Question: Can someone write a JUnit test for my CircularArrayQueue class that implements ItemQueue. I use EclipseIDE and Java, Thank You. CircluarArrayQueue.java: import java.util.NoSuchElementException; /** *
Can someone write a JUnit test for my CircularArrayQueue class that implements ItemQueue. I use EclipseIDE and Java, Thank You.
CircluarArrayQueue.java:
import java.util.NoSuchElementException;
/**
* Circular array implementation of a queue
*
* @author
*
*/
public class CircularArrayQueue
private static final int capacity = 4;
private Object[] Q;
private int N; // capacity
private int f = 0;
private int r = 0;
public CircularArrayQueue() {
this(capacity);
}
public CircularArrayQueue(int capacity) {
N = capacity;
Q = new Object[N];
}
@Override
public void enqueueItem(E item) {
if (isFull()) {
throw new NoSuchElementException("Queue is Full.");
} else {
Q[r] = item;
r = (r + 1) % N;
}
}
@SuppressWarnings("unchecked")
@Override
public E dequeueItem() {
E item;
if (isEmpty()) {
throw new NoSuchElementException("Queue is Empty.");
} else {
item = (E) Q[f];
Q[f] = null;
f = (f + 1) % N;
}
return (E) item;
}
@SuppressWarnings("unchecked")
@Override
public E peekItem() {
if (isEmpty()) {
throw new NoSuchElementException("Queue is Empty.");
} else {
return (E) Q[r];
}
}
/**
* check for empty queue
*
*/
@Override
public boolean isEmpty() {
return (r == f) ? true : false;
}
/**
* check for full queue
*
*/
public boolean isFull() {
int diff = r - f;
if (diff == -1 || diff == (N - 1))
return true;
return false;
}
/**
* check number of items in the queue
*
*/
@Override
public int noItems() {
if (r > f)
return r - f;
return N - f + r;
}
}
ItemQueue.java:
/**
* An abstract data type for a Queue. Specifies the 5
* main methods of a queue
*
* @author
*/
public interface ItemQueue
/**
* Enqueue an object to the end of the queue
* @param item the object to be enqueued
*/
public void enqueueItem(E item);
/**
* Dequeue an object from the front of the queue
* @return the item removed from the front of the queue
* @throws NoSuchElementException if the queue is empty
*/
public E dequeueItem();
/**
* Examine the object at the head of the queue, but do
* not remove it.
* @return the item at the head of the queue
* @throws NoSuchElementException if the queue is empty
*/
public E peekItem();
/**
* Test if the queue is empty
* @return true if the queue is empty, otherwise false
*/
public boolean isEmpty();
/**
* Get the number of items in the queue
*
* @return the number of items in the queue
*/
public int noItems();
}
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