Question 1

Which of the following statements about test programs is true?

Accepted Answer

A)  Test programs verify that methods have been implemented correctly. 
B)  A tester class does not contain the main method. 
C)  You do not have to display the expected results. 
D)  Writing test programs is not an important skill. 
A)  Test programs verify that methods have been implemented correctly. 
B)  A tester class does not contain the main method. 
C)  You do not have to display the expected results. 
D)  Writing test programs is not an important skill.

Question 2

In the code below, write a statement that sets the graphic to green. public class ItalianFlagComponent extends JComponent
{
Public void paintComponent(GraphicsG) {
Graphics2D g2 = (Graphics2D) g;
Rectangle.Double leftRectangle = new Rectangle.Double(100, 100, 30, 60);
) . .
____
) . .
}
}

Accepted Answer

A)  g2.setColor(GREEN); 
B)  g2.SetColor(0, 255, 0); 
C)  g2.setColor(Color.GREEN); 
D)  g2.setColor("GREEN"); 
A)  g2.setColor(GREEN); 
B)  g2.SetColor(0, 255, 0); 
C)  g2.setColor(Color.GREEN); 
D)  g2.setColor("GREEN");

Question 3

Which of the following terms denotes the memory location of an object?

Accepted Answer

A)  implicit parameter 
B)  mutator method 
C)  encapsulation 
D)  object reference 
A)  implicit parameter 
B)  mutator method 
C)  encapsulation 
D)  object reference

Question 4

What is the output of the following code:
Int num1 = 6;
Int num2 = num1;
Num2 = num2 + 10;
System.out.println(num1);

Accepted Answer

A)  6 
B)  10 
C)  4 
D)  16 
A)  6 
B)  10 
C)  4 
D)  16

Question 5

The object on which the method call is invoked provides input to the method, and is called a(n) _________________.

Accepted Answer

A)  interface 
B)  procedure 
C)  implicit parameter 
D)  explicit parameter 
A)  interface 
B)  procedure 
C)  implicit parameter 
D)  explicit parameter

Question 6

By convention, classes begin with a(n) _____________.

Accepted Answer

A)  lowercase letter 
B)  dollar sign 
C)  digit 
D)  uppercase letter 
A)  lowercase letter 
B)  dollar sign 
C)  digit 
D)  uppercase letter

Question 7

Which of the following represents a method call to a method with a void return type?

Accepted Answer

A)  greeting.isEmpty() 
B)  System.out.println() 
C)  greeting.replace("Hello","World") 
D)  greeting.length() 
A)  greeting.isEmpty() 
B)  System.out.println() 
C)  greeting.replace("Hello","World") 
D)  greeting.length()

Question 8

Which of the following statements about objects is correct?

Accepted Answer

A)  An object defines the methods for a class. 
B)  Every object belongs to a class. 
C)  An object is a sequence of instructions. 
D)  All entities, even numbers, are objects. 
A)  An object defines the methods for a class. 
B)  Every object belongs to a class. 
C)  An object is a sequence of instructions. 
D)  All entities, even numbers, are objects.

Question 9

Assume that the variable count has been declared as type int. Which statement adds 10 to count?

Accepted Answer

A)  count = 10; 
B)  count == count + 10; 
C)  count = count + 10; 
D)  count + 10; 
A)  count = 10; 
B)  count == count + 10; 
C)  count = count + 10; 
D)  count + 10;

Question 10

Which of the following declares a variable that will store a measurement with fractional parts?

Accepted Answer

A)  int measure; 
B)  double measure; 
C)  String measure; 
D)  integer measure; 
A)  int measure; 
B)  double measure; 
C)  String measure; 
D)  integer measure;

Question 11

Which method call represents the invocation of a method that does not have explicit parameters?

Accepted Answer

A)  greeting.replace("Hello", "Welcome"); 
B)  greeting.length 
C)  greeting.length() 
D)  System.out.println(greeting); 
A)  greeting.replace("Hello", "Welcome"); 
B)  greeting.length 
C)  greeting.length() 
D)  System.out.println(greeting);

Question 12

If greeting refers to a String object, which of the following is a syntactically correct Java statement?

Accepted Answer

A)  System.out.println(length().greeting); 
B)  System.out.println(greeting()); 
C)  System.out.println(greeting.length()); 
D)  greeting.println("Hello"); 
A)  System.out.println(length().greeting); 
B)  System.out.println(greeting()); 
C)  System.out.println(greeting.length()); 
D)  greeting.println("Hello");

Question 13

Assuming the following Java statement: Circle c1 = new Circle(3);
What does the variable c1 store?

Accepted Answer

A)  The constructed object itself. 
B)  A reference to the Circle class. 
C)  A reference to the memory location of the constructed object. 
D)  The numeric value 3. 
A)  The constructed object itself. 
B)  A reference to the Circle class. 
C)  A reference to the memory location of the constructed object. 
D)  The numeric value 3.

Question 14

Which operator constructs object instances?

Accepted Answer

A)  new 
B)  instanceof 
C)  void 
D)  construct 
A)  new 
B)  instanceof 
C)  void 
D)  construct

Question 15

A method name is ____________________ if a class has more than one method with that name (but different parameter types).

Accepted Answer

A)  overridden 
B)  overimplemented 
C)  overwhelmed 
D)  overloaded 
A)  overridden 
B)  overimplemented 
C)  overwhelmed 
D)  overloaded

Question 16

What is a storage location in the computer's memory called that has a type, name, and contents?

Accepted Answer

A)  identifier 
B)  literal 
C)  label 
D)  variable 
A)  identifier 
B)  literal 
C)  label 
D)  variable

Question 17

Assume that the variable count has been declared as type int, which statement changes the value of count?

Accepted Answer

A)  count = 6; 
B)  count == 6; 
C)  integer count = 6; 
D)  count := 6; 
A)  count = 6; 
B)  count == 6; 
C)  integer count = 6; 
D)  count := 6;

Question 18

Which of the following code fragments will cause an error?

Accepted Answer

A)  String greeting = "Hello, Dave!"; 
B)  String greeting = "Hello, World!"; int n = greeting.length(); 
C)  int luckyNumber; System.out.println(luckyNumber); 
D)  PrintStream printer = System.out; 
A)  String greeting = "Hello, Dave!"; 
B)  String greeting = "Hello, World!"; int n = greeting.length(); 
C)  int luckyNumber; System.out.println(luckyNumber); 
D)  PrintStream printer = System.out;

Question 19

Which term is used to describe the name of a variable, method, or class?

Accepted Answer

A)  type 
B)  literal 
C)  identifier 
D)  label 
A)  type 
B)  literal 
C)  identifier 
D)  label

Question 20

What is an object?

Accepted Answer

A)  A sequence of instructions. 
B)  Any value stored in a variable. 
C)  An entity in your program that is manipulated by calling methods. 
D)  Any input to a method. 
A)  A sequence of instructions. 
B)  Any value stored in a variable. 
C)  An entity in your program that is manipulated by calling methods. 
D)  Any input to a method.

Exam 2: Using Objects

Which of the following statements about test programs is true?

In the code below, write a statement that sets the graphic to green. public class ItalianFlagComponent extends JComponent { Public void paintComponent(GraphicsG) { Graphics2D g2 = (Graphics2D) g; Rectangle.Double leftRectangle = new Rectangle.Double(100, 100, 30, 60); ) . . ____ ) . . } }

Which of the following terms denotes the memory location of an object?

What is the output of the following code: Int num1 = 6; Int num2 = num1; Num2 = num2 + 10; System.out.println(num1);

The object on which the method call is invoked provides input to the method, and is called a(n) _________________.

By convention, classes begin with a(n) _____________.

Which of the following represents a method call to a method with a void return type?

Which of the following statements about objects is correct?

Assume that the variable count has been declared as type int. Which statement adds 10 to count?

Which of the following declares a variable that will store a measurement with fractional parts?

Which method call represents the invocation of a method that does not have explicit parameters?

If greeting refers to a String object, which of the following is a syntactically correct Java statement?

Assuming the following Java statement: Circle c1 = new Circle(3); What does the variable c1 store?

Which operator constructs object instances?

A method name is ____________________ if a class has more than one method with that name (but different parameter types).

What is a storage location in the computer's memory called that has a type, name, and contents?

Assume that the variable count has been declared as type int, which statement changes the value of count?

Which of the following code fragments will cause an error?

Which term is used to describe the name of a variable, method, or class?

What is an object?

Introduction

Implementing Classes

Fundamental Data Types

Decisions

Loops

Arrays and Array Lists

Designing Classes

Inheritance

Interfaces

Inputoutput and Exception Handling

Object-Oriented Design

Recursion

Sorting and Searching

The Java Collections Framework

Basic Data Structures

Tree Structures

Generic Classes

Graphical User Interfaces

Streams and Binary Inputoutput

Multithreading

Internet Networking

Relational Databases

XML

Web Applications

Filters