Question 1

When the this variable is used to call a constructor,

Accepted Answer

A)  it must be the first statement in the constructor making the call 
B)  it must be the last statement in the constructor making the call 
C)  it can be anywhere in the constructor making the call 
D)  You cannot use the this variable in a constructor call. 
A)  it must be the first statement in the constructor making the call 
B)  it must be the last statement in the constructor making the call 
C)  it can be anywhere in the constructor making the call 
D)  You cannot use the this variable in a constructor call. A

Question 2

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

Accepted Answer

A) True 
 B)False  True

Question 3

The only limitation that static methods have is

Accepted Answer

A)  they can refer to only non-static members of the class 
B)  they can only be called from static members of the class 
C)  they must be declared as public methods 
D)  they cannot refer to non-static members of the class 
A)  they can refer to only non-static members of the class 
B)  they can only be called from static members of the class 
C)  they must be declared as public methods 
D)  they cannot refer to non-static members of the class D

Question 4

When a field is declared static,there will be

Accepted Answer

A)  a copy of the field in each class object 
B)  only one copy of the field in memory 
C)  a copy of the field for each static method in the class 
D)  only two copies of the field in memory 
A)  a copy of the field in each class object 
B)  only one copy of the field in memory 
C)  a copy of the field for each static method in the class 
D)  only two copies of the field in memory

Question 5

Look at the following declaration. enum Tree { OAK,MAPLE,PINE }
What is the fully-qualified name of the PINE enum constant?

Accepted Answer

A)  PINE 
B)  enum.PINE 
C)  Tree.PINE 
D)  enum.PINE. 
E)  PINE.Tree 
A)  PINE 
B)  enum.PINE 
C)  Tree.PINE 
D)  enum.PINE. 
E)  PINE.Tree

Question 6

CRC stands for

Accepted Answer

A)  Code,Reuse,Constancy 
B)  Class,Responsibilities,Collaborations 
C)  Class,Redundancy,Collections 
D)  Class,Recyclability,Collaborations 
A)  Code,Reuse,Constancy 
B)  Class,Responsibilities,Collaborations 
C)  Class,Redundancy,Collections 
D)  Class,Recyclability,Collaborations

Question 7

Which of the following is not true about static methods?

Accepted Answer

A)  It is necessary for an instance of the class to be created to execute the method. 
B)  They are created by placing the key word static after the access specifier in the method header. 
C)  They are called directly from the class. 
D)  They are often used to create utility classes that perform operations on data,but have no need to collect and store data. 
A)  It is necessary for an instance of the class to be created to execute the method. 
B)  They are created by placing the key word static after the access specifier in the method header. 
C)  They are called directly from the class. 
D)  They are often used to create utility classes that perform operations on data,but have no need to collect and store data.

Question 8

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

Accepted Answer

A) True 
 B)False

Question 9

When an object reference is passed to a method,the method may change the values in the object.

Accepted Answer

A) True 
 B)False

Question 10

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?

Accepted Answer

A)  getNumberOfAccounts(); 
B)  SavingsAccount.getNumberOfAccounts(); 
C)  getNumberOfAccounts(account20); 
D)  None of the above,you cannot call a static method. 
A)  getNumberOfAccounts(); 
B)  SavingsAccount.getNumberOfAccounts(); 
C)  getNumberOfAccounts(account20); 
D)  None of the above,you cannot call a static method.

Question 11

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

Accepted Answer

A)  assign object1 to object2,such as object2 = object1; 
B)  write a copy method that will make a field by field copy of object1 data members into object2 data members 
C)  use the Java copy method that is a part of the Java language 
D)  use the default constructor to create object2 with object1 data members 
A)  assign object1 to object2,such as object2 = object1; 
B)  write a copy method that will make a field by field copy of object1 data members into object2 data members 
C)  use the Java copy method that is a part of the Java language 
D)  use the default constructor to create object2 with object1 data members

Question 12

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.

Accepted Answer

A) True 
 B)False

Question 13

What will be returned from a method,if the following is the method header: public Rectangle getRectangle()

Accepted Answer

A)  An object of the class Rectangle 
B)  The address of an object of the class Rectangle 
C)  The values stored in the data members of the Rectangle object the method changed 
D)  A graph of a rectangle 
A)  An object of the class Rectangle 
B)  The address of an object of the class Rectangle 
C)  The values stored in the data members of the Rectangle object the method changed 
D)  A graph of a rectangle

Question 14

The this key word is the name of a reference variable that is available to all static methods.

Accepted Answer

A) True 
 B)False

Question 15

You cannot use the fully-qualifed name of an enum constant for this.

Accepted Answer

A)  a switch expression 
B)  an argument to a method 
C)  a case expression 
D)  all of these 
A)  a switch expression 
B)  an argument to a method 
C)  a case expression 
D)  all of these

Question 16

A declaration for an enumerated type begins with this key word.

Accepted Answer

A)  enumerated 
B)  enum_type 
C)  enum 
D)  ENUM 
A)  enumerated 
B)  enum_type 
C)  enum 
D)  ENUM

Question 17

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

Accepted Answer

A) True 
 B)False

Question 18

An enumerated data type is actually a special type of class.

Accepted Answer

A) True 
 B)False

Question 19

If you have defined a class named SavingsAccount with a public static data member named numberOfAccounts,and created a SavingsAccount object referenced by the variable account20,which of the following will assign numberOfAccounts to numAccounts?

Accepted Answer

A)  numAccounts = account20.numAccounts; 
B)  numAccounts = numberOfAccounts; 
C)  numAccounts = SavingsAccount.numberOfAccounts; 
D)  None of the above,you cannot reference a static data member. 
A)  numAccounts = account20.numAccounts; 
B)  numAccounts = numberOfAccounts; 
C)  numAccounts = SavingsAccount.numberOfAccounts; 
D)  None of the above,you cannot reference a static data member.

Question 20

The whole-part relationship created by object aggregation is more often called

Accepted Answer

A)  a has a relationship 
B)  an inner class relationship 
C)  an extra class relationship 
D)  an inside class relationship 
A)  a has a relationship 
B)  an inner class relationship 
C)  an extra class relationship 
D)  an inside class relationship

Exam 9: A Second Look at Classes and Objects

When the this variable is used to call a constructor,

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

The only limitation that static methods have is

When a field is declared static,there will be

Look at the following declaration. enum Tree { OAK,MAPLE,PINE } What is the fully-qualified name of the PINE enum constant?

CRC stands for

Which of the following is not true about static methods?

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

When an object reference is passed to a method,the method may change the values in the object.

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?

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

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.

What will be returned from a method,if the following is the method header: public Rectangle getRectangle()

The this key word is the name of a reference variable that is available to all static methods.

You cannot use the fully-qualifed name of an enum constant for this.

A declaration for an enumerated type begins with this key word.

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

An enumerated data type is actually a special type of class.

If you have defined a class named SavingsAccount with a public static data member named numberOfAccounts,and created a SavingsAccount object referenced by the variable account20,which of the following will assign numberOfAccounts to numAccounts?

The whole-part relationship created by object aggregation is more often called

Introduction to Computers and Java

Java Fundamentals

Decision Structures

Loops and Files

Methods

A First Look at Classes

A First Look at Gui Applications

Arrays and the Arraylist Class

Text Processing and More About Wrapper Classes

Inheritance

Exceptions and Advanced File Io

Advanced Gui Applications

Applets and More

Recursion

Sorting, Searching, and Algorithm Analysis

Generics

Collections

Array-Based Lists

Linked Lists

Stacks and Queues

Binary Trees, Avl Trees, and Priority Queues

Filters