QUEUE OPERATION

queue operation in java

### queue operation in java



/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
public class Queue
{
	LinkedList queue;
	public Queue(){
		queue=new LinkedList();
	}
	
	public boolean isEmpty(){
		return queue.isEmpty();
	}
	
		public int size(){
		return (int) queue.size();
	}
	
	public int enqueue(int k){
		   queue.add(k);
		   return k;
		// else
		//  System.out.println("Stack overFlow");
	}
	
	public int  dequeue(){
		if((int)queue.size()==0)
		  return 0;
		 else
	      return (int)queue.remove(0);
	   }
	
	public int top(){
		return (int)queue.get(0);
	} 

	  
	public static void main (String[] args) throws java.lang.Exception
	{
		Queue numberQueue = new Queue();
        System.out.println("Size of Queue:"+numberQueue.size());
        System.out.println("Queue is empty or not: "+numberQueue.isEmpty());
        System.out.println("pushed element is :"+numberQueue.enqueue(5));
        //numberStack.push(5);
        System.out.println("Size of Queue:"+numberQueue.size());
        System.out.println("top of Queue:"+numberQueue.top());
        //numberStack.push(8);
        System.out.println("Queue is empty or not: "+numberQueue.isEmpty());
        System.out.println("pushed element is :"+numberQueue.enqueue(8));
        System.out.println("top of Queue:"+numberQueue.top());
        System.out.println("Size of Queue:"+numberQueue.size());
        System.out.println("dequeue operation performed: "+numberQueue.dequeue());
        System.out.println("dequeue operation performed: "+numberQueue.dequeue());
        System.out.println("dequeue operation performed: "+numberQueue.dequeue());
        System.out.println("Queue is empty or not: "+numberQueue.isEmpty());
	}
}