Java21Study

• This project is based on Sams Teach Yourself Java in 21 Days (Covering Java 8 and Android). It contains many examples and exercises from the book which are coded and processed by me.
• 这个项目是基于21天学通java第7版这本书的，包含了其中的例子和练习，当然还有个人的理解总结和注释，相信对于Java基础学习和回顾有一定的帮助。