java - 如何很好的对代码进行重构？

Question

在写代码实现业务场景的过程中，要不断对代码进行重构，有什么原则啊？还有，在核心代码处要加日志，一般要怎么组织关键字，对于有性能损耗的地方，需要不需要刚开始就日志记录执行时间呢？日志打太多会影响程序的性能的，所以日志也应该不要太多为好的吧。

Answer 1

Looking at some design patterns will help

Answer 2

There is a good book about refactoring, step by step,

Answer 3

The principle is: Refactoring should be considered only when development efficiency or operating efficiency encounters a bottleneck

Answer 4

1. Please learn the setting mode for reconstruction issues

2. For log issues, it is generally recommended to log in key places. As for too many logs affecting performance, a very simple way is to set a switch:

if (ENABLE_LOG){
    log(TAG, something);
}

ENABLE_LOG is set to true in the development version and to false in the release version, so that the log can be used without affecting performance in the official version.