OOAD Reading Notes (III): demand changes

The only truth that remains unchanged in software development is:Change

User demand changes are common for us.ProgramWe cannot complain, strive for flexibility, reuse is the right way.

Demand changes often bring new problems to the system. If we do not analyze and think deeply, we may not find these problems.

Some design principles can be used to reduce program changes:

Encapsulation: Separate changes from unchanged things and do not mix them together. In this way, when demand changes, you only need to changeCodeTo reduce some problems.