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Let's begin to learn what's Chain of Responsibility Pattern.

Let's begin to learn what's Observer Pattern.

Let's begin to learn what's strategy Pattern.

Let's begin to learn what's Decorator Pattern.

Let's begin to learn what's Builder Pattern.

Let's begin to learn what's Abstract Factory Pattern.

Let's begin to learn what's Factory Pattern.

Let's begin to learn what's Proxy Pattern.

Let's begin to learn what's design pattern.

What's compile-time and runtime constants in Java?