Deck 6: Arrays

Question 1

The subscript of the first indexed variable in an array is:
(a)0
(b)1
(c)2
(d)3

Answer 1

A

Question 2

The correct syntax for passing an array as an argument in a method is:
(a)a[]
(b)a()
(c)a
(d)a[0]..a[a.length]

Answer 2

C

Question 3

Java provides a looping mechanism for objects of a collection.This looping mechanism is called a __________ loop.
(a)While
(b)For
(c)For each
(d)All of the above

Answer 3

C

Question 4

A ________ loop is a good way to step through the elements of an array and perform some program action on each indexed variable.
(a)while
(b)do…while
(c)for
(d)all of the above

Question 5

A _________ can occur if a programmer allows an accessor method to return a reference to an array instance variable.
(a)short circuit
(b)privacy leak
(c)partially filled array
(d)syntax error

Question 6

A value of an enumerated type is similar to a/an:
(a)Instance variable
(b)Object of a class
(c)Named constant
(d)None of the above

Question 7

The correct syntax for accessing the length of an array named Numbers is:
(a)Numbers.length()
(b)Numbers.length
(c)both A and B
(d)none of the above

Question 8

An ArrayIndexOutOfBounds error is a:
(a)compiler error
(b)syntax error
(c)logic error
(d)all of the above

Question 9

An array has only one public instance variable,which is named length.

Question 10

An arrays length instance variables value can be changed by a program.

Question 11

What is the correct expression for accessing the 5^th element in an array named colors?
(a)colors[3]
(b)colors[4]
(c)colors[5]
(d)colors[6]

Question 12

Which of the following initializer lists correctly initializes the indexed variables of an array named myDoubles?
(a)double myDoubles[double] = {0.0,1.0,1.5,2.0,2.5};
(b)double myDoubles[5] = new double(0.0,1.0,1.5,2.0,2.5);
(c)double[] myDoubles = {0.0,1.0,1.5,2.0,2.5};
(d)array myDoubles[double] = {0.0,1.0,1.5,2.0,2.5};

Question 13

The base type of an array may be all of the following but:
(a)string
(b)boolean
(c)long
(d)all of these may be a base type of an array.

Question 14

An array with more than one index is called a/an:
(a)partially filled array
(b)multidimensional array
(c)bidirectional array
(d)one dimensional array

Question 15

A type of array in which different rows can have different number of columns is called a/an:
(a)partially filled array
(b)ragged array
(c)initialized array
(d)none of the above

Question 16

An array is a collection of variables all of the same type.

Question 17

The name of the sorting algorithm that locates the smallest unsorted value in an array and places it in the next sorted position of the array is called:
(a)bubble sort
(b)merge sort
(c)radix sort
(d)selection sort

Question 18

Partially filled arrays require:
(a)a variable to track the number of array positions used
(b)the use of local variables
(c)the use of global variables
(d)all of the above

Question 19

Consider the following array:
What is the value of myArray[myArray[1] - myArray[0]]
(a)7
(b)9
(c)-3
(d)6

Question 20

The individual variables that together make up the array are referred to as:
(a)indexed variables
(b)subscripted variables
(c)elements of the array
(d)all of the above

Question 21

Declare and create an integer array that will contain the numbers 1 through 100.Use a for loop to initialize the indexed variables.

Question 22

Arrays are objects that are created with new just like class objects.

Question 23

In a vararg specification the ellipsis is not part of the Java syntax.

Question 24

Write a Java method that takes an integer array as a formal parameter and returns the sum of integers contained within the array.

Question 25

A one dimensional array is also called an array of arrays.

Question 26

Write a Java method as well as any facilitator methods needed to perform a sort on an array of whole numbers in descending order.

Question 27

You can only use array indexed variables as arguments to methods.

Question 28

What are three ways you can use the square brackets [ ] with an array name?

Question 29

A variable of an enumerated type can have the special value null.

Question 30

Explain what the main methods array parameter,args,is used for.

Question 31

A collection class is a class whose objects store a collection of values.

Question 32

You may cycle through elements of a collection object using a for loop.

Question 33

An array of chars is the same as a String in Java.

Question 34

Java allows you to declare arrays with more than one index.

Question 35

A method can not change the values stored in the indexed variables of an array argument.

Question 36

How are arrays tested to see if they contain the same contents?

Question 37

An array name references a memory address.

Question 38

Given the following character array
char[] h = {'H','E','L','L','O'};
Write a Java statement that will create a new String object from the character array.

Question 39

Discuss how you could represent a table of related records using a multidimensional array.

Question 40

Write a Java statement that declares and creates an array of Strings named Breeds.Your array should be large enough to hold the names of 100 dog breeds.

Question 41

Declare and create a 10 x 10 multidimensional array of doubles.

Question 42

Write Java statements to create a collection of integers,and to initialize each element of the collection to -1 using a for each statement.

Question 43

Initialize the array created in number 11 above to -1.0.

Question 44

What is the output of the following code?
int[] numbers = new int[10];
for(int i=0; i < numbers.length; ++i)
numbers[i] = i * 2;
for(int i=0; i < numbers.length; ++i)
System.out.print(numbers[i] + " ");
System.out.println();

Question 45

What is the output of the following code?
int[] numbers = new int[10];
for(int i=0; i < numbers.length; ++i)
numbers[i] = i * 2;
for(int i=0; i < numbers.length; ++i)
System.out.print(numbers[i] / 2 + " ");
System.out.println();

Question 46

Write a complete Java console application that prompts the user for a series of quiz scores.The user should type -1 to signify that the input of quiz scores is complete.Your program should then average the scores and display the result back to the user.

Question 47

Declare and create a multidimensional array to hold the first and last names of 10 people.