Pattern types in java

Pattern types in java

Advantage of design pattern:

  1. They are reusable in multiple projects.
  2. They provide the solutions that help to define the system architecture.
  3. They capture the software engineering experiences.
  4. They provide transparency to the design of an application.
  5. They are well-proved and testified solutions since they have been built upon the knowledge and experience of expert software developers.
  6. Design patterns don?t guarantee an absolute solution to a problem. They provide clarity to the system architecture and the possibility of building a better system.

When should we use the design patterns?

We must use the design patterns during the analysis and requirement phase of SDLC(Software Development Life Cycle).

Design patterns ease the analysis and requirement phase of SDLC by providing information based on prior hands-on experiences.

Categorization of design patterns:

Basically, design patterns are categorized into two parts:

Core Java Design Patterns

In core java, there are mainly three types of design patterns, which are further divided into their sub-parts:

1.Creational Design Pattern

  1. Factory Pattern
  2. Abstract Factory Pattern
  3. Singleton Pattern
  4. Prototype Pattern
  5. Builder Pattern.

2. Structural Design Pattern

  1. Adapter Pattern
  2. Bridge Pattern
  3. Composite Pattern
  4. Decorator Pattern
  5. Facade Pattern
  6. Flyweight Pattern
  7. Proxy Pattern
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3. Behavioral Design Pattern

  1. Chain Of Responsibility Pattern
  2. Command Pattern
  3. Interpreter Pattern
  4. Iterator Pattern
  5. Mediator Pattern
  6. Memento Pattern
  7. Observer Pattern
  8. State Pattern
  9. Strategy Pattern
  10. Template Pattern
  11. Visitor Pattern

Design Patterns Index

Design Patterns Tutorial

1) Creational Pattern

2) Structural Pattern

3) Behavioral Pattern

  • 3) Behavioral Pattern
  • Chain of Responsibility
  • Command Pattern
  • Interpreter Pattern
  • Iterator Pattern
  • Mediator Pattern
  • Memento Pattern
  • Observer Pattern
  • State Pattern
  • Strategy Pattern
  • Template Pattern

Do you know?

  • Christopher Alexander was the first person who invented all the above Design Patterns in 1977.
  • But later the Gang of Four — Design patterns, elements of reusable object-oriented software book was written by a group of four persons named as Erich Gamma, Richard Helm, Ralph Johnson and John Vlissides in 1995.
  • That’s why all the above 23 Design Patterns are known as Gang of Four (GoF) Design Patterns.

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