Module 4 Quiz PDF

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Module 4 Quiz...

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Question 1



5 out of 5 points

When a field is declared static there will be Selected Answer:

only one copy of the field in memory. Question 2



5 out of 5 points

A static field is created by placing the key word static Selected Answer:

after the access specifier and before the field's data type. Question 3



5 out of 5 points

The key word this is the name of a reference variable that an object can use to refer to itself. Selected Answer:

Tru e

Question 4



5 out of 5 points

Overloading is Selected Answer:

having two or more methods with the same name but different signatures. Question 5



5 out of 5 points

Given the following method header, what will be returned from the method? public Rectangle getRectangle() Selected Answer:

the address of an object of the Rectangle class Question 6



5 out of 5 points

A declaration for an enumerated type begins with the ________ key word. Selected Answer:

enum

Question 7



5 out of 5 points

When an object is passed as an argument, it is actually a reference to the object that is passed. Selected Answer:



Tru e

Question 8 5 out of 5 points

You cannot use the fully-qualified name of an enum constant for

Selected Answer:

a case expressi on. Question 9



5 out of 5 points

An instance of a class does not have to exist in order for values to be stored in a class's static fields. Selected Answer:

Tru e

Question 10



5 out of 5 points

The names of the enum constants in an enumerated data type must be enclosed in quotation marks. Selected Answer:

Fals e

Question 11



5 out of 5 points

Whi choft hef ol l owi ngi snoti nvol vedi ni dent i f yi ngt hecl as sest obeusedwhendev el opi ng anobj ect or i ent edappl i cat i on?

Selected Answer:

The y field is available to code written outside the Circle class. Question 12



5 out of 5 points

A constructor Selected Answer:

has the same name as the class. Question 13



5 out of 5 points

A method that stores a value in a class's field or in some other way changes the value of a field is known as a mutator method. Selected Answer:

Tru e

Question 14



5 out of 5 points

Methods that operate on an object's fields are called Selected Answer:

instance methods. Question 15



5 out of 5 points

A constructor is a method that is automatically called when an object is created. Selected

Tru

Answer:

e

Question 16



5 out of 5 points

Which of the following is not involved in identifying the classes to be used when developing an object-oriented application? Selected Answer:

Write the code. Question 17



5 out of 5 points

The public access specifier for a field indicates that the field may not be accessed by statements outside the class. Selected Answer:

Fals e

Question 18



5 out of 5 points

The term "no-arg constructor" is applied to any constructor that does not accept arguments. Selected Answer:

Tru e

Question 19



5 out of 5 points

If you do not provide initialization values for a class's numeric fields, they will Selected Answer:

be automatically initialized to 0. Question 20



5 out of 5 points

For the following code, which statement is not true?

Selected Answer:

The z field is available to code written outside the Sphere class.

Examen



Question 1 2.5 out of 2.5 points

Assume the class BankAccount has been created and the following statement correctly creates an instance of the class.

BankAccount account = new BankAccount(5000.00);

What is true about the following statement? System.out.println(account); Selected Answer:

The account object's toString method will be implicitly called. Question 2



2.5 out of 2.5 points

If the following is from the method section of a UML diagram, which of the statements shown is true? + equals(object2:Stock) : boolean Selected Answer:

This is a public method that accepts a Stock object as its argument and returns a boolean value. Question 3



2.5 out of 2.5 points

What is the following statement an example of? import java.util.Scanner; Selected Answer:

an explicit import statemen t Question 4



2.5 out of 2.5 points

When a method's type is an object, what is actually returned by the calling program? Selected Answer:

a reference to an object of that class Question 5



0 out of 2.5 points

You can use the enum key word to Selected Answer:

create your own data type. Question 6



2.5 out of 2.5 points

"Shadowing" is the term used to describe how the field name is hidden by the name of a local or parameter variable. Selected Answer:

Tru e

Question 7



2.5 out of 2.5 points

Which is the key word used to import a class? Selected Answer:



import

Question 8 2.5 out of 2.5 points

Which symbol indicates that a member is public in a UML diagram? Selected Answer:

+

Question 9



2.5 out of 2.5 points

Assume the following declaration exists: enum Tree ( OAK, MAPLE, PINE )

What will the following code display? System.out.println(Tree.OAK); Selected Answer:

OAK

Question 10



2.5 out of 2.5 points

A method Selected Answer:

may have zero or more parameters. Question 11



2.5 out of 2.5 points

A declaration for an enumerated type begins with the ________ key word. Selected Answer:

enum

Question 12



2.5 out of 2.5 points

What does the following UML diagram entry mean? + setHeight(h : double) : void Selected Answer:

a public method with a parameter of data type double that does not return a value Question 13



2.5 out of 2.5 points

You can declare an enumerated data type inside a method. Selected Answer:

Fals e

Question 14



2.5 out of 2.5 points

The term "default constructor" is applied to the first constructor written by the author of the class. Selected Answer:



Fals e

Question 15 2.5 out of 2.5 points

For the following code, which statement is not true?

Selected Answer:

The y field is available to code written outside the Circle class. Question 16



2.5 out of 2.5 points

One or more objects may be created from a(n) Selected Answer:

clas s. Question 17



2.5 out of 2.5 points

If object1 and object2 are objects of the same class, to make object2 a copy of object1 Selected Answer:

write a method for the class that will make a field by field copy of object1 data members into object2 data members. Question 18



2.5 out of 2.5 points

Which of the following is not involved in identifying the classes to be used when developing an object-oriented application? Selected Answer:

Write the code. Question 19



2.5 out of 2.5 points

A method's signature consists of Selected Answer:

the method name and the parameter list. Question 20



2.5 out of 2.5 points

Overloading is Selected Answer:

having two or more methods with the same name but different signatures. Question 21



0 out of 2.5 points

A static field is created by placing the key word static Selected Answer:



after the access specifier and the field's data type. Question 22 2.5 out of 2.5 points

If you have defined a class, SavingsAccount, with a public static method, getNumberOfAccounts, and created a SavingsAccount object referenced by the variable account20, which of the following will call the getNumberOfAccounts method?

Selected Answer:

SavingsAccount.getNumberOfAccounts();

Question 23



2.5 out of 2.5 points

A class's static methods do not operate on the fields that belong to any instance of the class. Selected Answer:

Tru e

Question 24



2.5 out of 2.5 points

CRC stands for Selected Answer:

Class, Responsibilities, Collaborations. Question 25



2.5 out of 2.5 points

Which symbol indicates that a member is private a UML diagram? Selected Answer:

-

Question 26



2.5 out of 2.5 points

When an argument is passed by value Selected Answer:

the parameter variable holds the address of the argument. Question 27



2.5 out of 2.5 points

A method that stores a value in a class's field or in some other way changes the value of a field is known as a mutator method. Selected Answer:

Tru e

Question 28



2.5 out of 2.5 points

After the header, the body of the method appears inside a set of Selected Answer:

braces, { }

Question 29



2.5 out of 2.5 points

The key word new Selected Answer:



creates an object in memory. Question 30 2.5 out of 2.5 points

When the this variable is used to call a constructor

Selected Answer:

it must be the first statement in the constructor making the call. Question 31



2.5 out of 2.5 points

When you make a copy of the aggregate object and of the objects that it references, Selected Answer:

you are performing a deep copy. Question 32



2.5 out of 2.5 points

Methods that operate on an object's fields are called Selected Answer:

instance methods. Question 33



2.5 out of 2.5 points

Data hiding (which means that critical data stored inside the object is protected from code outside the object) is accomplished in Java by Selected Answer:

using the private access specifier on the class fields. Question 34



2.5 out of 2.5 points

An enumerated data type is actually a special type of class. Selected Answer:

Tru e

Question 35



2.5 out of 2.5 points

Which of the following can you use to compare two enum data values? Selected Answer:

the equals and compareTo met hods Question 36



2.5 out of 2.5 points

The only limitation that static methods have is Selected Answer:

they cannot refer to nonstatic members of the class. Question 37



2.5 out of 2.5 points

The scope of a local variable is Selected Answer:



the method in which it is defined. Question 38 2.5 out of 2.5 points

Enumerated types have the ________ method which returns the position of an enum constant in the declaration list. Selected Answer:

ordinal

Question 39



0 out of 2.5 points

A group of related classes is called a(n) archiv e.

Selected Answer: Debe ser

package

Question 40



2.5 out of 2.5 points

A class's responsibilities include Selected Answer:

both of these.

2 examen

Question 1 2.5 out of 2.5 points The "has a" relationship is sometimes called a(n) ________ because one object is part of a greater whole. Selected Answer: whole-part relationship

Question 2 2.5 out of 2.5 points The key word new Selected Answer:

creates an object in memory.

Question 3 2.5 out of 2.5 points The scope of a local variable is Selected Answer: the method in which it is defined.

Question 4 2.5 out of 2.5 points When a method's type is an object, what is actually returned by the calling program? Selected Answer: a reference to an object of that class

Question 5 2.5 out of 2.5 points If object1 and object2 are objects of the same class, to make object2 a copy of object1 Selected Answer: write a method for the class that will make a field by field copy of object1 data members into object2 data members.

Question 6 2.5 out of 2.5 points If a class has a method named finalize, it is called automatically just before an instance of the class is destroyed by the garbage collector. Selected Answer: True

Question 7 2.5 out of 2.5 points A group of related classes is called a(n) Selected Answer:

package.

Question 8 2.5 out of 2.5 points Assume the following declaration exists: enum Tree ( OAK, MAPLE, PINE ) What will the following code display? System.out.println(Tree.OAK); OAK Selected Answer:

Question 9 2.5 out of 2.5 points You can use the enum key word to Selected Answer:

F Both of these

Question 10 2.5 out of 2.5 points For the following code, which statement is not true?

Selected Answer:

The z field is available to code written outside the Sphere class.

Question 11 2.5 out of 2.5 points UML diagrams do not contain Selected Answer: object names.

Question 12 2.5 out of 2.5 points If you write a toString method for a class, Java will

automatically call the method any time you concatenate an object of the class with a string. Selected Answer: True

Question 13 2.5 out of 2.5 points You cannot use the fully-qualified name of an enum constant for Selected Answer: a case expression.

Question 14 2.5 out of 2.5 points If the following is from the method section of a UML diagram, which of the statements shown is true? + equals(object2:Stock) : boolean Selected Answer: This is a public method that accepts a Stock object as its argument and returns a boolean value.

Question 15 2.5 out of 2.5 points After the header, the body of the method appears inside a set of Selected Answer: braces, { }

Question 16 2.5 out of 2.5 points When you write an enumerated type declaration, you Selected Answer: All of these

Question 17 2.5 out of 2.5 points The public access specifier for a field indicates that the field may not be accessed by statements outside the class. Selected Answer: False

Question 18 2.5 out of 2.5 points An access specifier indicates how a class may be accessed. Selected Answer: True

Question 19 2.5 out of 2.5 points One or more objects may be created from a(n) Selected Answer: class.

Question 20 2.5 out of 2.5 points Given the following method header, what will be returned from the method? public Rectangle getRectangle() Selected Answer: the address of an object of the Rectangle class

Question 21 2.5 out of 2.5 points A class that is defined inside another class is called a(n) Selected Answer:

inner class.

Question 22 2.5 out of 2.5 points Of the following, which would be considered the no-arg constructor for the Rectangle class? public Selected Answer:

Rectangle()

Question 23 2.5 out of 2.5 points If you do not provide initialization values for a class's numeric fields, they will

Selected Answer:

be automatically initialized to 0.

Question 24 2.5 out of 2.5 points You should not define a class that is dependent on the values of other class fields Selected Answer: in order to avoid having stale data.

Question 25 2.5 out of 2.5 points

enum constants have a toString method. Selected Answer:

True

Question 26 2.5 out of 2.5 points What is the following statement an example of? import java.util.*; Selected Answer: a wildcard import statement

Question 27 2.5 out of 2.5 points A constructor is a method that is automatically called when an object is created. Selected Answer: True

Question 28 2.5 out of 2.5 points Using the blueprint/house analogy, you can think of a class as a blueprint that describes a house and ________ as instances of the house built from the blueprint. Selected Answer: objects

Question 29 2.5 out of 2.5 points

If you have defined a class, SavingsAccount, with a public static method, getNumberOfAccounts, and created a SavingsAccount object referenced by the variable account20, which of the following will call the getNumberOfAccounts method? SavingsAccount. Selected Answer:

getNumberOfAcco unts();

Question 30 2.5 out of 2.5 points A class's static methods do not operate on the fields that belong to any instance of the class. Selected Answer: True

Question 31 2.5 out of 2.5 points Which of the following is not involved in identifying the classes to be used when developing an object-oriented application? Selected Answer: Write the code.

Question 32 2.5 out of 2.5 points When a local variable in an instance method has the same name as an instance field, the instance field hides the local variable. Selected Answer: False

Question 33 2.5 out of 2.5 points Enumerated types have the ________ method which returns the position of an enum constant in the declaration list. ordinal Selected Answer:

Question 34 2.5 out of 2.5 points

A static field is created by placing the key word

static Selected Answer:

after the access specifier and before the field's data type.

Question 35 2.5 out of 2.5 points Class objects normally have ________ that perform useful operations on their data, but primitive variables do not. Selected Answer: methods

Question 36 2.5 out of 2.5 points For the following code, which statement is not true?

Selected Answer:

The y field is available to code written outside the Circle class.

Question 37 2.5 out of 2.5 points A declaration for an enumerated type begins with the ________ key word. enum Selected Answer:

Question 38 2.5 out of 2.5 points The key word this is the name of a reference variable that an object can use to refer to itself. Selected Answer: True

Question 39 2.5 out of 2.5 points When a field is declared static there will be Selected Answer:

only one copy of the

field in memory.

Question 40 2.5 out of 2.5 points You can declare an enumerated data type inside a method. Selected Answer: False...