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class Queue
{
private int arr[];
private int front;
private int rear;
private int capacity;
private int count;
Queue(int size)
{
arr = new int[size];
capacity = size;
front = 0;
rear = -1;
count = 0;
}
public void dequeue()
{
if (isEmpty())
{
System.out.println("UnderFlownProgram Terminated");
System.exit(1);
}
System.out.println("Removing " + arr[front]);
front = (front + 1) % capacity;
count--;
}
public void enqueue(int item)
{
if (isFull())
{
System.out.println("OverFlownProgram Terminated");
System.exit(1);
}
System.out.println("Inserting " + item);
rear = (rear + 1) % capacity;
arr[rear] = item;
count++;
}
public int peek()
{
if (isEmpty())
{
System.out.println("UnderFlownProgram Terminated");
System.exit(1);
}
return arr[front];
}
public int size()
{
return count;
}
public Boolean isEmpty()
{
return (size() == 0);
}
public Boolean isFull()
{
return (size() == capacity);
}
public static void main (String[] args)
{
Queue q = new Queue(5);
q.enqueue(1);
q.enqueue(2);
q.enqueue(3);
System.out.println("Front element is: " + q.peek());
q.dequeue();
System.out.println("Front element is: " + q.peek());
System.out.println("Queue size is " + q.size());
q.dequeue();
q.dequeue();
if (q.isEmpty())
System.out.println("Queue Is Empty");
else
System.out.println("Queue Is Not Empty");
}
}
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