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package com.types;

import java.util.NoSuchElementException;

/**

* Interface to provide queue specific functionality to the implementing class

* This interface only defines the functionality which the queue implementing classes require.

* Any class having queue behaviour should implement this interface and override all of its methods

*

* @param <T>

*/

public interface Queue<T> extends DataStructure<T> {

/**

* Method to add element

*

* @param t element

* @return boolean

* @throws NullPointerException

*/

boolean offer(T t) throws NullPointerException;

/**

* Method to remove element

*

* @return element

*/

T poll();

/**

* Method to check element on head

*

* @return element

*/

T peek();

/**

* Method to check element on head. This throws exception on runtime if the queue is empty

*

* @return element

* @throws NoSuchElementException

*/

T element() throws NoSuchElementException;

}