Queue.java

package com.github.fei9009.coding2017.basic;

public class Queue {
	private ArrayList elementData = new ArrayList();
	
	public void enQueue(Object o){		
		elementData.add(o);
	}
	
	public Object deQueue(){
		return elementData.remove(0);
	}
	
	public boolean isEmpty(){
		return elementData.size() == 0 ? true : false;
	}
	
	public int size(){
		return elementData.size();
	}
}