The Simple Factory、The Factory Method 、The Abstract Factory

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The Singleton Pattern ensure a class has only one instance, and provides a global point of access to it.

The Adapter Pattern converts the interface of a class into another interface the clients expect. Adapter lets classes work together that couldn't otherwise because of incompatible interfaces.

The State Pattern allows an object to alter its behavior when its internal state changes. The object will appear to change its class.

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public class Vector extends AbstractList implements List

The Facade Pattern provides a unified interface to a set of interfaces in subsystem. Facade defines a higher-level interface that makes the subsystem easier to use.

The Decorator Pattern attaches additional responsibilities to an object dynamically. Decorators provide a flexible alternative to subclassing for extending functionality.

The Template Method Pattern defines the skeleton of an algorithm in a method, deferring some steps to subclasses. Template Method lets subclass redefine certain steps of an algorithm without changing the algorithm's structure.

The Observer Pattern defines as one-to-many dependcy between objects so that when one object changes state, all if its depends are notified and updated automatically.

public interface List extends Collection