Question 1

Exception handling helps you create ________ programs.

Accepted Answer

A)  high-performance 
B)  logic-error-free 
C)  fault-tolerant 
D)  compilation-error-free 
A)  high-performance 
B)  logic-error-free 
C)  fault-tolerant 
D)  compilation-error-free

Question 2

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.

Question 3

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 4

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 5

Which of the following statements is false?

Accepted Answer

A)  When an argument is passed by reference, the called method can access the argument's value in the caller directly but cannot modify it. 
B)  All arguments in Java are passed by value. 
C)  To pass an individual array element to a method, use the indexed name of the array. 
D)  To pass an object reference to a method, simply specify in the method call the name of the variable that refers to the object. 
A)  When an argument is passed by reference, the called method can access the argument's value in the caller directly but cannot modify it. 
B)  All arguments in Java are passed by value. 
C)  To pass an individual array element to a method, use the indexed name of the array. 
D)  To pass an object reference to a method, simply specify in the method call the name of the variable that refers to the object.

Question 6

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 7

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 8

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 9

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.

Question 10

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 11

Invalid possibilities for array indices include .

Accepted Answer

A)  Positive integers. 
B)  Negative integers. 
C)  Zero. 
D)  None of the above. 
A)  Positive integers. 
B)  Negative integers. 
C)  Zero. 
D)  None of the above.

Question 12

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 13

A programmer must do the following before using an array:

Accepted Answer

A)  declare then reference the array. 
B)  create then declare the array. 
C)  create then reference the array. 
D)  declare then create the array. 
A)  declare then reference the array. 
B)  create then declare the array. 
C)  create then reference the array. 
D)  declare then create the array.

Question 14

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

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

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 17

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 18

Which of the following statements about arrays are true?
A. An array is a group of variables containing values that all have the same type.
B.Elements are located by index.
C. The length of an array c is determined by the expression c.length();.
D. The zeroth element of array c is specified by c[0].

Accepted Answer

A)  A, C, D. 
B)  A, B, D. 
C)  C, D. 
D)  A, B, C, D. 
A)  A, C, D. 
B)  A, B, D. 
C)  C, D. 
D)  A, B, C, D.

Question 19

Which flag in a format specifier indicates that values with fewer digits than the field width should begin with a leading 0?

Accepted Answer

A)  p. 
B)  l. 
C)  w. 
D)  0. 
A)  p. 
B)  l. 
C)  w. 
D)  0.

Question 20

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

Exam 6: Arrays and Arraylists

Exception handling helps you create ________ programs.

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

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

When an argument is passed by reference, ________.

Which of the following statements is false?

Which of the following will not produce a compiler error?

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

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

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 is true?

Invalid possibilities for array indices include .

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?

A programmer must do the following before using an array:

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:

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

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 flag in a format specifier indicates that values with fewer digits than the field width should begin with a leading 0?

Constant variables also are called .

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

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