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Queue.java
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45 lines (38 loc) · 1 KB
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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;
}