State Pattern Standard Implementation added

[ighosh98]

Fixes issue:

#5924 is fixed in Java

Changes:

State Pattern implemented in Java. In this commit I have implemented two states: Start State and Stop State. This model can be extended to a multi-state solution

[Devansh-Maurya]

The implementation does not live up to the definition of the state pattern. Your State interface has a function named goNext() but it is not changing the state of the context. The Client should not need to change the state of the Context by itself. If you are doing this, you are losing the power of the state pattern. You should delegate the responsibility to change states to the States themselves.

Also, the Context should not implement the State interface as it is not a State. It is the object that has State.

Please refer to this resource (or any other resource that you found helpful) for more information on the State pattern: https://sourcemaking.com/design_patterns/state

[Devansh-Maurya]

1. Please keep classes in separate files.
2. Group similar classes in the same package.
3. Structure packages according to the UML diagram of the pattern.

[ighosh98]

Thanks. I'll work on it.