Many. A site says at least 250 existing patterns are used in OO world, including Spaghetti which refers to poor coding habits. The 23 design patterns by GOF are well known, and more are to be discovered on the way.Note that the design patterns are not idioms or algorithms or components.
Java
Topic: Design pattern
How many design patterns?
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What is the design pattern?
Do I have to use the design pattern?
How many design patterns?
What is the relationship among these patterns?
What is a software design pattern?
What is an analysis pattern?
What are the differences between analysis patterns and design patterns?
What is Singleton pattern?
Explain the Observer pattern?
Explain the Strategy and Template patterns?
Explain the Single Thread Execution pattern in concurrency patterns?
What are the structural patterns ?
Explain the Adapter pattern?
Expain the Proxy and Decorator patterns?
Explain the Composite pattern?
What are Behavioral patterns?
Explain the Observer pattern?
Explain the strategy and template patterns
Explain the concurrency patterns?
Explain the Single thread execution pattern?
Explain Design Patterns template?
Explain Patterns in Java template?
