For Exam (Java Common design mode) Introduction

A Create-mode

Factory mode (Factory): Defines an interface for creating objects

Abstract Factory: Provides an interface to create a series of related or interdependent objects

Singleton mode (Singleton): guarantees that a class has only one instance and provides a global control point to access it.

Builder mode: Separates the construction of a complex object from its representation.

Two-structure mode

Adapter mode (Adapter): Transforms the interface of one class into another interface that the customer wants.

Compositing mode (Composite): Composition mode combines objects into a tree structure to represent a "partial---overall" hierarchy.

Decorator Mode Decorator: Dynamically add some extra responsibilities to an object

Proxy mode proxies: Provides a proxy for other objects to control access to this object

Appearance mode (facade): Provides a consistent interface for a set of interfaces in a subsystem.

Bridge mode: Bridge mode separates the abstract part from its implementation part

Tri-Behavioral Mode

Mediator Mode (mediator): The mediator pattern encapsulates a series of object interactions with a mediation object.

Policy mode strategy: The policy pattern defines a series of algorithms, encapsulates them one by one, and enables them to replace each other.

Template mode: Defines an algorithm skeleton in an operation, and delays some steps into subclasses.

Observer Mode (OBSERVER): Defines a one-to-many dependency that allows multiple observer objects to listen to a Subject object at the same time

Iterator mode (Iterator): Iterator mode provides a way to sequentially access individual elements in an aggregated object

Responsibility chain mode (Chain of Responsibility): The chain of responsibility mode enables multiple objects to have the opportunity to process requests, thus avoiding the coupling between the sender and receiver of the request

Command mode: Encapsulates a request into an object so that the customer can be parameterized with different requests.

State mode: state mode allows an object to change its behavior when its internal state changes.

Visitor Mode (Visitor): The visitor pattern represents an action that acts on elements in an object's structure.

For Exam (Java Common design mode) Introduction