1) There are 23 GoF patterns.
2) 42 design patterns in Software Architecture Design Patterns in Java by Partha Kuchana
- 7 Basic patterns
- 5 Creational patterns
- 4 Collectional patterns
- 11 Structural patterns
- 11 Behavioral patterns
- 4 Concurrency patterns
A design pattern is a documented best practice or core of a solution that has been applied successfully in multiple environments to solve a problem that recurs in a specific set of situations.
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