WGU C949 DATA STRUCTURES AND ALGORITHMS
EXAM 2024 ACTUAL EXAM 2 VERSIONS (VERSION A
AND B) COMPLETE 500 QUESTIONS WITH DETAILED
VERIFIED ANSWERS /ALREADY GRADED A+
What is a data structure? - ANSWER: An arrangement of data inside a computers
memory or a disk.
Name 5 data types - ANSWER: BLASH: binary trees, linked lists, arrays, stacks, hash
tables
What do algorithms do? - ANSWER: Manipulate the data in data structures in various
ways such as sorting.
What is real-world storage data? - ANSWER: Data structure storage that describes
physical entities external to the computer. Accessed by a programs user.
What are programmer's tools? - ANSWER: Data structure storage that is accessed by
the program itself. Ex - stacks and queues.
What is real-world modeling? - ANSWER: Data structures that directly model real-
world situations...think graphs.
What is an object? - ANSWER: A software bundle of variables and related methods.
What is a class? - ANSWER: A blueprint that defines an objects variables and
methods.
The keyword "new" is used to do what? - ANSWER: Create a new object in Java.
An object is often referred to as: - ANSWER: An instance of a class.
object.method(); is and example of - ANSWER: Invoking a method for a specific
object.
Execution of the program starts where? - ANSWER: main()
To create an object in Java you must do two things: - ANSWER: 1. Use the keyword
"new"
2. Store a reference to the object in a variable that is the same type as the class.
So:
Object = new ClassReference();
How do other parts of your program interact with objects? - ANSWER: By interacting
with an objects methods
,What is a constructor? - ANSWER: A special method that is called automatically
whenever a new object is created. It prepares the object for use.
How is the constructor named? - ANSWER: It has the same name as the class it
resides in.
A field of method that is private can only be accessed by - ANSWER: Methods that
are apart of the same class.
Any outside entity that wants to access data in a class can do so by: - ANSWER: Using
a method of that class.
What must be added to all input methods for them to work? - ANSWER: throws
IOException
What does the charAt() method do? - ANSWER: Returns a character at the specific
position in the string object.
What does the parse.Int() method do? - ANSWER: Converts the string type into an
integer.
What is an array? - ANSWER: A container object that holds multiple values of the
same type.
What are the two types of data in java? - ANSWER: Primitive types (int, char,
boolean,long, double etc) and objects.
Why must you use the key word "new" when creating an array? - ANSWER: Arrays in
java are treated as objects.
What does the [] operator tell the compiler? - ANSWER: That we are naming an array
object.
What are the steps to creating an array? - ANSWER: MRCNL: Main(), Reference,
Create an Array, Number of Items, Loop.
long [] arr is; an example of: - ANSWER: Referencing an array.
arr = new long [100];is an example of: - ANSWER: Creating an array.
int nElems = 0; is an example of: - ANSWER: The number of items in the array .
int x; is an example of: - ANSWER: A loop creator.
What does the searchKey variable do? - ANSWER: IT holds the value we are looking
for.
, What are the three steps to delete an item in an array? - ANSWER: 1.Search for the
item
2. Find the item
3. Move the items with a higher index value down to fill the "hole"
First two steps of object-oriented approach? - ANSWER: 1. Separate the data
structure storage from the rest of the program(now called the user).
2. Improve the communication between the storage structure and the user.
Breaking up the program into classes does what? - ANSWER: Makes it easier to
design, understand, modify and maintain the program.
What are the steps to setting up an array class with a constructor? - ANSWER:
RCCSGE: Reference the array, Constructor, Create an Array, Set Value, Get Value,
End Class.
private long[] a; is an example of: - ANSWER: Referencing an array.
public LowArray(int size) is an example of what? Note that LowArray is also the name
of the class. - ANSWER: Creating a Constructor.
{a = new long [size]; } is an example of what? - ANSWER: Creating an array
public void setElement(int index, long value)
{a[index] = value;
is an example of what? - ANSWER: Set value
public long getElem(int index)
{return a[index];}
is an example of what? - ANSWER: Get value
What is public static void main(String args[])? - ANSWER: This is a main() method
with three modifiers
What is meant by public in
public static void main(String args[]) ? - ANSWER: Public indicates that the main()
method can be called by any object.
What is meant by static in
public static void main(String args[]) ? - ANSWER: Static indicates that the main()
method is a class method.
What is meant by void in
EXAM 2024 ACTUAL EXAM 2 VERSIONS (VERSION A
AND B) COMPLETE 500 QUESTIONS WITH DETAILED
VERIFIED ANSWERS /ALREADY GRADED A+
What is a data structure? - ANSWER: An arrangement of data inside a computers
memory or a disk.
Name 5 data types - ANSWER: BLASH: binary trees, linked lists, arrays, stacks, hash
tables
What do algorithms do? - ANSWER: Manipulate the data in data structures in various
ways such as sorting.
What is real-world storage data? - ANSWER: Data structure storage that describes
physical entities external to the computer. Accessed by a programs user.
What are programmer's tools? - ANSWER: Data structure storage that is accessed by
the program itself. Ex - stacks and queues.
What is real-world modeling? - ANSWER: Data structures that directly model real-
world situations...think graphs.
What is an object? - ANSWER: A software bundle of variables and related methods.
What is a class? - ANSWER: A blueprint that defines an objects variables and
methods.
The keyword "new" is used to do what? - ANSWER: Create a new object in Java.
An object is often referred to as: - ANSWER: An instance of a class.
object.method(); is and example of - ANSWER: Invoking a method for a specific
object.
Execution of the program starts where? - ANSWER: main()
To create an object in Java you must do two things: - ANSWER: 1. Use the keyword
"new"
2. Store a reference to the object in a variable that is the same type as the class.
So:
Object = new ClassReference();
How do other parts of your program interact with objects? - ANSWER: By interacting
with an objects methods
,What is a constructor? - ANSWER: A special method that is called automatically
whenever a new object is created. It prepares the object for use.
How is the constructor named? - ANSWER: It has the same name as the class it
resides in.
A field of method that is private can only be accessed by - ANSWER: Methods that
are apart of the same class.
Any outside entity that wants to access data in a class can do so by: - ANSWER: Using
a method of that class.
What must be added to all input methods for them to work? - ANSWER: throws
IOException
What does the charAt() method do? - ANSWER: Returns a character at the specific
position in the string object.
What does the parse.Int() method do? - ANSWER: Converts the string type into an
integer.
What is an array? - ANSWER: A container object that holds multiple values of the
same type.
What are the two types of data in java? - ANSWER: Primitive types (int, char,
boolean,long, double etc) and objects.
Why must you use the key word "new" when creating an array? - ANSWER: Arrays in
java are treated as objects.
What does the [] operator tell the compiler? - ANSWER: That we are naming an array
object.
What are the steps to creating an array? - ANSWER: MRCNL: Main(), Reference,
Create an Array, Number of Items, Loop.
long [] arr is; an example of: - ANSWER: Referencing an array.
arr = new long [100];is an example of: - ANSWER: Creating an array.
int nElems = 0; is an example of: - ANSWER: The number of items in the array .
int x; is an example of: - ANSWER: A loop creator.
What does the searchKey variable do? - ANSWER: IT holds the value we are looking
for.
, What are the three steps to delete an item in an array? - ANSWER: 1.Search for the
item
2. Find the item
3. Move the items with a higher index value down to fill the "hole"
First two steps of object-oriented approach? - ANSWER: 1. Separate the data
structure storage from the rest of the program(now called the user).
2. Improve the communication between the storage structure and the user.
Breaking up the program into classes does what? - ANSWER: Makes it easier to
design, understand, modify and maintain the program.
What are the steps to setting up an array class with a constructor? - ANSWER:
RCCSGE: Reference the array, Constructor, Create an Array, Set Value, Get Value,
End Class.
private long[] a; is an example of: - ANSWER: Referencing an array.
public LowArray(int size) is an example of what? Note that LowArray is also the name
of the class. - ANSWER: Creating a Constructor.
{a = new long [size]; } is an example of what? - ANSWER: Creating an array
public void setElement(int index, long value)
{a[index] = value;
is an example of what? - ANSWER: Set value
public long getElem(int index)
{return a[index];}
is an example of what? - ANSWER: Get value
What is public static void main(String args[])? - ANSWER: This is a main() method
with three modifiers
What is meant by public in
public static void main(String args[]) ? - ANSWER: Public indicates that the main()
method can be called by any object.
What is meant by static in
public static void main(String args[]) ? - ANSWER: Static indicates that the main()
method is a class method.
What is meant by void in
