Java编程里一般怎么管理接口的实现类？

Question

比如说Color接口有三个实现类分别是：Red、Blue和Green
现在我要在运行的时候才决定用某个实现类
怎么管理比较优雅？别if..else..

Answer 1

工厂方法模式

Answer 2

In programming, 顺序、分支、循环三种结构。if-else is the most commonly used branch structure and is indispensable.

Regarding this issue, if-else is the simplest programming method for anyone who has learned programming. And the simplest is the most elegant.

And what if-else有时候看起来比较糟糕的地方在于，if中嵌套很多层if-else sometimes looks bad is that there are many layers nested in if

, resulting in excessive depth of logical judgment.

if的的时候就提前返回结果，保证ifSo a good solution is to limit the maximum depth of early exit

to two levels.

Here is a similar question you can look at:

There are many if-else, how to optimize it?

简单的设计与设计模式Design patterns can bring you convenience, but don’t force design patterns into your own solutions. You need to make compromises between

for your own code. 🎜

Answer 3

The title description feels more in line with the design pattern 策略模式.

Answer 4

Why not use polymorphism and leave it to implicit type conversion? It is handled according to the implementation of the interface method.