Question 1

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.

Accepted Answer

A) True 
 B)False

Question 2

If a class has a method named finalize,it is called automatically just before a data member that has been identified as final of the class is destroyed by the garbage collector.

Accepted Answer

A) True 
 B)False

Question 3

When a method's return type is a class,what is actually returned to the calling program?

Accepted Answer

A)  An object of that class 
B)  A reference to an object of that class 
C)  Only the values in the object that the method accessed 
D)  Nothing,the return type is strictly for documentation in this situation 
A)  An object of that class 
B)  A reference to an object of that class 
C)  Only the values in the object that the method accessed 
D)  Nothing,the return type is strictly for documentation in this situation

Question 4

Assume the class BankAccount has been created,and the following statement correctly creates an instance of the class: BankAccount account = new BankAccount(5000.0);
What is true about the following statement?
System.out.println(account);

Accepted Answer

A)  The method will display unreadable binary data on the screen. 
B)  A compiler error will occur. 
C)  The account object's toString method will be implicitly called. 
D)  A runtime error will occur. 
A)  The method will display unreadable binary data on the screen. 
B)  A compiler error will occur. 
C)  The account object's toString method will be implicitly called. 
D)  A runtime error will occur.

Question 5

Enum constants have a toString method.

Accepted Answer

A) True 
 B)False

Question 6

A static field is created by placing

Accepted Answer

A)  the key word static after the field name 
B)  the key word static after the access specifier and before the field's data type 
C)  the key word static after the access specifier and field's data type 
D)  it in a static field block 
A)  the key word static after the field name 
B)  the key word static after the access specifier and before the field's data type 
C)  the key word static after the access specifier and field's data type 
D)  it in a static field block

Question 7

The JVM periodically performs this process to remove unreferenced objects from memory.

Accepted Answer

A)  memory sweeping 
B)  garbage collection 
C)  memory shuffling 
D)  system restore 
A)  memory sweeping 
B)  garbage collection 
C)  memory shuffling 
D)  system restore

Question 8

If the following is from the method section of a UML diagram,which of the following statements is true? + add(object2:Stock): Stock

Accepted Answer

A)  This is a private method named add that accepts and returns objects of the Stock class. 
B)  This is a private method named Stock that adds two objects. 
C)  This is a public method named add that accepts and returns references to objects in the Stock class. 
D)  This is a public method named Stock that adds two objects. 
A)  This is a private method named add that accepts and returns objects of the Stock class. 
B)  This is a private method named Stock that adds two objects. 
C)  This is a public method named add that accepts and returns references to objects in the Stock class. 
D)  This is a public method named Stock that adds two objects.

Question 9

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

Accepted Answer

A)  This is a private method that receives two objects from the Stock class and returns a boolean value 
B)  This is a public method that accepts a Stock object as its argument and returns a boolean value 
C)  This is a private method that returns a boolean value 
D)  This is a public method that returns a Stock object 
A)  This is a private method that receives two objects from the Stock class and returns a boolean value 
B)  This is a public method that accepts a Stock object as its argument and returns a boolean value 
C)  This is a private method that returns a boolean value 
D)  This is a public method that returns a Stock object

Question 10

Look at the following declaration. enum Tree { OAK,MAPLE,PINE }
What is the ordinal value of the MAPLE enum constant?

Accepted Answer

A)  0 
B)  1 
C)  2 
D)  3 
E)  Tree.MAPLE 
A)  0 
B)  1 
C)  2 
D)  3 
E)  Tree.MAPLE

Question 11

If you write a toString method to display the contents of an object,object1,for a class,Class1,then the following two statements are equivalent:
System.out.println(object1);
System.out.println(object1.toString());

Accepted Answer

A) True 
 B)False

Question 12

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

Accepted Answer

A) True 
 B)False

Question 13

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

Accepted Answer

A) True 
 B)False

Question 14

Assuming the following declaration exists: enum Tree { OAK,MAPLE,PINE }
What will the following code display?
System.out.println(Tree.OAK);

Accepted Answer

A)  Tree.OAK 
B)  0 
C)  1 
D)  OAK 
E)  Nothing.This statement will cause an error. 
A)  Tree.OAK 
B)  0 
C)  1 
D)  OAK 
E)  Nothing.This statement will cause an error.

Question 15

Enumerated types have this method,which returns the position of an enum constant in the declaration list.

Accepted Answer

A)  toString 
B)  position 
C)  ordinal 
D)  location 
A)  toString 
B)  position 
C)  ordinal 
D)  location

Question 16

The term for the relationship created by object aggregation is

Accepted Answer

A)  Has a 
B)  Is a 
C)  Sub-class object 
D)  Inner class 
A)  Has a 
B)  Is a 
C)  Sub-class object 
D)  Inner class

Question 17

You can declare an enumerated data type inside of a method.

Accepted Answer

A) True 
 B)False

Question 18

Which of the following is not true about static methods?

Accepted Answer

A)  It is not 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 from an instance of 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 not 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 from an instance of 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 19

A deep copy of an object

Accepted Answer

A)  is an assignment of that object to another object 
B)  is an operation that copies an aggregate object,and all the objects it references 
C)  is a bogus term,it has no meaning 
D)  is always a private method 
A)  is an assignment of that object to another object 
B)  is an operation that copies an aggregate object,and all the objects it references 
C)  is a bogus term,it has no meaning 
D)  is always a private method

Question 20

If the this variable is used to call a constructor,

Accepted Answer

A)  a compiler error will result,if it is not the first statement of the constructor. 
B)  a compiler error will result,if it is the first statement of the constructor. 
C)  nothing will happen. 
D)  The this variable cannot be used as a constructor call. 
A)  a compiler error will result,if it is not the first statement of the constructor. 
B)  a compiler error will result,if it is the first statement of the constructor. 
C)  nothing will happen. 
D)  The this variable cannot be used as a constructor call.

Exam 9: A Second Look at Classes and Objects

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.

If a class has a method named finalize,it is called automatically just before a data member that has been identified as final of the class is destroyed by the garbage collector.

When a method's return type is a class,what is actually returned to the calling program?

Assume the class BankAccount has been created,and the following statement correctly creates an instance of the class: BankAccount account = new BankAccount(5000.0); What is true about the following statement? System.out.println(account);

Enum constants have a toString method.

A static field is created by placing

The JVM periodically performs this process to remove unreferenced objects from memory.

If the following is from the method section of a UML diagram,which of the following statements is true? + add(object2:Stock): Stock

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

Look at the following declaration. enum Tree { OAK,MAPLE,PINE } What is the ordinal value of the MAPLE enum constant?

If you write a toString method to display the contents of an object,object1,for a class,Class1,then the following two statements are equivalent: System.out.println(object1); System.out.println(object1.toString());

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

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

Assuming the following declaration exists: enum Tree { OAK,MAPLE,PINE } What will the following code display? System.out.println(Tree.OAK);

Enumerated types have this method,which returns the position of an enum constant in the declaration list.

The term for the relationship created by object aggregation is

You can declare an enumerated data type inside of a method.

Which of the following is not true about static methods?

A deep copy of an object

If the this variable is used to call a constructor,

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