Question 1

The EmptyQueueException is associated with the action of attempting to remove an item from an empty queue.

Accepted Answer

False

Question 2

In computer science, queues are used in operating systems to keep track of tasks waiting for a scarce resource and to ensure that the tasks are carried out in the order that they were generated.

Accepted Answer

Queues in computer science are indeed used in operating systems for managing tasks waiting for resources, ensuring that tasks are executed in the order they were received, adhering to a First-In, First-Out (FIFO) principle.

Question 3

A double-linked list requires the same amount of storage as that of a single-linked l ist.

Accepted Answer

A double-linked list requires more storage than a single-linked list because each node in a double-linked list must store two references (to both the next and the previous node) instead of one.

Question 4

Although reallocating an array is an O(n) operation, it is amortized over n items, so the cost per item is O(n²).

Accepted Answer

Reallocating an array is indeed an O(n) operation, but when amortized over n items, the cost per item becomes O(1), not O(n). This is because, although reallocations can be expensive, they happen less frequently as the array grows.

Question 5

You can implement a queue as a single-linked list.

Accepted Answer

A queue can be implemented using a single-linked list by maintaining two pointers, one for the front of the queue and one for the rear. This allows for efficient enqueue (insertion at the rear) and dequeue (removal from the front) operations.

Question 6

A(n) _____________________ is a data structure in which objects are inserted at one end and removed from the other.

Accepted Answer

The answer of A(n) _____________________ is a data structure in...

Question 7

Removal from the front of a queue is a(n) ____________________ operation.

Accepted Answer

The answer of Removal from the front of a queue...

Question 8

If a LinkedList is used, insertion at the rear of a queue is a(n) ____________________ operation.

Accepted Answer

The answer of If a LinkedList is used, insertion at...

Question 9

If the queue is empty, element method throws a(n) ____________________ exception.

Accepted Answer

The answer of If the queue is empty, element method...

Question 10

Because interface Queue extends interface ____, a full implementation of the Queue interface must implement all required methods of that interface.

Accepted Answer

The answer of Because interface Queue extends interface ____, a...

Question 11

The ____________________ method creates a Random object when it is first called. It then uses that object's nextDouble method to return a random number in the range 0 to 1.

Accepted Answer

The answer of The ____________________ method creates a Random object...

Question 12

In a(n) ____________________ array, the elements wrap around so that the first element actually follows the last.

Accepted Answer

The answer of In a(n) ____________________ array, the elements wrap...

Question 13

If an array is used to implement a Queue, insertion at the rear of the array can be done in ____________________ time.

Accepted Answer

The answer of If an array is used to implement...

Question 14

Through ____________________, the designers of a new system can estimate the expected performance of the system before they actually build it.

Accepted Answer

The answer of Through ____________________, the designers of a new...

Question 15

____________________ is a technique used to study the performance of a physical system by using a physical, mathematical, or computer model of the system.

Accepted Answer

The answer of ____________________ is a technique used to study...

Question 16

When a queue is implemented using a circular array, removal from the rear is ____. A) O(n) B) O(1) C) O(n²) D) O(log n)

Accepted Answer

In a circular array implementation of a queue, removal (and addition) of elements at the front (or rear, depending on the implementation) is O(1) because it involves updating the front or rear pointer and does not require shifting elements.

Question 17

When a queue is implemented using a circular array, insertion at the front is ____. A) O(1) B) O(log²n) C) O(log n) D) O(n)

Accepted Answer

Insertion at the front of a queue implemented using a circular array is O(1) because it only involves updating the index that points to the front of the queue, which is a constant time operation.

Question 18

Complete the following code: /** Returns the next element in the queue. Pre: index references the next element to access. Post: index and count are incremented. @return The element with subscript index */ Public E next() { If (!hasNext()) { ____ } E returnValue = theData[index]; Index = (index + 1) % capacity; Count++; Return returnValue; } A) throw new NoSuchElementException(); B) throw new StackException(); C) throw new EmptyStackException(); D) throw new EmptyListException();

Accepted Answer

When implementing a method that fetches the next element from a collection, such as a queue, and there are no more elements to return, it is conventional to throw a NoSuchElementException. This exception accurately represents the situation where an attempt is made to access an element that does not exist, which aligns with the behavior described in the provided code snippet.

Question 19

Complete the following code: /** Returns the item at the front of the queue without removing it. @return The item at the front if successful; null if not */ Public E ____() { If (size() == 0) Return null; Else Return theQueue.getFirst(); } A) poll B) element C) remove D) peek

Accepted Answer

The correct method name is "peek" because it returns the item at the front of the queue without removing it, which matches the behavior described in the comment.

Question 20

Complete the following code. /** Insert an item at the rear of the queue. Post: item is added to the rear of the queue. @param item The element to add @return true (always successful) */ Public boolean ____(E item) { // Check for empty queue. If (front == null) { Rear = new Node(item); Front = rear; } else { // Allocate a new node at end, store item in it, and // link it to old end of queue. Rear.next = new Node(item); Rear = rear.next; } Size++; Return true; } A) offer B) remove C) peek D) getSize

Accepted Answer

The method described is adding an item to the rear of the queue, which is what the `offer` method does in queue implementations.

Quiz 4: Stacks and Queues

The EmptyQueueException is associated with the action of attempting to remove an item from an empty queue.

In computer science, queues are used in operating systems to keep track of tasks waiting for a scarce resource and to ensure that the tasks are carried out in the order that they were generated.

A double-linked list requires the same amount of storage as that of a single-linked l ist.

Although reallocating an array is an O(n) operation, it is amortized over n items, so the cost per item is O(n²).

You can implement a queue as a single-linked list.

A(n) _____________________ is a data structure in which objects are inserted at one end and removed from the other.

Removal from the front of a queue is a(n) ____________________ operation.

If a LinkedList is used, insertion at the rear of a queue is a(n) ____________________ operation.

If the queue is empty, element method throws a(n) ____________________ exception.

Because interface Queue extends interface ____, a full implementation of the Queue interface must implement all required methods of that interface.

The ____________________ method creates a Random object when it is first called. It then uses that object's nextDouble method to return a random number in the range 0 to 1.

In a(n) ____________________ array, the elements wrap around so that the first element actually follows the last.

If an array is used to implement a Queue, insertion at the rear of the array can be done in ____________________ time.

Through ____________________, the designers of a new system can estimate the expected performance of the system before they actually build it.

____________________ is a technique used to study the performance of a physical system by using a physical, mathematical, or computer model of the system.

When a queue is implemented using a circular array, removal from the rear is ____.

When a queue is implemented using a circular array, insertion at the front is ____.

Complete the following code: */** Returns the item at the front of the queue without removing it. @return The item at the front if successful; null if not / Public E ____() { If (size() == 0) Return null; Else Return theQueue.getFirst() ; }

Quiz 4: Stacks and Queues

The EmptyQueueException is associated with the action of attempting to remove an item from an empty queue.

In computer science, queues are used in operating systems to keep track of tasks waiting for a scarce resource and to ensure that the tasks are carried out in the order that they were generated.

A double-linked list requires the same amount of storage as that of a single-linked l ist.

Although reallocating an array is an O(n) operation, it is amortized over n items, so the cost per item is O(n2).

You can implement a queue as a single-linked list.

A(n) _____________________ is a data structure in which objects are inserted at one end and removed from the other.

Removal from the front of a queue is a(n) ____________________ operation.

If a LinkedList is used, insertion at the rear of a queue is a(n) ____________________ operation.

If the queue is empty, element method throws a(n) ____________________ exception.

Because interface Queue extends interface ____, a full implementation of the Queue interface must implement all required methods of that interface.

The ____________________ method creates a Random object when it is first called. It then uses that object's nextDouble method to return a random number in the range 0 to 1.

In a(n) ____________________ array, the elements wrap around so that the first element actually follows the last.

If an array is used to implement a Queue, insertion at the rear of the array can be done in ____________________ time.

Through ____________________, the designers of a new system can estimate the expected performance of the system before they actually build it.

____________________ is a technique used to study the performance of a physical system by using a physical, mathematical, or computer model of the system.

When a queue is implemented using a circular array, removal from the rear is ____.

When a queue is implemented using a circular array, insertion at the front is ____.

Complete the following code: /** Returns the item at the front of the queue without removing it. @return The item at the front if successful; null if not */ Public E ____() { If (size() == 0) Return null; Else Return theQueue.getFirst() ; }

Although reallocating an array is an O(n) operation, it is amortized over n items, so the cost per item is O(n²).

Complete the following code: */** Returns the item at the front of the queue without removing it. @return The item at the front if successful; null if not / Public E ____() { If (size() == 0) Return null; Else Return theQueue.getFirst() ; }