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source/_posts/ECharts地图省市联动.md

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date: 2020-03-05 20:22:00
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![](https://cdn.jsdelivr.net/gh/coder-lida/CDN/img/chart.png)
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>最近需要做一个省市联动的地图,来随时观看各地区的用户数量。
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source/_posts/Java-中-IO-流.md

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date: 2020-03-12 08:52:00
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## Java 中 IO 流分为几种?

source/_posts/Java14新特性:Switch表达式.md

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>Java 14正式发布switch表达式特性。在之前的两个 Java 版本Java12,Java13,switch特性只是预览版。
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新的switch表达式有助于避免一些bug,因为它的表达和组合方式更容易编写。

source/_posts/Java14新特性:增强-instanceOf-类型推断.md

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>Java中instanceof是用来判断对象的类型是否是目标类型。如果是返回true,不是返回false。
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source/_posts/Java14新特性:增强NPE-NullPointerException-错误推断.md

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>改进 NullPointerExceptions,通过准确描述哪些变量为 null 来提高 JVM 生成的异常的可用性。该提案的作者希望为开发人员和支持人员提供有关程序为何异常终止的有用信息,并通过更清楚地将动态异常与静态程序代码相关联来提高对程序的理解。
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source/_posts/Java14新特性:字符串块.md

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java1之前写字符串拼接
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```

source/_posts/Java下载文件的几种方式.md

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## 以流的方式下载

source/_posts/Java中的clone.md

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## Java中对象的创建
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* 使用new操作符创建一个对象

source/_posts/Java反射.md

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## 一、什么是反射?
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[JAVA反射机制](https://baike.baidu.com/item/JAVA%E5%8F%8D%E5%B0%84%E6%9C%BA%E5%88%B6/6015990)是在运行状态中,对于任意一个类,都能够知道这个类的所有属性和方法;对于任意一个对象,都能够调用它的任意方法和属性;这种动态获取信息以及动态调用对象方法的功能称为java语言的反射机制。

source/_posts/Java线程创建全家桶.md

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## 继承Thread类

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