Since he has authored a book on patterns, I must be wrong. In Strategy pattern, a class behavior or its algorithm can be changed at run time. If we have to change behavior of an object based on its state, we can have a state variable in the Object and use if-else condition block to perform different actions based on the state. With strategy design, Java programmer … Strategy design pattern in Java Strategy design pattern is different from state design pattern in Java. The state pattern is a behavioral software design pattern that allows an object to alter its behavior when its internal state changes. The strategy pattern provides a better alternative to subclassing, while in state pattern – behavior is encapsulated in separate classes. In this pattern, an object is created which represent various states and a context object whose behavior varies as it's state object changes. In fact, Strategy pattern is nothing but a clever way of achieving functional programming in Java, even before Java 8. This type of design pattern comes under behavior pattern. State Pattern. However, one big difference is the following: Strategy Pattern is used when the whole algorithm is changed to another algorithm and the client is responsible for that, whereas, in State Pattern, the class itself manages the strategy based on the state. State Game Programming Patterns Design Patterns Revisited. State vs. Strategy Pattern You can find an example on our Singleton pattern page. State pattern vs strategy pattern. If we have to change behavior of an object based on its state, we can have a state variable in the Object and use if-else condition block to perform different actions based on the state. That makes the state hardcoded, which is a bad practice in general. Strategy works on the object level, letting you switch behaviors at runtime. State Design Pattern is used to alter the behavior of an object when it’s internal state changes. State pattern is useful when we want to maintain various states for a scenario in our program. However, one big difference is the following: Strategy Pattern is used when the whole algorithm is changed to another algorithm and the client is responsible for that, whereas, in State Pattern, the class itself manages the strategy based on the state. The strategy design encapsulates a various set of algorithms for runtime execution. 5.1. State pattern is one of the behavioral design pattern.State design pattern is used when an Object changes its behavior based on its internal state. After reading the words above, I hope you have a good understanding of the differences between strategy pattern and state pattern. This pattern seems like a dynamic version of the Strategy pattern. Since he has authored a book on patterns, I must be wrong. This pattern is close to the concept of finite-state machines.The state pattern can be interpreted as a strategy pattern, which is able to switch a strategy through invocations of methods defined in the pattern's interface. This type of design pattern comes under behavior pattern. State pattern is always stateful but Strategy will not. State pattern drawback is the payoff when implementing transition between the states. If you want to read in-depth tutorials on the patterns themselves then you can read them here – State Pattern tutorial Read State Design Pattern Tutorial and Strategy Pattern tutorial Read Strategy Design Pattern Tutorial. In Strategy pattern, we create objects which represent various strategies and a context object whose behavior varies as per its strategy object. 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