Question 1

Which of the following expressions correctly compute 5 + 26?

Accepted Answer

A)  result = 5 + 2^6; 
B)  result = 5 + 2*exponent(6); 
C)  result = 5 + 2*Math.exponent(6); 
D)  result = 5 + Math.pow(2, 6); 
E)  none of the above 
A)  result = 5 + 2^6; 
B)  result = 5 + 2*exponent(6); 
C)  result = 5 + 2*Math.exponent(6); 
D)  result = 5 + Math.pow(2, 6); 
E)  none of the above D

Question 2

When two references point to the same object, ________________________________ .

Accepted Answer

A)  a run-time error will occur. 
B)  a compiler error will occur. 
C)  the references are called aliases of each other. 
D)  the object will be marked for garbage collection. 
E)  the references are called null references. 
A)  a run-time error will occur. 
B)  a compiler error will occur. 
C)  the references are called aliases of each other. 
D)  the object will be marked for garbage collection. 
E)  the references are called null references. C

Question 3

A special method that is invoked to set up an object during instantiation is called a ___________________.

Accepted Answer

A)  new method 
B)  dot operator 
C)  creator 
D)  constructor 
E)  destructor 
A)  new method 
B)  dot operator 
C)  creator 
D)  constructor 
E)  destructor D

Question 4

When an object variable is declared but it is not assigned a value, it is called a ______________________.

Accepted Answer

A)  null reference 
B)  empty reference 
C)  void reference 
D)  zero reference 
E)  static reference 
A)  null reference 
B)  empty reference 
C)  void reference 
D)  zero reference 
E)  static reference

Question 5

The ________________ operator is used to instantiate an object.

Accepted Answer

A)  static 
B)  new 
C)  + 
D)  - 
E)  none of the above 
A)  static 
B)  new 
C)  + 
D)  - 
E)  none of the above

Question 6

Which of the following is an invalid way to instantiate a String object?

Accepted Answer

A)  String title = new String("Java Software Solutions"); 
B)  String name = "John Lewis"; 
C)  String empty = ""; 
D)  String alsoEmpty = new String(""); 
E)  all of the above are valid 
A)  String title = new String("Java Software Solutions"); 
B)  String name = "John Lewis"; 
C)  String empty = ""; 
D)  String alsoEmpty = new String(""); 
E)  all of the above are valid

Question 7

Write a single line that creates a wrapper for an int variable num.

Accepted Answer

Integer nu

Question 8

Suppose we have a String object called myString. Write a single line of Java code that will output myString in such a way that all of its characters are uppercase.

Accepted Answer

System.out

Question 9

Which of the following is a correct declaration of enumerated type for the suits of a deck of cards?

Accepted Answer

A)  enumerated type Suit = { hearts, spades, diamonds, clubs }; 
B)  enum Suit {hearts, spades, diamonds, clubs }; 
C)  enum Suit {hearts, spades, diamonds, clubs } 
D)  enumerated type Suit = {hearts, spades, diamonds, clubs }; 
E)  enum Suit = { hearts, spades, diamonds, clubs } 
A)  enumerated type Suit = { hearts, spades, diamonds, clubs }; 
B)  enum Suit {hearts, spades, diamonds, clubs }; 
C)  enum Suit {hearts, spades, diamonds, clubs } 
D)  enumerated type Suit = {hearts, spades, diamonds, clubs }; 
E)  enum Suit = { hearts, spades, diamonds, clubs }

Question 10

Assume that we have a Random object referenced by a variable called generator. Which of the following lines will generate a random number in the range 5-20 and store it in the int variable randNum?

Accepted Answer

A)  randNum = generator.nextInt(15) + 5; 
B)  randNum = generator.nextInt(15) + 6; 
C)  randNum = generator.nextInt(16) + 5; 
D)  randNum = generator.nextInt(16) + 6; 
E)  none of the above 
A)  randNum = generator.nextInt(15) + 5; 
B)  randNum = generator.nextInt(15) + 6; 
C)  randNum = generator.nextInt(16) + 5; 
D)  randNum = generator.nextInt(16) + 6; 
E)  none of the above

Question 11

Write an expression that will compute the length of the tangent of a right triangle, given one of the non-right angles. You may assume that this value is stored in a variable called angle.

Accepted Answer

tangent =

Question 12

The Math class is part of the java.lang package.

Accepted Answer

A) True 
 B)False

Question 13

Explain how variables representing objects and variables representing primitive types are different.

Accepted Answer

A variable representing a primitive type

Question 14

Write a short program that allows the user to input a positive integer and then outputs a randomly generated integer between 1 and the input number.

Accepted Answer

import java.util.Scanner;
import java.ut

Question 15

All of the classes contained in the java.util package are automatically included in every Java program.

Accepted Answer

A) True 
 B)False

Question 16

The String class _______________________________ .

Accepted Answer

A)  is part of the java.lang package. 
B)  is part of the java.util.package. 
C)  is a wrapper class. 
D)  none of the above. 
E)  all of the above. 
A)  is part of the java.lang package. 
B)  is part of the java.util.package. 
C)  is a wrapper class. 
D)  none of the above. 
E)  all of the above.

Question 17

Enumerated types allow a programmer to treat primitive data as objects.

Accepted Answer

A) True 
 B)False

Question 18

Write a short program that asks the user to input a string, and then outputs the number of characters in the string.

Accepted Answer

import java.util.Scanner;
public class S

Question 19

Explain what it means for a String object to be immutable. Are there any workarounds for this?

Accepted Answer

String objects are immutable, meaning th

Question 20

A variable that is declared as a primitive type stores the actual value of the associated data. A variable that is declared as an object type stores a pointer to the associated object.

Accepted Answer

A) True 
 B)False

Which of the following expressions correctly compute 5 + 2⁶?

When two references point to the same object, ________________________________ .

A special method that is invoked to set up an object during instantiation is called a ___________________.

When an object variable is declared but it is not assigned a value, it is called a ______________________.

The ________________ operator is used to instantiate an object.

Which of the following is an invalid way to instantiate a String object?

Write a single line that creates a wrapper for an int variable num.

Suppose we have a String object called myString. Write a single line of Java code that will output myString in such a way that all of its characters are uppercase.

Which of the following is a correct declaration of enumerated type for the suits of a deck of cards?

Assume that we have a Random object referenced by a variable called generator. Which of the following lines will generate a random number in the range 5-20 and store it in the int variable randNum?

Write an expression that will compute the length of the tangent of a right triangle, given one of the non-right angles. You may assume that this value is stored in a variable called angle.

The Math class is part of the java.lang package.

Explain how variables representing objects and variables representing primitive types are different.

Write a short program that allows the user to input a positive integer and then outputs a randomly generated integer between 1 and the input number.

All of the classes contained in the java.util package are automatically included in every Java program.

The String class _______________________________ .

Enumerated types allow a programmer to treat primitive data as objects.

Write a short program that asks the user to input a string, and then outputs the number of characters in the string.

Explain what it means for a String object to be immutable. Are there any workarounds for this?

A variable that is declared as a primitive type stores the actual value of the associated data. A variable that is declared as an object type stores a pointer to the associated object.

Introduction

Data and Expressions

Conditionals and Loops

Writing Classes

Graphical User Interfaces

Arrays

Inheritance

Polymorphism

Recursion

Exceptions

Searching and Sorting

Trees

Introduction to Collections and Stacks

Heaps and Priority Queues

Graphs

Filters

Exam 3: Using Classes and Objects

Which of the following expressions correctly compute 5 + 26?

When two references point to the same object, ________________________________ .

A special method that is invoked to set up an object during instantiation is called a ___________________.

When an object variable is declared but it is not assigned a value, it is called a ______________________.

The ________________ operator is used to instantiate an object.

Which of the following is an invalid way to instantiate a String object?

Write a single line that creates a wrapper for an int variable num.

Suppose we have a String object called myString. Write a single line of Java code that will output myString in such a way that all of its characters are uppercase.

Which of the following is a correct declaration of enumerated type for the suits of a deck of cards?

Assume that we have a Random object referenced by a variable called generator. Which of the following lines will generate a random number in the range 5-20 and store it in the int variable randNum?

Write an expression that will compute the length of the tangent of a right triangle, given one of the non-right angles. You may assume that this value is stored in a variable called angle.

The Math class is part of the java.lang package.

Explain how variables representing objects and variables representing primitive types are different.

Write a short program that allows the user to input a positive integer and then outputs a randomly generated integer between 1 and the input number.

All of the classes contained in the java.util package are automatically included in every Java program.

The String class _______________________________ .

Enumerated types allow a programmer to treat primitive data as objects.

Write a short program that asks the user to input a string, and then outputs the number of characters in the string.

Explain what it means for a String object to be immutable. Are there any workarounds for this?

A variable that is declared as a primitive type stores the actual value of the associated data. A variable that is declared as an object type stores a pointer to the associated object.

Introduction

Data and Expressions

Conditionals and Loops

Writing Classes

Graphical User Interfaces

Arrays

Inheritance

Polymorphism

Recursion

Exceptions

Searching and Sorting

Trees

Introduction to Collections and Stacks

Heaps and Priority Queues

Graphs

Filters

Which of the following expressions correctly compute 5 + 2⁶?