Java design patterns

Category : Java | Sub Category : Java Interview questions | By Prasad Bonam Last updated: 2023-07-08 15:23:31 Viewed : 485


Java design patterns :

Java design patterns are reusable solutions to common software design problems. They provide proven approaches for designing and structuring code that enhances maintainability, flexibility, and scalability. Here are some commonly used design patterns in Java:

  1. Singleton Pattern: Ensures that a class has only one instance and provides a global point of access to it.


  2. Factory Pattern: Provides an interface for creating objects, but allows subclasses to decide which class to instantiate.


  3. Builder Pattern: Separates the construction of complex objects from their representation, allowing the same construction process to create different representations.


  4. Observer Pattern: Defines a one-to-many dependency between objects, so that when one object changes state, all its dependents are notified and updated automatically.


  5. Decorator Pattern: Allows adding new behavior to an object dynamically by wrapping it with a decorator class, without modifying the original objects structure.


  6. Adapter Pattern: Converts the interface of a class into another interface that clients expect, enabling classes with incompatible interfaces to work together.


  7. Iterator Pattern: Provides a way to access elements of an aggregate object sequentially without exposing its underlying representation.


  8. Strategy Pattern: Defines a family of interchangeable algorithms and encapsulates each one, allowing them to be used interchangeably based on client requirements.


  9. Template Method Pattern: Defines the skeleton of an algorithm in a superclass, allowing subclasses to override certain steps of the algorithm while keeping the overall structure intact.


  10. Proxy Pattern: Provides a surrogate or placeholder for another object to control its access, add extra functionality, or defer expensive operations.

These are just a few examples of design patterns, and there are many more patterns available to address different design challenges. Each pattern has its purpose and can be applied to specific situations in software development.

It is important to note that design patterns are not strict rules but rather guidelines that can be adapted and modified to fit the requirements of a particular project. The choice of design pattern depends on the problem at hand, the context, and the desired software qualities.


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