state paters

what is the State Pattern.

and when used it 

State Pattern

• In State pattern, a class behavior changes based on its state. This type of design pattern comes under behavior patternBullet Three.

• In State pattern, we create objects which represent various states and a context object whose behavior varies as its state object changes

Implementation

• We are going to create a State interface defining an action and concrete state classes implementing the State interface. Context is a class which carries a State.

• StatePatternDemo,  our  demo  class,  will  use  Context  and  state  objects  to demonstrate a change in Context behavior based on the type of state it is in

Example

Step 1

Create an interface.

State Pattern

State Pattern

Step 2

Create concrete classes implementing the same interface.

State Pattern

Step 4

Use the Context to see a change in behavior when State changes.

State Pattern

Step 5

Verify the output.

thank you for leasing