Phase 1 Language Basics + Advanced _1-3-Java language senior _02- inheritance and polymorphism _ Section 7 of the inner class _19_ red envelopes red envelopes average ordinary case _

Open red envelope

OpenModel is an interface which is only an abstract method. divide is struggling mean.

Creating a common mode of class

implementation pattern classes, methods, distributed inside rewritten. This distribution mode is a usual


left is the interface, the right is the implementation class, red normal mode.

The total amount and the number of red envelopes is impossible to change it together with its final modification.


It runs directly here.





Point to open




such an ordinary red envelope is realized.