package com.coding.basic;
public class Queue {
private List list = new ArrayList();
private int size = 0;
public void enQueue(Object o){
list.add(o);
size ++;
}
public Object deQueue(){
if (size == 0)
return null;
size --;
return list.remove(0);
}
public boolean isEmpty(){
return size == 0;
}
public int size(){
return size;
}
}