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<a href="/"><h2>YongKJ</h2><br><span>勇往直前，永不言弃</span></a>
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<a class="label-link" href="/categories/Java%E5%AD%A6%E4%B9%A0/">Java学习</a>
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基本概念
Java对数据的操作是通过流的方式，IO流用来处理设备之间的数据传输，上传文件和下载文件，Java用于操作流的对象都在IO包中。
IO流的分类
字节流
字节流基类
​ 1）InputStream
InputS...
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定义
当程序主动使用某个类时，如果该类还未被加载到内存中，则JVM会通过加载、连接、初始化3个步骤来对该类进行初始化。如果没有意外，JVM将会连续完成3个步骤，所以有时也把这个3个步骤统称为类加载或类初始化。
过程
加载
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注解的概念
注解（Annotation），也叫元数据（Metadata），是Java5的新特性，JDK5引入了Metadata很容易的就能够调用Annotations。注解与类、接口、枚举在同一个层次，并可以应用于包、类型、构造方法、...
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什么叫java反射
Java反射是Java被视为动态（或准动态）语言的一个关键性质。
这个机制允许程序在运行时透过Reflection APIs取得任何一个已知名称的class的内部信息，包括其modifiers（诸如public,...
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SpringBoot之常用注解
在spring boot中，摒弃了spring以往项目中大量繁琐的配置，遵循约定大于配置的原则，通过自身默认配置，极大的降低了项目搭建的复杂度。同样在spring boot中，大量注解的使用，使得代码看...
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8种基本数据类型
关于Java的8种基本数据类型，其名称、位数、默认值、取值范围及示例如下表所示：
序号
数据类型
位数
默认值
取值范围
举例说明
1
byte(位)
8
0
-2^7 ~ +2^7-1
byte b ...
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面向对象的特征
java面向对象的三大特征是什么?封装、继承、多态。
封装把属性和方法隐藏起来，只保留一些对外的接口和外部进行交互。
继承子类继承父类的特征和行为，使得子类具有父类的非private属性和方法。
多态多态就是同一个接口...
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设计模式分类
创建型模式，共五种：工厂方法模式、抽象工厂模式、单例模式、建造者模式、原型模式。
结构型模式，共七种：适配器模式、装饰器模式、代理模式、外观模式、桥接模式、组合模式、享元模式。
行为型模式，共十一种：策略模式、模板方法模...
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为什么要使用版本管理工具
备份文件：我们在日常开发中，代码备份必不可少。可以采用移动硬盘、网盘的形式来备份，但是以这种形式也有很多弊端。我们程序员一天的工作量都写在几个文件里面，如果说因为一些未知因素导致丢失了，这种情况损失还是挺大的...
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数据库事务
定义
​ 1）数据库事务是构成单一逻辑工作单元的操作集合，包含一个或多个数据库操作，这些操作构成一个逻辑上的整体。
​ 2）一个典型的数据库事务如下所示
1234BEGIN TRANSACTION ...
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