Question
public class CircularQueue
{
protected static final int CAPACITY = 100;
protected int size,front,rear;
protected Object q[];
int count = 0;
public CircularQueue()
{
this(CAPACITY);
}
public CircularQueue (int n)
{
size = n;
front = 0;
rear = 0;
q = new Object[size];
}
public void enqueue(Object item)
{
if(count == size)
{
System.out.println("Queue overflow");
return;
}
else
{
q[rear] = item;
rear = (rear+1)%size;
count++;
}
}
public Object dequeue()
{
if(count == 0)
{
System.out.println("Queue underflow");
return 0;
}
else
{
Object ele = q[front];
q[front] = null;
front = (front+1)%size;
count--;
return ele;
}
}
public Object frontElement()
{
if(count == 0)
return -999;
else
{
Object high;
high = q[front];
return high;
}
}
public Object rearElement()
{
if(count == 0)
return -999;
else
{
Object low;
rear = (rear-1)%size;
low = q[rear];
rear = (rear+1)%size;
return low;
}
}
}
public class CircularQueueDemo
{
public static void main(String args[])
{
Object var;
CircularQueue myQ = new CircularQueue();
myQ.enqueue(10);
myQ.enqueue(3);
var = myQ.rearElement();
myQ.dequeue();
myQ.enqueue(6);
var = mQ.frontElement();
System.out.println(var+" "+var);
}
}
a.
3 3
b.
3 6
c.
6 6
d.
10 6
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