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15 questions about the soul of Java Development Manual (Songshan version)

What I want to share with you today is about 《Java Development Manual ( Song Mountain version )》 soul 15 ask , Pull down at the end of the text to get the link to the network disk

1. Why not use Apache Beanutils For properties copy ? file

file

2. Why the date format must use y Indicate year , But can't use Y ? file

file

3.《Java Development Manual - Taishan Edition 》 What is the problem of null pointer of ternary operators mentioned ? file

file

4. Why is initialization recommended HashMap Capacity size of ? file

file

5.Java The development manual suggests creating HashMap Set the initialization capacity , But how much is appropriate ? file

file

6. Why not use Executors Creating a thread pool ? file

7. Why use with caution ArrayList Medium subList Method ? file

8. Why not suggest for Use in loop “+” String splicing ? file

9. Why forbid in foreach It's going on in the cycle remove/add operation ? file

10. Why prohibit engineers from using log systems directly (Log4j、Logback) Medium API ? file

11. Why is it forbidden SimpleDateFormat Defined as static Variable ? file

12. Why is it forbidden for developers to use isSuccess As a variable name ? file

13. Why is it forbidden for developers to modify serialVersionUID Value of field ? file

file

14. Why should developers be advised to use inheritance carefully ? file

15. Why not use count( Name ) or count( Constant ) To replace count(*) ? file

file

Click on the link to get the full document link :https://pan.baidu.com/s/1mtUe-MPNCCe4QVw-ubhSUg Extraction code :e91t

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