As an experienced Java programmer, you should be familiar with various design patterns that can help you write clean, maintainable, and reusable code. Here are 23 design patterns that are commonly used in Java development:
Singleton Pattern: Ensures that a class has only one instance and provides a global point of access to it.
Factory Method Pattern: Defines an interface for creating objects but lets subclasses decide which class to instantiate.
Abstract Factory Pattern: Provides an interface for creating families of related or dependent objects without specifying their concrete classes.
Builder Pattern: Separates the construction of a complex object from its representation, allowing the same construction process to create various representations.
Prototype Pattern: Creates new objects by cloning an existing object, avoiding the need for expensive object creation operations.
Adapter Pattern: Converts the interface of a class into another interface that clients expect, enabling classes with incompatible interfaces to work together.
Bridge Pattern: Decouples an abstraction from its implementation, allowing them to vary independently.
Composite Pattern: Composes objects into tree structures to represent part-whole hierarchies. It lets clients treat individual objects and compositions of objects uniformly.
Decorator Pattern: Dynamically adds responsibilities to objects by wrapping them in an object of a decorator class, providing a flexible alternative to subclassing.
Facade Pattern: Provides a unified interface to a set of interfaces in a subsystem, simplifying and decoupling the client code from complex subsystems.
Flyweight Pattern: Shares a large number of fine-grained objects efficiently to minimize memory usage, particularly useful when creating a large number of similar objects.
Proxy Pattern: Provides a surrogate or placeholder object, controlling access to another object and adding extra functionality before or after accessing the original object.
Chain of Responsibility Pattern: Allows an object to pass a request along a chain of potential handlers until one of them handles the request.
Command Pattern: Encapsulates a request as an object, allowing you to parameterize clients with different requests, queue or log requests, and support undoable operations.
Interpreter Pattern: Defines a grammatical representation for a language and provides an interpreter to evaluate sentences in the language.
Iterator Pattern: Provides a way to access elements of an aggregate object sequentially without exposing its underlying representation.
Mediator Pattern: Defines an object that encapsulates how a set of objects interact, promoting loose coupling by keeping objects from referring to each other explicitly.
Memento Pattern: Captures and restores an object's internal state, allowing you to return an object to its previous state.
Observer Pattern: Defines a one-to-many dependency between objects, ensuring that when one object changes its state, all its dependents are notified and updated automatically.
State Pattern: Allows an object to alter its behavior when its internal state changes, encapsulating state-specific logic into separate classes.
Strategy Pattern: Defines a family of algorithms, encapsulates each one, and makes them interchangeable, allowing the algorithm to vary independently from clients using it.
Template Method Pattern: Defines the skeleton of an algorithm in a method, allowing subclasses to redefine certain steps of the algorithm without changing its structure.
Visitor Pattern: Separates an algorithm from the objects on which it operates, allowing new operations to be added without modifying the objects' classes.
These design patterns are widely used in Java development and provide solutions to recurring design problems. Understanding these patterns and knowing when to apply them can greatly improve your software design skills and help you write more efficient and maintainable code.
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