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java容器分析介绍 — 刘帅Java工程师

https://liuscoding.cn/2019/07/28/java-collection/

1.为什么需要容器?通过,程序总是在运行时才能确定要创建对象的数量,甚至是对象的类型。为了解决这个问题,需要在任意时刻位置创建任意数量的对象。大多数语言都提供某种方法来解决这个问题,java使用容器来解决这个问题。容器也称集合类,基本的类型是 List,Set,Queue,Map,但由于Java 类库中使用了 Collection 关键字作接口。所以一般用容器来称呼这些集合类。java容器工具的jar包是java.util.*。

MySQL一条SQL语句查询语句是怎么执行的? — 刘帅Java工程师

https://liuscoding.github.io/2019/07/26/mysql-1/

一、MySQL一条SQL语句查询语句是怎么执行的?我们经常说,看一个事儿千万不要直接陷入细节里,你应该先鸟瞰其全貌,这样能够帮助你从高维度理解问题。同样,对于MySQL的学习也是这样。平时我们使用数据库,看到的通常都是一个整体。比如,你有个最简单的表,表里只有一个ID字段,在执行下面这个查询语句时: mysql>: select * from user where id = 10;

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