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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

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

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.