The State Pattern is a behavioral design pattern that allows an object to change its behavior when its internal state changes. Instead of using if-else or switch statements, the pattern delegates state-specific behavior to individual state classes.
- Context 🏗️: The object that changes its behavior based on its current state.
- State Interface 🔄: Defines a common interface for all states.
- Concrete States 🎭: Different implementations of the state interface.
- Eliminates Complex Conditionals ❌🔀
- Encapsulates State-Specific Behavior 🔐
- Promotes Code Maintainability 🛠️
- Traffic Light System 🚦: Changing behavior based on red, yellow, and green states.
- Media Player 🎵: Play, pause, stop states.
- Order Processing System 📦: States like pending, shipped, delivered, canceled.
- Better Code Organization 📂: Each state has its own class.
- Scalability 🚀: Easily add new states without modifying existing logic.
- Encapsulation 🔒: The state transition logic is hidden from the main object.
The State Pattern is ideal when an object’s behavior depends on its internal state. By separating state-specific behavior, it makes the code cleaner, more modular, and easier to extend. 🌟
🔗 Example Code: See Implementation