The bridging mode of design pattern I know

bridging mode design pattern know


What we're going to talk about next is Java One of the best design patterns : Bridging mode

Let's start with one question , Introducing bridge mode

Now we can implement operation programming for different brands of different types of mobile phones

such as : Turn it on 、 To turn it off 、 surf the internet , Call, etc

According to the traditional model , Let's start with different types of mobile phones , There are others under each type


Class diagram corresponding to traditional methods , Let's see , How about


Traditional solutions to mobile phone operation problems

Scalability issues ( Class blast ), If we Add more mobile phone styles ( Rotary ), We need to add all kinds of mobile phones

Also if we add a mobile phone brand , Also need to add... Under each mobile phone style category .

Violates the single responsibility principle , When we add cell phone styles , Add all brands of mobile phones at the same time , This increases the cost of code maintenance .

Solution - Use bridge mode


One 、 What is bridging mode

Bridging mode (Bridge Pattern ) Refer to : Put implementation and abstraction in two different class levels , So that the two levels can be changed independently .

Bridging mode It's a structural design pattern

Bridge Pattern Class based minimum design principles , By using encapsulation 、 Behaviors such as aggregation and inheritance let different classes take on different responsibilities .

Its main feature is Abstract (Abstraction) And behavior realization (Implementation) Separate from , So that we can maintain the independence of each part and cope with their function expansion

Analysis of principle class diagram of bridge mode


Client class : The caller of the bridge mode

abstract class (Abstraction) : Maintained Implementor / That is, its implementation class ConcreteImplementorA.

The two are converging ,Abstraction Act as a bridge class

RefinedAbstraction : yes Abstraction A subclass of an abstract class

Implementor : Behavior implementation class interface

ConcreteImplementorA /B : Concrete implementation class of behavior

from UML chart : The abstract classes and interfaces here are aggregate relationships , In fact, the relationship between calling and being called

Two 、 Bridge mode solves mobile phone operation problems

Use bridge mode to improve the traditional way , Let the program have good expansibility , Use the program to maintain

Use the class diagram corresponding to the bridge pattern


According to our thinking , Create the interface of the brand first

// Interface
interface Brand {
void open();// Turn it on
void close();// To turn it off
void call();// Make a phone call

If we have Xiaomi brand at this time , Just inherit the implementation

class Vivo implements Brand {
public void open() {
System.out.println(" Vivo Turn on the phone ");
public void close() {
System.out.println(" Vivo Mobile phone shutdown ");
public void call() {
System.out.println(" Vivo Cell phone calls ");

Next, we create an abstract class of mobile phones , Combination brands

abstract class Phone {
// Combination brands
private Brand brand;
// Constructors
public Phone(Brand brand) {
this.brand = brand;
protected void open() {;
protected void close() {
protected void call() {;

At the same time, we create a mobile phone style class , And implement mobile abstract class

class UpRightPhone extends Phone {
// Constructors
public UpRightPhone(Brand brand) {
public void open() {;
System.out.println(" Upright cell phone ");
public void close() {
System.out.println(" Upright cell phone ");
public void call() {;
System.out.println(" Upright cell phone ");

Did you find , Self supporting mobile phone open, Is calling the parent class open, And the parent class calls the interface

We use demo To experience the different brands and styles of mobile phones under the bridge mode

public static void main(String[] args) {
// Get a foldable phone ( style + brand )
Phone phone1 = new UpRightPhone(new Vivo());;;
The operation results are as follows :
Vivo Turn on the phone
Upright cell phone
Vivo Cell phone calls
Upright cell phone
Vivo Mobile phone shutdown
Upright cell phone 

Silicon Valley : Design patterns ( Mr. Han Shunping ): Bridging mode

Refactoring.Guru:《 Deep into design patterns 》

本文为[twenty-eight thousand six hundred and forty]所创,转载请带上原文链接,感谢

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