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1. Commits on Apr 9, 2020

   • 测试ReplaceFirst对空格的替换效果

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   • 类型转换

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2. Commits on Mar 30, 2020

   • 类型转换会遇到的坑

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3. Commits on Mar 27, 2020

   • Optional中flatMap和map的运用。

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4. Commits on Mar 14, 2020

   • StringUtils的运用

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   • java8使用双冒号判空，Objects::nonNull

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5. Commits on Mar 7, 2020

   • java8的Optional

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6. Commits on Mar 4, 2020

   • 重构模块

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7. Commits on Feb 14, 2020

   • 正则表达式示例

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8. Commits on Feb 1, 2020

   • 通过StringBuilder交换字符内容

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9. Commits on Jan 13, 2020

   • 重构模块

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   • 使用枚举和反射、策略模式，去掉过多的if else

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10. Commits on Jan 12, 2020

    • 使用枚举替代大量的if else

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11. Commits on Dec 10, 2019

    • 常见格式转换及单测

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12. Commits on Jul 4, 2019

    • 深克隆工具类

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13. Commits on May 16, 2019

    • Lambda表达式

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14. Commits on Mar 6, 2019

    • Lambda表达式

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    • 类的加载顺序、初始化顺序。

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15. Commits on Dec 28, 2018

    • 比较Integer和int

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16. Commits on Dec 11, 2018

    • 完善程序。

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    • 形参和实参的区别

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17. Commits on Dec 4, 2018

    • 遍历字符串。要先将字符串转化为charArray

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18. Commits on Dec 3, 2018

    • 左移运算和右移运算

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    • 规范jUnit的目录

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19. Commits on Oct 19, 2018

    • compareTo比较字符串的结果

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20. Commits on Oct 18, 2018

    • TCP和UDP网络编程

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    • 在Selector上注册多个Channel，遍历SelectionKey

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21. Commits on Oct 16, 2018

    • NIO的选择器Selector

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22. Commits on Oct 12, 2018

    • NIO的FileChannel读写文件

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23. Commits on Oct 11, 2018

    • 修改java反射例子

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24. Commits on Aug 27, 2018

    • FutureTask可以通过get()方法获取返回值。构造函数参数可以用Runnable接口，也可以用Callable接口。

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25. Commits on Aug 23, 2018

    • Future获取Executor执行任务的结果。还有通过实现Callable接口来新建线程。

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26. Commits on Aug 9, 2018

    • 用同步锁模拟CAS算法。

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    • 完善Readme.md

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    • AtomicInteger进行原子操作，保证线程安全。AtomicInteger核心是CAS无锁算法,主要原理是当一个线程去修改这个值的时候，会进入一个while循环，并且不断的尝试compareAndSet()方法， 也就是不断地比较内存值和期望值，如果相等就修改，不相等就返回false，当值修改完毕结束循环。

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