Question 1

When an argument is passed by reference,________.

Accepted Answer

A) a copy of the argument's value is passed to the called method 
B) changes to the argument do not affect the original variable's value in the caller 
C) the called method can access the argument's value in the caller directly and modify that data 
D) the original value is removed from memory 
A) a copy of the argument's value is passed to the called method 
B) changes to the argument do not affect the original variable's value in the caller 
C) the called method can access the argument's value in the caller directly and modify that data 
D) the original value is removed from memory

Question 2

Assume class Book has been declared.Which set of statements creates an array of Books?

Accepted Answer

A) 
Book[] books;
Books = new Book[numberElements]; 
B) 
Book[] books];
Books = new Book()[numberElements]; 
C) 
New Book()books[];
Books = new Book[numberElements]; 
D) All of the above. 
A) 
Book[] books;
Books = new Book[numberElements]; 
B) 
Book[] books];
Books = new Book()[numberElements]; 
C) 
New Book()books[];
Books = new Book[numberElements]; 
D) All of the above.

Question 3

Which method call converts the value in variable stringVariable to an integer?

Accepted Answer

A) Convert.toInt(stringVariable) 
B) Convert.parseInt(stringVariable) 
C) Integer.parseInt(stringVariable) 
D) Integer.toInt(stringVariable) 
A) Convert.toInt(stringVariable) 
B) Convert.parseInt(stringVariable) 
C) Integer.parseInt(stringVariable) 
D) Integer.toInt(stringVariable)

Question 4

Which of the following statements creates a multidimensional array with 3 rows,where the first row contains 1 element,the second row contains 4 elements and the final row contains 2 elements?

Accepted Answer

A) int[][] items = {{1,null,null,null},{2,3,4,5},{6,7,null,null}}; 
B) int[][] items = {{1},{2,3,4,5},{6,7}}; 
C) int[][] items = {{1},{2,3,4,5},{6,7},{}); 
D) int[][] items = {{1},{4},{2}}; 
A) int[][] items = {{1,null,null,null},{2,3,4,5},{6,7,null,null}}; 
B) int[][] items = {{1},{2,3,4,5},{6,7}}; 
C) int[][] items = {{1},{2,3,4,5},{6,7},{}); 
D) int[][] items = {{1},{4},{2}};

Question 5

Which of the following statements is false?

Accepted Answer

A) An exception indicates a problem that occurs while a program executes. 
B) Exception handling enables you to create fault-tolerant programs that can resolve (or handle)exceptions-in many cases,this allows a program to continue executing as if no problems were encountered. 
C) The catch block contains the code that might throw an exception,and the try block contains the code that handles the exception if one occurs. 
D) Inside the catch block,you can use the parameter's identifier to interact with a caught exception object. 
A) An exception indicates a problem that occurs while a program executes. 
B) Exception handling enables you to create fault-tolerant programs that can resolve (or handle)exceptions-in many cases,this allows a program to continue executing as if no problems were encountered. 
C) The catch block contains the code that might throw an exception,and the try block contains the code that handles the exception if one occurs. 
D) Inside the catch block,you can use the parameter's identifier to interact with a caught exception object.

Question 6

What do the following statements do?
Double[] array;
Array = new double[14];

Accepted Answer

A) Create a double array containing 13 elements. 
B) Create a double array containing 14 elements. 
C) Create a double array containing 15 elements. 
D) Declare but do not create a double array. 
A) Create a double array containing 13 elements. 
B) Create a double array containing 14 elements. 
C) Create a double array containing 15 elements. 
D) Declare but do not create a double array.

Question 7

How many Book objects are created by the following statement?
Book[] books = new Book[10];

Accepted Answer

A) 10 
B) 0 
C) 5 
D) None of the above. 
A) 10 
B) 0 
C) 5 
D) None of the above.

Question 8

In Java,multidimensional arrays ________.

Accepted Answer

A) are not directly supported. 
B) are implemented as arrays of arrays. 
C) are often used to represent tables of values. 
D) All of the above. 
A) are not directly supported. 
B) are implemented as arrays of arrays. 
C) are often used to represent tables of values. 
D) All of the above.

Question 9

Which expression adds 1 to the element of array arrayName at index i?

Accepted Answer

A) ++arrayName[i]. 
B) arrayName++[i]. 
C) arrayName[i++]. 
D) None of the above. 
A) ++arrayName[i]. 
B) arrayName++[i]. 
C) arrayName[i++]. 
D) None of the above.

Question 10

Which of the following is false?

Accepted Answer

A) The size of an ArrayList can be determined via its length instance variable. 
B) The size of an ArrayList can be determined via its size method. 
C) You can add a new item to the end of an ArrayList with its add method. 
D) You can get an item from a specified index in an ArrayList with its get method. 
A) The size of an ArrayList can be determined via its length instance variable. 
B) The size of an ArrayList can be determined via its size method. 
C) You can add a new item to the end of an ArrayList with its add method. 
D) You can get an item from a specified index in an ArrayList with its get method.

Question 11

Arrays are ________.

Accepted Answer

A) variable-length entities 
B) fixed-length entities 
C) data structures that contain up to 10 related data items 
D) used to draw a sequence of lines,or "rays" 
A) variable-length entities 
B) fixed-length entities 
C) data structures that contain up to 10 related data items 
D) used to draw a sequence of lines,or "rays"

Question 12

Which of the following initializer lists would correctly set the elements of array n?

Accepted Answer

A) int[] n = {1,2,3,4,5};. 
B) array n[int] = {1,2,3,4,5};. 
C) int n[5] = {1;2;3;4;5};. 
D) int n = new int(1,2,3,4,5);. 
A) int[] n = {1,2,3,4,5};. 
B) array n[int] = {1,2,3,4,5};. 
C) int n[5] = {1;2;3;4;5};. 
D) int n = new int(1,2,3,4,5);.

Question 13

An array with m rows and n columns is not ________.
a)an m-by-n array.
b)an n-by-m array.
c)a two-dimensional array.
d)a dual-transcripted array.

Accepted Answer

A) A and C. 
B) A and D. 
C) B and D. 
D) B and C. 
A) A and C. 
B) A and D. 
C) B and D. 
D) B and C.

Question 14

Which method sets the background color of a JPanel?

Accepted Answer

A) setBack. 
B) setBackground. 
C) setBackgroundColor. 
D) setColor. 
A) setBack. 
B) setBackground. 
C) setBackgroundColor. 
D) setColor.

Question 15

Which statement correctly passes the array items to method takeArray? Array items contains 10 elements.

Accepted Answer

A) takeArray(items[]). 
B) takeArray(items). 
C) takeArray(items[9]). 
D) Arrays cannot be passed to methods-each item must be sent to the method separately. 
A) takeArray(items[]). 
B) takeArray(items). 
C) takeArray(items[9]). 
D) Arrays cannot be passed to methods-each item must be sent to the method separately.

Question 16

Which command below runs TestProgram,and passes in the values files.txt and 3?

Accepted Answer

A) java TestProgram files.txt 3. 
B) java TestProgram files.txt,3. 
C) java TestProgram "files.txt","3". 
D) None of the above. 
A) java TestProgram files.txt 3. 
B) java TestProgram files.txt,3. 
C) java TestProgram "files.txt","3". 
D) None of the above.

Question 17

Class Arrays methods sort,binarySearch,equals and fill are overloaded for primitive-type arrays and Object arrays.In addition,methods __________ and __________ are overloaded with generic versions.

Accepted Answer

A) sort,binarySearch. 
B) sort,fill. 
C) binarySearch,equals. 
D) binarySearch,fill. 
A) sort,binarySearch. 
B) sort,fill. 
C) binarySearch,equals. 
D) binarySearch,fill.

Question 18

What kind of application tests a class by creating an object of that class and calling the class's methods?

Accepted Answer

A) Pseudo application. 
B) Debugger. 
C) Declarator. 
D) Test harness. 
A) Pseudo application. 
B) Debugger. 
C) Declarator. 
D) Test harness.

Question 19

Which of the following statements is true?

Accepted Answer

A) The catch block contains the code that might throw an exception. 
B) The try block contains the code that handles the exception if one occurs. 
C) You can have many catch blocks to handle different types of exceptions. 
D) When a try block terminates,any variables declared in the try block are preserved. 
A) The catch block contains the code that might throw an exception. 
B) The try block contains the code that handles the exception if one occurs. 
C) You can have many catch blocks to handle different types of exceptions. 
D) When a try block terminates,any variables declared in the try block are preserved.

Question 20

For the array that was the correct answer in the previous question,what is the value returned by items[1][0]?

Accepted Answer

A) 4. 
B) 8. 
C) 12. 
D) 6. 
A) 4. 
B) 8. 
C) 12. 
D) 6.

Exam 7: Arrays and Arraylists

When an argument is passed by reference,________.

Assume class Book has been declared.Which set of statements creates an array of Books?

Which method call converts the value in variable stringVariable to an integer?

Which of the following statements creates a multidimensional array with 3 rows,where the first row contains 1 element,the second row contains 4 elements and the final row contains 2 elements?

Which of the following statements is false?

What do the following statements do? Double[] array; Array = new double[14];

How many Book objects are created by the following statement? Book[] books = new Book[10];

In Java,multidimensional arrays ________.

Which expression adds 1 to the element of array arrayName at index i?

Which of the following is false?

Arrays are ________.

Which of the following initializer lists would correctly set the elements of array n?

An array with m rows and n columns is not ________. a)an m-by-n array. b)an n-by-m array. c)a two-dimensional array. d)a dual-transcripted array.

Which method sets the background color of a JPanel?

Which statement correctly passes the array items to method takeArray? Array items contains 10 elements.

Which command below runs TestProgram,and passes in the values files.txt and 3?

Class Arrays methods sort,binarySearch,equals and fill are overloaded for primitive-type arrays and Object arrays.In addition,methods __________ and __________ are overloaded with generic versions.

What kind of application tests a class by creating an object of that class and calling the class's methods?

Which of the following statements is true?

For the array that was the correct answer in the previous question,what is the value returned by items[1][0]?

Introduction to Computers and Java

Introduction to Java Applications

Introduction to Classes and Objects

Control Statements: Part 1

Control Statements: Part 2

Methods: a Deeper Look

Classes and Objects: a Deeper Look

Object Oriented Programming: Inheritance

Object-Oriented Programming: Polymorphism

Exception Handling

Gui Components: Part 1

Graphics and Java 2D

Strings

Files,streams and Object Serialization

Generic Collections

Lambdas

Recursion

Searching, Sorting and Big O

Generic Classes and Methods

Custom Generic Data Structures

Concurrency

Accessing Databases With Jdbc

JavaFX

Filters

Class Arrays methods sort,binarySearch,equals and fill are overloaded for primitive-type arrays and Object arrays.In addition,methods and are overloaded with generic versions.