    person2.set(n, a, h, w);

Answer 28

Both (i) and (ii)

Question 29

T/F
If a member of a class is public you cannot access it outside the class.

Answer 29

FALSE

Question 30

T/F
If a member of a class is a method, it can directly access any member of the class.

Answer 30

TRUE

Question 31

T/F

A constructor has the same name as the class.

Answer 31

TRUE

Question 32

T/F

You cannot override the default definition of the method: toString because it’s provided by Java.

Answer 32

FALSE

Question 33

Which of the following words indicates an object’s reference to itself?

Answer 33

This

Question 34

T/F
A class can have only one constructor.

Answer 34

FALSE