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超简单java基础练习代码

有的时候越简单的东西，可能越不在意

恰恰是一些细节，基础，造成的影响会更加的深远

1. cite包：java中的值传递（针对引用数据和基本数据）

2. duplicate包：利用set的特性快速给list集合去重

3. equals包：包装类型和基础数据类型的 == 以及equals比较；重写euqals方法一定要重写hashCode方法

4. hashmap包：java 中 && 优先级高于 ||，以及hashmap可以存null吗？

5. list包：略

6. polymorphism包：java中的多态练习

7. staticorder包：java中对象的生成顺序

8. string包：java中的String类型（常量池，intern方法入池，以及+符号的两种形式）

9. Thread包：Lock锁完成多线程操作；使用lock锁的condition对象完成线程通信（虚假唤醒）

10. 关于自己整理的一份java知识笔记，后续也会上传（java博大精深，死记硬背永远没有出路，试着去理解，然后用自己的话语陈述出来，不完美，但是总归在学习，在进步，在一点点变好）

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