Queue.java

package com.coding.basic;

public class Queue {
    private ArrayList elementData = new ArrayList();

    public void enQueue(Object o) {
        elementData.add(o);
    }

    public Object deQueue() {
        return elementData.get(0);
    }

    public boolean isEmpty() {
        return elementData.size() == 0 ? true : false;
    }

    public int size() {
        return elementData.size();
    }
}