Question 1

An argument type followed by a(n) in a method's parameter list indicates that the method receives a variable number of arguments of that particular type.

Accepted Answer

A)  square brackets ([]) 
B)  ellipsis (...) 
C)  varargs keyword 
D)  All of the above are acceptable to indicate a variable number of arguments. 
A)  square brackets ([]) 
B)  ellipsis (...) 
C)  varargs keyword 
D)  All of the above are acceptable to indicate a variable number of arguments. B

Question 2

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}}; B

Question 3

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. C

Question 4

Which of the following will not produce a compiler error?

Accepted Answer

A)  Changing the value of a constant after it is initialized. 
B)  Changing the value at a given index of an array after it is created. 
C)  Using a final variable before it is initialized. 
D)  All of the above will produce compiler errors. 
A)  Changing the value of a constant after it is initialized. 
B)  Changing the value at a given index of an array after it is created. 
C)  Using a final variable before it is initialized. 
D)  All of the above will produce compiler errors.

Question 5

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 6

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 7

An exception object's ________ method returns the exception's error message.

Accepted Answer

A)  String 
B)  Message 
C)  Error 
D)  toString 
A)  String 
B)  Message 
C)  Error 
D)  toString

Question 8

Consider the array:
 s[0] = 7
S[1] = 0
S[2] = -12
S[3] = 9
S[4] = 10
S[5] = 3
S[6] = 6
The value of s[s[6] - s[5]] is:

Accepted Answer

A)  0. 
B)  3. 
C)  9. 
D)  10. 
A)  0. 
B)  3. 
C)  9. 
D)  10.

Question 9

Attempting to access an array element outside of the bounds of an array, causes a(n) .

Accepted Answer

A)  ArrayOutOfBoundsException. 
B)  ArrayElementOutOfBoundsException. 
C)  ArrayIndexOutOfBoundsException. 
D)  ArrayException. 
A)  ArrayOutOfBoundsException. 
B)  ArrayElementOutOfBoundsException. 
C)  ArrayIndexOutOfBoundsException. 
D)  ArrayException.

Question 10

In array items, which expression below accesses the value at row 3 and column 4?

Accepted Answer

A)  items[3].[4] 
B)  items[3[4]] 
C)  items[3][4] 
D)  items[3, 4] 
A)  items[3].[4] 
B)  items[3[4]] 
C)  items[3][4] 
D)  items[3, 4]

Question 11

Class Arrays provides method __________ for comparing arrays to determine whether they have the same contents.

Accepted Answer

A)  compare 
B)  compares 
C)  equal 
D)  equals 
A)  compare 
B)  compares 
C)  equal 
D)  equals

Question 12

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 13

Constant variables also are called .

Accepted Answer

A)  write-only variables 
B)  finals 
C)  named constants 
D)  All of the above 
A)  write-only variables 
B)  finals 
C)  named constants 
D)  All of the above

Question 14

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 15

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 16

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 17

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.

Question 18

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]);
}

Question 19

For tthe 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 20

Class ________ represents a dynamically resizable array-like data structure.

Accepted Answer

A)  Array 
B)  ArrayList 
C)  Arrays 
D)  None of the above. 
A)  Array 
B)  ArrayList 
C)  Arrays 
D)  None of the above.

Exam 7: Arrays and Arraylists

An argument type followed by a(n) in a method's parameter list indicates that the method receives a variable number of arguments of that particular type.

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 true?

Which of the following will not produce a compiler error?

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

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

An exception object's ________ method returns the exception's error message.

Consider the array: s[0] = 7 S[1] = 0 S[2] = -12 S[3] = 9 S[4] = 10 S[5] = 3 S[6] = 6 The value of s[s[6] - s[5]] is:

Attempting to access an array element outside of the bounds of an array, causes a(n) .

In array items, which expression below accesses the value at row 3 and column 4?

Class Arrays provides method __________ for comparing arrays to determine whether they have the same contents.

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

Constant variables also are called .

Which of the following statements is false?

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

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.

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?

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

Class ________ represents a dynamically resizable array-like data structure.

Introduction to Computers, the Internet and Java

Introduction to Java Applications; Inputoutput and Operators

Introduction to Classes, Objects, Methods and Strings

Control Statements: Assignment, and Operators

Control Statements: Logical Operators

Methods: a Deeper Look

Classes and Objects: a Deeper Look

Object-Oriented Programming: Inheritance

Object-Oriented Programming: Polymorphism and Interfaces

Exception Handling: a Deeper Look

Javafx Graphical User Interfaces

Javafx Gui

Strings, Characters and Regular Expressions

Files, Inputoutput Streams, Nio and Xml Serialization

Generic Collections

Lambdas and Streams

Recursion

Searching, Sorting and Big O

Generic Classes and Methods: a Deeper Look

Custom Generic Data Structures

Concurrency

Accessing Databases With Jdbc

Swing Gui Components

Graphics and Java 2d

Networking

Java Persistence Api Jpa

Javaserver Faces Web Apps

Javaserver Faces Web Apps

Swing Gui Components

Filters