Question 1

Assume array items contains the integer values 0, 2, 4, 6 and 8. Which of the following uses the enhanced for loop to display each value in array items?

Accepted Answer

A)  for (int i = 0; i < items.length; i++)
System.out.prinf("%d%n", items[i]); 
B)  for (int i : items)
System.out.prinf("%d%n", items[i]); 
C)  for (int i : items)
System.out.prinf("%d%n", i); 
D)  for (int i = 0 : items.length)
System.out.prinf("%d%n", items[i]); 
A)  for (int i = 0; i < items.length; i++)
System.out.prinf("%d%n", items[i]); 
B)  for (int i : items)
System.out.prinf("%d%n", items[i]); 
C)  for (int i : items)
System.out.prinf("%d%n", i); 
D)  for (int i = 0 : items.length)
System.out.prinf("%d%n", items[i]); C

Question 2

Consider array items, which contains the values 0, 2, 4, 6 and 8. If method changeArray is called with the method call changeArray(items, items[2]), what values are stored in items after the method has finished executing?
Public static void changeArray(int[] passedArray, int value)
{
PassedArray[value] = 12;
Value = 5;
}

Accepted Answer

A)  0, 2, 5, 6, 12. 
B)  0, 2, 12, 6, 8. 
C)  0, 2, 4, 6, 5. 
D)  0, 2, 4, 6, 12. 
A)  0, 2, 5, 6, 12. 
B)  0, 2, 12, 6, 8. 
C)  0, 2, 4, 6, 5. 
D)  0, 2, 4, 6, 12. D

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) C

Question 4

Which of the following statements about creating arrays and initializing their elements is false?

Accepted Answer

A)  The new keyword should be used to create an array. 
B)  When an array is created with operator new, the number of elements must be placed in square brackets following the type of element being stored. 
C)  The elements of an array of integers have a value of null before they are initialized. 
D)  A for loop is commonly used to set the values of the elements of an array. 
A)  The new keyword should be used to create an array. 
B)  When an array is created with operator new, the number of elements must be placed in square brackets following the type of element being stored. 
C)  The elements of an array of integers have a value of null before they are initialized. 
D)  A for loop is commonly used to set the values of the elements of an array.

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

Which statement below initializes array items to contain 3 rows and 2 columns?

Accepted Answer

A)  int[][] items = {{2, 4}, {6, 8}, {10, 12}}; 
B)  int[][] items = {{2, 6, 10}, {4, 8, 12}}; 
C)  int[][] items = {2, 4}, {6, 8}, {10, 12}; 
D)  int[][] items = {2, 6, 10}, {4, 8, 12}; 
A)  int[][] items = {{2, 4}, {6, 8}, {10, 12}}; 
B)  int[][] items = {{2, 6, 10}, {4, 8, 12}}; 
C)  int[][] items = {2, 4}, {6, 8}, {10, 12}; 
D)  int[][] items = {2, 6, 10}, {4, 8, 12};

Question 7

Consider the class below:
Public class Test
{
Public static void main(String[] args)
{
Int[] a = {99, 22, 11, 3, 11, 55, 44, 88, 2, -3};
Int result = 0;
For (int i = 0; i  30)
Result += a[i];
}
System.out.printf("Result is: %d%n", result);
}
}
The output of this Java program will be:

Accepted Answer

A)  Result is: 280. 
B)  Result is: 286. 
C)  Result is: 154. 
D)  Result is: 332. 
A)  Result is: 280. 
B)  Result is: 286. 
C)  Result is: 154. 
D)  Result is: 332.

Question 8

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 9

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 10

The preferred way to traverse a two-dimensional array is to use .

Accepted Answer

A)  a do while statement. 
B)  a for statement. 
C)  two nested for statements. 
D)  three nested for statements. 
A)  a do while statement. 
B)  a for statement. 
C)  two nested for statements. 
D)  three nested for statements.

Question 11

Which of the following statements is false?

Accepted Answer

A)  A primitive-type variable can store exactly one value of its declared type at a time. 
B)  Primitive-type instance variables are initialized by default. 
C)  Variables of types byte, char, short, int, long, float and double are initialized to 0. 
D)  Variables of type boolean are initialized to true. 
A)  A primitive-type variable can store exactly one value of its declared type at a time. 
B)  Primitive-type instance variables are initialized by default. 
C)  Variables of types byte, char, short, int, long, float and double are initialized to 0. 
D)  Variables of type boolean are initialized to true.

Question 12

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 13

Reference-type variables (called references) store ________ in memory.

Accepted Answer

A)  the value of an object 
B)  a copy of an object 
C)  the location of an object 
D)  the size of an object 
A)  the value of an object 
B)  a copy of an object 
C)  the location of an object 
D)  the size of an object

Question 14

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 15

Types in Java are divided into two categories. The primitive types are boolean, byte, char, short, int, long, float and double. All other types are ________ types.

Accepted Answer

A)  static 
B)  reference 
C)  declared 
D)  source 
A)  static 
B)  reference 
C)  declared 
D)  source

Question 16

A(n) ________ indicates a problem that occurs while a program executes.

Accepted Answer

A)  syntax error 
B)  omitted import 
C)  missing semicolon 
D)  exception 
A)  syntax error 
B)  omitted import 
C)  missing semicolon 
D)  exception

Question 17

Consider the code segment below. Which of the following statements is false?
Int[] g;
G = new int[23];

Accepted Answer

A)  The value of g[3] is -1. 
B)  The first statement declares an array reference. 
C)  The second statement creates the array. 
D)  g is a reference to an array of integers. 
A)  The value of g[3] is -1. 
B)  The first statement declares an array reference. 
C)  The second statement creates the array. 
D)  g is a reference to an array of integers.

Question 18

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.

Question 19

Which set of statements totals the items in each row of two-dimensional array items, and displays each row's total?

Accepted Answer

A)  for (int row = 0; row < items.length; row++)
{
Int total = 0;
For (int column = 0; column < items[row].length; column++)
Total += items[row][column];
System.out.printf("Row %d's total is %d%n", row, total);
} 
B)  int total = 0;
For (int row = 0; row < items.length; row++)
{
For (int column = 0; column < items[row].length; column++)
Total += items[row][column];
System.out.printf("Row %d's total is %d%n", row, total);
} 
C)  int total = 0;
For (int row = 0; row < items.length; row++)
{
For (int column = 0; column < items[column].length; column++)
Total += items[row][column];
System.out.printf("Row %d's total is %d%n", row, total);
} 
D)  for (int row = 0; row < items.length; row++)
{
Int total = 0;
For (int column = 0; column < items[column].length; column++)
Total += items[row][column];
System.out.printf("Row %d's total is %d%n", row, total);
} 
A)  for (int row = 0; row < items.length; row++)
{
Int total = 0;
For (int column = 0; column < items[row].length; column++)
Total += items[row][column];
System.out.printf("Row %d's total is %d%n", row, total);
} 
B)  int total = 0;
For (int row = 0; row < items.length; row++)
{
For (int column = 0; column < items[row].length; column++)
Total += items[row][column];
System.out.printf("Row %d's total is %d%n", row, total);
} 
C)  int total = 0;
For (int row = 0; row < items.length; row++)
{
For (int column = 0; column < items[column].length; column++)
Total += items[row][column];
System.out.printf("Row %d's total is %d%n", row, total);
} 
D)  for (int row = 0; row < items.length; row++)
{
Int total = 0;
For (int column = 0; column < items[column].length; column++)
Total += items[row][column];
System.out.printf("Row %d's total is %d%n", row, total);
}

Question 20

When you pass an array or an individual array element of a reference type to a method, the called method receives ________. When you pass an individual element of a primitive type, the called method receives ________.

Accepted Answer

A)  a copy of the element's reference, a copy of the element's reference 
B)  a copy of the element's value, a copy of the element's reference 
C)  a copy of the element's value, a copy of the element's value 
D)  a copy of the element's reference, a copy of the element's value 
A)  a copy of the element's reference, a copy of the element's reference 
B)  a copy of the element's value, a copy of the element's reference 
C)  a copy of the element's value, a copy of the element's value 
D)  a copy of the element's reference, a copy of the element's value

Exam 6: Arrays and Arraylists

Assume array items contains the integer values 0, 2, 4, 6 and 8. Which of the following uses the enhanced for loop to display each value in array items?

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

Which of the following statements about creating arrays and initializing their elements is false?

Which of the following statements is false?

Which statement below initializes array items to contain 3 rows and 2 columns?

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

In Java, multidimensional arrays ________.

The preferred way to traverse a two-dimensional array is to use .

Which of the following statements is false?

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.

Reference-type variables (called references) store ________ in memory.

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

Types in Java are divided into two categories. The primitive types are boolean, byte, char, short, int, long, float and double. All other types are ________ types.

A(n) ________ indicates a problem that occurs while a program executes.

Consider the code segment below. Which of the following statements is false? Int[] g; G = new int[23];

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

Which set of statements totals the items in each row of two-dimensional array items, and displays each row's total?

When you pass an array or an individual array element of a reference type to a method, the called method receives ________. When you pass an individual element of a primitive type, the called method receives ________.

Introduction to Computers and Java

Introduction to Java Applications

Control Statements

Control Statements

Methods

Introduction to Classes and Objects

Classes and Objects: a Deeper Look

Object Oriented Programming: Inheritance

Object-Oriented Programming: Polymorphism

Exception Handling

Gui Components

Graphics and Java 2D

Fundamentals of Characters and Strings

Files, Streams and Object Serialization

Generic Collections

Lambdas

Recursion

Searching, Sorting and Big O

Generic Classes and Methods

Custom Generic Data Structures

GUI

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.

When you pass an array or an individual array element of a reference type to a method, the called method receives . When you pass an individual element of a primitive type, the called method receives .