If N represents the number of elements in the queue, then the size method of the ArrayBoundedQueue class is O(N).
If N represents the number of elements in the queue, then the size method of the ArrayBoundedQueue class is O(N).
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
Related questions
Question
determine if the statement is true or false
If N represents the number of elements in the queue, then the size method of the ArrayBoundedQueue class is O(N).
![```java
public class ArrayBoundedQueue<T> implements QueueInterface<T>
{
protected final int DEFCAP = 100; // default capacity
protected T[] elements; // array that holds queue elements
protected int numElements = 0; // number of elements in this queue
protected int front = 0; // index of front of queue
protected int rear; // index of rear of queue
public ArrayBoundedQueue()
{
elements = (T[]) new Object[DEFCAP];
rear = DEFCAP - 1;
}
public ArrayBoundedQueue(int maxSize)
{
elements = (T[]) new Object[maxSize];
rear = maxSize - 1;
}
public void enqueue(T element)
// Throws QueueOverflowException if this queue is full;
// otherwise, adds element to the rear of this queue.
{
if (isFull())
throw new QueueOverflowException("Enqueue attempted on a full queue.");
else
{
rear = (rear + 1) % elements.length;
elements[rear] = element;
numElements = numElements + 1;
}
}
public T dequeue()
// Throws QueueUnderflowException if this queue is empty;
// otherwise, removes front element from this queue and returns it.
{
if (isEmpty())
throw new QueueUnderflowException("Dequeue attempted on empty queue.");
else
{
T toReturn = elements[front];
elements[front] = null;
front = (front + 1) % elements.length;
numElements = numElements - 1;
return toReturn;
}
}
public boolean isEmpty()
// Returns true if this queue is empty; otherwise, returns false.
{
return (numElements == 0);
}
public boolean isFull()
// Returns true if this queue is full; otherwise, returns false.
{
return (numElements == elements.length);
}
public int size()
// Returns the number of elements in this queue.
{
return numElements;
}
}
```
### Explanation
This Java program defines a generic class `ArrayBoundedQueue` that implements a queue using an array. Below is a breakdown of its components:
- **Data Fields**:](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F1b2c1e36-9974-49eb-8a0c-fe4d3c635f06%2Fc4502265-733d-4f81-ab65-1ac4fe2a1f6a%2Fhor55mg_processed.png&w=3840&q=75)
Transcribed Image Text:```java
public class ArrayBoundedQueue<T> implements QueueInterface<T>
{
protected final int DEFCAP = 100; // default capacity
protected T[] elements; // array that holds queue elements
protected int numElements = 0; // number of elements in this queue
protected int front = 0; // index of front of queue
protected int rear; // index of rear of queue
public ArrayBoundedQueue()
{
elements = (T[]) new Object[DEFCAP];
rear = DEFCAP - 1;
}
public ArrayBoundedQueue(int maxSize)
{
elements = (T[]) new Object[maxSize];
rear = maxSize - 1;
}
public void enqueue(T element)
// Throws QueueOverflowException if this queue is full;
// otherwise, adds element to the rear of this queue.
{
if (isFull())
throw new QueueOverflowException("Enqueue attempted on a full queue.");
else
{
rear = (rear + 1) % elements.length;
elements[rear] = element;
numElements = numElements + 1;
}
}
public T dequeue()
// Throws QueueUnderflowException if this queue is empty;
// otherwise, removes front element from this queue and returns it.
{
if (isEmpty())
throw new QueueUnderflowException("Dequeue attempted on empty queue.");
else
{
T toReturn = elements[front];
elements[front] = null;
front = (front + 1) % elements.length;
numElements = numElements - 1;
return toReturn;
}
}
public boolean isEmpty()
// Returns true if this queue is empty; otherwise, returns false.
{
return (numElements == 0);
}
public boolean isFull()
// Returns true if this queue is full; otherwise, returns false.
{
return (numElements == elements.length);
}
public int size()
// Returns the number of elements in this queue.
{
return numElements;
}
}
```
### Explanation
This Java program defines a generic class `ArrayBoundedQueue` that implements a queue using an array. Below is a breakdown of its components:
- **Data Fields**:
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