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网页连接收藏 |
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Java面试：MySQL面试题汇总 |
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MySQL 查询语句的内部执行过程 |
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首先，MySQL 解析查询语句，并将其分解成一个或多个子任务。 |
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然后，MySQL 将子任务交给它的优化器来优化查询计划。 |
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优化器根据数据库中的... |
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<p> |
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基本概念 |
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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。 |
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IO流的分类 |
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字节流 |
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字节流基类 |
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1）InputStream |
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InputS... |
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定义 |
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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。 |
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过程 |
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加载 |
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... |
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<a><i class="fa fa-calendar"></i></a><a>2021-02-08</a> |
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<h2 class="kratos-entry-title-new"><a href="/2021/02/07/java-annotation/">注解</a> |
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<p> |
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注解的概念 |
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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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<a><i class="fa fa-calendar"></i></a><a>2021-02-07</a> |
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<a class="tag-none-link" href="/tags/%E5%8F%82%E6%95%B0/" rel="tag">参数</a>, <a class="tag-none-link" href="/tags/%E5%91%A8%E6%9C%9F/" rel="tag">周期</a>, <a class="tag-none-link" href="/tags/%E7%B1%BB%E5%9E%8B/" rel="tag">类型</a> |
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什么叫java反射 |
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Java反射是Java被视为动态（或准动态）语言的一个关键性质。 |
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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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<a><i class="fa fa-calendar"></i></a><a>2021-02-06</a> |
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<a class="tag-none-link" href="/tags/%E5%8A%A8%E6%80%81/" rel="tag">动态</a>, <a class="tag-none-link" href="/tags/%E5%AE%9E%E4%BE%8B/" rel="tag">实例</a>, <a class="tag-none-link" href="/tags/%E6%9E%84%E9%80%A0/" rel="tag">构造</a> |
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SpringBoot之常用注解 |
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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 |
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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： |
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序号 |
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数据类型 |
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位数 |
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默认值 |
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取值范围 |
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举例说明 |
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1 |
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byte(位) |
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8 |
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0 |
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-2^7 ~ +2^7-1 |
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byte b ... |
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java面向对象的三大特征是什么?封装、继承、多态。 |
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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。 |
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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。 |
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多态多态就是同一个接口... |
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设计模式分类 |
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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。 |
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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。 |
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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 |
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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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