Deck 8: Arrays

Question 1

Many programmers feel that breaking out of a for loop early disrupts the loop flow and makes the code harder to understand.

Answer 1

True

Question 2

Languages such as Visual Basic, BASIC, and COBOL use ____ to refer to individual array elements.

A) ( )
B) [ ]
C) { }
D) < >

Answer 2

A

Question 3

Providing values for all the elements in an array is called ____ the array.

A) populating
B) declaring
C) filling
D) irrigating

Answer 3

A

Question 4

After you create an array variable, you still need to ____ memory space.

A) create
B) organize
C) reserve
D) dump

Question 5

When you create an array variable, memory space is automatically reserved.

Question 6

When you create an array of objects, each reference is assigned the value ____.

A) null
B) '\u0000'
C) true
D) false

Question 7

When returning an array reference, square brackets are included with the return type in the method header.

Question 8

When array elements are passed by value, a copy of the value is made and used within the receiving method.

Question 9

You use a ____ following the closing brace of an array initialization list.

A) .
B) ;
C) :
D) ,

Question 10

When you want to determine whether a variable holds one of many valid values, one option is to use a do…while loop to compare the variable to a series of valid values.

Question 11

A(n) ____ is an integer contained within square brackets that indicates one of an array's variables.

A) postscript
B) subscript
C) variable header
D) indicator

Question 12

When initializing an array, you must initialize all elements or none.

Question 13

You can declare an array variable by placing curly brackets after the array name.

Question 14

In Java, boolean array elements automatically are assigned the value ____.

A) null
B) '\u0000'
C) true
D) false

Question 15

When using parallel arrays, if one array has many possible matches, it is most efficient to place the less common items first so that they are matched right away.

Question 16

In Java, the size of an array ____ declared immediately following the array name.

A) can be
B) is always
C) is never
D) should be

Question 17

When any ____ type (boolean, char, byte, short, int, long, float, or double) is passed to a method, the value is passed.

A) array
B) dummy
C) element
D) primitive

Question 18

Since an array name is a reference, you are able to use the = operator for assigning and the == operator for comparisons.

Question 19

When an application contains an array and you want to use every element of the array in some task, it is common to perform loops that vary the loop control variable from 0 to one less than the size of the array.

Question 20

When you declare an array name, no computer memory address is assigned to it. Instead, the array variable name has the special value ____, or Unicode value '\u0000'.

A) empty
B) null
C) false
D) zero

Question 21

An instance variable or object field is also called a(n) ____________________ of the object.

Question 22

When a method returns an array reference, you include ____ with the return type in the method header.

A) { }
B) ( )
C) < >
D) [ ]

Question 23

A ____ array is one with the same number of elements as another, and for which the values in corresponding elements are related.

A) cloned
B) parallel
C) property
D) two-dimensional

Question 24

Individual array elements are ____ by value when a copy of the value is made and used within the receiving method.

A) sorted
B) passed
C) received
D) stored

Question 25

Which of the following statements correctly initializes an array with an initialization list?

A) int[] nums = {2, 4, 8};
B) int[] nums = (2, 4, 8);
C) int nums = [2, 4, 8];
D) int nums() = int{2, 4, 8}

Question 26

When you declare int[] someNums = new int[10];, each element of someNums has a value of ____________________ because someNums is a numeric array.

Question 27

In which of the following statements is the value of myVals null?

A) int myVals = ""
B) int [] myVals;
C) myVals = int[null]
D) int[null] = myVals

Question 28

When you initialize parallel arrays, it is convenient to use ____ so that the values that correspond to each other visually align on the screen or printed page.

A) tabs
B) indentation
C) spacing
D) dashes

Question 29

When any primitive type is passed to a method, the ____________________ is passed.

Question 30

A(n) ____ loop allows you to cycle through an array without specifying the starting and ending points for the loop control variable.

A) do…while
B) inner
C) enhanced for
D) enhanced while

Question 31

Which of the following statements correctly declares and creates an array to hold five double scores values?

A) integer[] scores = new double[5]
B) double[] scores = new integer[5]
C) double[] = new scores[5]
D) double[] scores = new double[5]

Question 32

When you declare or access an array, you can use any expression to represent the size, as long as the expression is a(n) ____________________.

Question 33

A(n) ____________________ is a named list of data items that all have the same type.

Question 34

Primitive type variables are always passed by ____.

A) value
B) reference
C) location
D) memory

Question 35

If a class has only a default constructor, you must call the constructor using the keyword ____ for each declared array element.

A) default
B) new
C) first
D) object

Question 36

Comparing a variable to a list of values in an array is a process called ____ an array.

A) validating
B) using
C) checking
D) searching

Question 37

The length ____ contains the number of elements in the array.

A) box
B) field
C) area
D) block

Question 38

When you perform a ____, you compare a value to the endpoints of numerical ranges to find the category in which a value belongs.

A) range match
B) sort
C) reference
D) search

Question 39

Which of the following println statements will display the last myScores element in an array of 10?

A) System.out.println(vals[0]);
B) System.out.println(vals[1]);
C) System.out.println(vals[9]);
D) System.out.println(vals[10]);

Question 40

It is a good programming practice to ensure that a subscript to an array does not fall below zero, causing a(n) ____.

A) array dump
B) runtime error
C) conundrum
D) compiling error

Question 41

How can you use the enhanced for loop?

Question 42

Match each term with the correct statement below.
a.array variable
f.length
b.reference type
g.foreach loop
c.elements
h.reference types
d.int
i.return
e.Java object names
A primitive type

Question 43

Match each term with the correct statement below.
a.array variable
f.length
b.reference type
g.foreach loop
c.elements
h.reference types
d.int
i.return
e.Java object names
Numbered beginning with 0

Question 44

Match each term with the correct statement below.
a.array variable
f.length
b.reference type
g.foreach loop
c.elements
h.reference types
d.int
i.return
e.Java object names
Declared in the same way you declare any simple variable

Question 45

Match each term with the correct statement below.
a.array variable
f.length
b.reference type
g.foreach loop
c.elements
h.reference types
d.int
i.return
e.Java object names
A statement used to return an array from a method

Question 46

How would a programmer perform a range match when writing an application that takes into consideration different discount rates for customers? Give an example.

Question 47

What does an array's name represent and what value does it hold when declared?

Question 48

What is different about passing an array to a method rather than passing a primitive type to a method?

Question 49

When using an array with all elements used, why would a programmer use a loop control variable from 0 to one less than the size of the array? Give an example.

Question 50

Match each term with the correct statement below.
a.array variable
f.length
b.reference type
g.foreach loop
c.elements
h.reference types
d.int
i.return
e.Java object names
Represent computer memory addresses

Question 51

When working with arrays, why is it beneficial to use a loop with a declared symbolic constant equal to the size of the array?

Question 52

When populating an array with an initialization list, you do not need to use the new keyword or provide an array size. Explain why this is the case.

Question 53

Describe a situation in which storing just one value at a time in memory does not meet your needs.

Question 54

Match each term with the correct statement below.
a.array variable
f.length
b.reference type
g.foreach loop
c.elements
h.reference types
d.int
i.return
e.Java object names
Hold memory addresses where values are stored

Question 55

Match each term with the correct statement below.
a.array variable
f.length
b.reference type
g.foreach loop
c.elements
h.reference types
d.int
i.return
e.Java object names
An enhanced for loop

Question 56

How would you use a method that belongs to an object that is part of the array? Use an example and demonstrate with Java code.

Question 57

Match each term with the correct statement below.
a.array variable
f.length
b.reference type
g.foreach loop
c.elements
h.reference types
d.int
i.return
e.Java object names
An array field

Question 58

What is a subscript and how are the array's elements numbered?

Question 59

Match each term with the correct statement below.
a.array variable
f.length
b.reference type
g.foreach loop
c.elements
h.reference types
d.int
i.return
e.Java object names
A nonprimitive object

Question 60

Why would you use spacing when initializing parallel arrays?

Question 61

Using just one statement, declare and create an array that will reserve memory locations for 10 scores values that are type double.

Question 62

String[] countyNames = {"Clark", "Delaware", "Madison"};
Using the above statement, what will be the value of countyNames[0], countyNames[1], and countyNames[2]?

Question 63

public static int[] sampleArray()
{
int studentScores = {72, 91, 83};
____
}
Using the above code, write the statement that will return the array name.

Question 64

double[] studentScores;
double studentScores[];
Are both of the above statements valid for declaring an array variable? Why or why not?

Question 65

Write the statement to declare an array variable named studentScores with type double. Write a second statement to create an array of 10 objects.

Question 66

public class CostArray
{
public static void main(String[] args)
{
double[] costs = new double[3];
costs[0] = 5.00;
costs[1] = 7.00;
costs[2] = 9.00;
System.out.println(costs[3]);
}
}
Once the above code is compiled and executed, an error message is generated. Explain the error message that will result and explain the reason for the error.

Question 67

Write the statement to create an array named studentScores that will store five integer value student scores. Initialize the array using an initialization list with the values 70, 85, 92, 67, and 76.

Question 68

String[] countyNames = {"Clark", "Delaware", "Madison"};
What will be the value of countyNames[0].length(), countyNames[1].length(), and countyNames[2].length()?

Question 69

While you can provide any legal identifier you want for an array, conventional rules are typically followed. List and describe the naming conventions for naming arrays.

Question 70

double[] studentScores = new double[3];
studentScores[0] = 93;
studentScores[1] = 77;
studentScores[2] = 85;
Write a println statement to display the last element of the studentScores array.

Question 71

Write the statement to declare an array of integers that will hold studentScores.

Question 72

int[] sixNumbers = {1, 2, 3, 4};
The above code creates an array named sixNumbers. Describe how array sizes are determined when using an initialization list and how memory is assigned.

Question 73

The following statement declares an array:
int[] increaseValues = new int[5]
final int PLUSTWO = 2;
Create a loop that will add 2 to every array element. Use a symbolic constant named PLUSTWO and use the length field in the loop that will contain the number of elements in the array.

Question 74

Why is the length field a good option when writing a loop that manipulates an array? What programming error is common when attempting to use length as an array method?