zjy_lilas的博客

首先看hashcode()在Object中定义， Jdk 1.8 /** * Returns a hash code value for the object. This method is * supported for the benefit of hash tables such as those provided by * {@link java.u

1.工厂方法模式 定义：一个创建对象的接口,但由子类决定实现要实例化的类是哪一个。工厂方法让类把实例化推迟到子类。例子：披萨店里点披萨；有多个店，每个点有不同披萨。1.1店抽象类package factory;/** * Created by zjy on 2017/3/30. */public abstract class PizzaStore { public Pizza o