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观察者模式观察者模式（Observe Pattern）的正经定义：定义对象之间的一对多依赖关系，使得每当一个对象状态发生改变时，其相关依赖对象皆得到通知并被自动更新。

Java访问权限static在《Java编程思想》P86页有这样一段话：　　“static方法就是没有this的方法。在static方法内部不能调用非静态方法，反过来是可以的。而且可以在没有创建任何对象的前提下，仅仅通过类本身来调用static方法。这实际上正是static方法的主要用途。”这段话虽然只是说明了static方法的特殊之处，但是可以看出static关键字的基本作用，简而言之，一句话来描述就是：方便在没有创建对象的情况下来进行调用（方法/变量）。很显然，被static关键字修饰的方法

1. The IoC Container1.1. Introduction to the Spring IoC Container and BeansIoC is also known as dependency injection (DI). It is a process whereby objects define their dependencies (that is, the other objects they work with) only through constructor argu

The Spring Framework provides a comprehensive programming and configuration model for modern Java-based enterprise applications - on any kind of deployment platform.Spring Framework为现代基于Java的企业应用程序提供了一个全面的编程和配置模型——在任何类型的部署平台上。...

From configuration to security, web apps to big data—whatever the infrastructure needs of your application may be, there is a Spring Project to help you build it. Start small and use just what you need—Spring is modular by design.从配置到安全，从web应用到大数据——无论你的应用

Spring Framework: the foundation for all Spring projects.

基本语法Java 泛型了解么？什么是类型擦除？介绍一下常用的通配符？泛型的本质是参数化类型，也就是说所操作的数据类型被指定为一个参数。Java 的泛型是伪泛型，这是因为 Java 在编译期间，所有的泛型信息都会被擦掉，这也就是通常所说类型擦除 。List<Integer> list = new ArrayList<>();list.add(12);//这里直接添加会报错list.add("a");Class<? extends List> clazz =

Java® Development Kit Version 16 Tool Specifications

Introduction 引言The JDK is a development environment for building applications and components using the Java programming language.JDK 是使用 Java 编程语言构建应用程序和组件的开发环境。The JDK includes tools useful for developing, testing, and monitoring programs written in th