Created
November 8, 2019 03:47
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commons-chain
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| package patterns; | |
| import java.util.ArrayList; | |
| import java.util.List; | |
| /** | |
| * @author sikaizhang@xiaohongshu.com | |
| * @date 11/8/19 | |
| * @description patterns | |
| */ | |
| public class StrategyPattern { | |
| public static void main(String[] args) { | |
| House house = new iGlassHouse(); | |
| house.build(); | |
| System.out.println("*************"); | |
| house = new iWoodenHouse(); | |
| house.build(); | |
| } | |
| } | |
| interface Strategy{ | |
| void execute(); | |
| } | |
| class GlassWindowBuilder implements Strategy{ | |
| @Override | |
| public void execute() { | |
| System.out.println("建玻璃窗户"); | |
| } | |
| } | |
| class WoodWindowBuilder implements Strategy{ | |
| @Override | |
| public void execute() { | |
| System.out.println("建木窗户"); | |
| } | |
| } | |
| class GlassPillarBuilder implements Strategy{ | |
| @Override | |
| public void execute() { | |
| System.out.println("建玻璃支柱"); | |
| } | |
| } | |
| class WoodPillarBuilder implements Strategy{ | |
| @Override | |
| public void execute() { | |
| System.out.println("建木支柱"); | |
| } | |
| } | |
| abstract class House { | |
| // 有顺序的策略 | |
| private List<Strategy> builders = new ArrayList<>(); | |
| // template method, final so subclasses can't override | |
| abstract void init(); | |
| void addBuilder(Strategy builder){ | |
| builders.add(builder); | |
| } | |
| void build(){ | |
| this.init(); | |
| for(Strategy builder: builders){ | |
| builder.execute(); | |
| } | |
| } | |
| } | |
| class iWoodenHouse extends House { | |
| @Override | |
| void init() { | |
| this.addBuilder(new WoodPillarBuilder()); | |
| this.addBuilder(new WoodWindowBuilder()); | |
| } | |
| } | |
| class iGlassHouse extends House { | |
| @Override | |
| void init() { | |
| this.addBuilder(new GlassPillarBuilder()); | |
| this.addBuilder(new GlassWindowBuilder()); | |
| } | |
| } | |
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