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This article introduces the relevant knowledge of "how to implement the java strategy model". In the operation of actual cases, many people will encounter such a dilemma. Next, let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Liu Bei is going to Jiangdong to marry a wife. before leaving, Zhuge Liang gave Zhao Yun (best man) three tricks up his sleeve, saying that he took it apart to solve thorny problems.

Hey, not to mention, it really solved the big problem. In the end, it was Zhou Yu who accompanied her husband and reduced his troops. Let's first see what this scene looks like.

First of all, let's talk about the elements of this scene: three clever tricks, one kit and one Zhao Yun, which was given by Comrade Xiaoliang. The trick is put in the bag, which is commonly known as a trick out of the bag. Zhao Yun is a worker who takes the trick out of the bag, executes it, and then wins. How to show this with the JAVA program? Let's first look at the class diagram:

The three tricks are of the same type, so let's write an interface: package com.cbf4life.strategy;* first defines a strategy interface, which is the interface of Zhuge Liang's three tricks up his sleeve to Zhao Yun * * / public interface IStrategy {/ / each trick is an executable algorithm public void operate (); then write three implementation classes, there are three tricks: package com.cbf4life.strategy / * ask Old Qiao to help prevent Sun Quan from killing Liu Bei * / public class BackDoor implements IStrategy {public void operate () {System.out.println ("ask Qiao Guotai for help and let Wu Guotai exert pressure on Sun Quan");}} package com.cbf4life.strategy;/*** asks Wu Guotai to give a green light * / public class GivenGreenLight implements IStrategy {public void operate () {System.out.println ("ask Wu Guotai to give a green light and let go!") ;} package com.cbf4life.strategy;/*** after the break, Mrs. Sun blocked the pursuers * / public class BlockEnemy implements IStrategy {public void operate () {System.out.println ("Mrs. Sun broke off, blocking the pursuers");}} well, let's see, we have three brilliant plans. We need a place to put these tricks and tricks: package com.cbf4life.strategy. / * if there is a trick, then there is also a kit * / public class Context {/ / constructor. You need to use that trick private IStrategy straegy; public Context (IStrategy strategy) {this.straegy = strategy;} / / use the trick, and I have come up with public void operate () {this.straegy.operate ();}}

Then Zhao Yun-hsiung valiantly carried three tricks and dragged Father Liu, who had entered the ranks of the elderly and was still thinking of marrying an innocent girl, into a nuisance. Hey, not to mention, Xiaoliang's three brilliant plans are really good, take a look:

Package com.cbf4life.strategy;public class ZhaoYun {/ * Zhao Yun appeared on the stage. According to the explanation given to him by Zhuge Liang, he took apart the clever plan * / public static void main (String [] args) {Context context; / / when he first arrived in the State of Wu and dismantled the first System.out.println ("- the first one when he arrived in the State of Wu -") Context = new Context (new BackDoor ()); / / get the clever plan context.operate (); / / disassemble and execute System.out.println ("\ n\ n") / / Liu Bei stopped thinking about Shu and took down the second System.out.println ("- Liu Bei didn't think about Shu anymore, he took down the second one -")

Context = new Context (new GivenGreenLight ()); context.operate ()

/ / the second kit has been executed.

System.out.println ("\ n\ n"); / / Sun Quan's Xiao Bing chased him, what should I do? Dismantle the third System.out.println ("- Sun Quan's little soldier chased it, what should I do?" Dismantle the third-"); context = new Context (new BlockEnemy ()); context.operate (); / / Mrs. Sun retired System.out.println ("\ n\ n ") / * * here comes the problem: Zhao Yun actually doesn't know which strategy it is. He only knows how to unpack the first bag, * but doesn't know it's BackDoor. What should I do?

It seems that this strategy pattern has written out the name of the strategy * * wrong! BackDoor, GivenGreenLight, BlockEnemy are just one code.

When you write first, second, third, no one will say you're wrong! * the advantage of the strategy model is that it embodies the characteristics of high cohesion and low coupling, but it has disadvantages. I'll check this and that again. "how to implement the java strategy pattern?" Thank you for your reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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