设计模式-15-建造者模式

简介：将一个复杂对象的构建与它的表示分离，使得同样的构建过程可以创建不同的表示。

目的：

总结：使得对象的构建与表示分离        CreateHuman和BuilderServiceImpl分离

组成：构建器， 表示接口，接口实现

1，基础类

package com.design.o.builder;
/**
 * 人体构造
 */
public class Human {
    
    private String userName;
    
    private String head; //头
    private String body; //身体
    private String hand; //手
    private String foot; //脚
    
    public Human(String userName) {
        super();
        this.userName = userName;
    }
    

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getHead() {
        return head;
    }

    public void setHead(String head) {
        this.head = head;
    }

    public String getBody() {
        return body;
    }

    public void setBody(String body) {
        this.body = body;
    }

    public String getHand() {
        return hand;
    }

    public void setHand(String hand) {
        this.hand = hand;
    }

    public String getFoot() {
        return foot;
    }

    public void setFoot(String foot) {
        this.foot = foot;
    }

    @Override
    public String toString() {
        return userName;
    }
    
}

2，表示接口

package com.design.o.builder;
/**
 * 建造者接口
 */
public interface BuilderService {
    
    void createHuman(String userName);
    Human getHuman();
    
    void createHead();
    void createBody();
    void createHand();
    void createFoot();
    
}

3，表示接口实现

package com.design.o.builder;

public abstract class BuilderServiceImpl implements BuilderService {
    
    private Human human;
    protected String bodyType;
    
    @Override
    public void createHuman(String userName) {
        human = new Human(userName);
    }

    @Override
    public Human getHuman() {
        
        try{
            return human;
        }finally{
            human = null;
        }
    }

    @Override
    public void createHead() {
        printInfo("head");
        human.setHand(bodyType + "head");
    }

    @Override
    public void createBody() {
        printInfo("body");
        human.setBody(bodyType + "body");
    }

    @Override
    public void createHand() {
        printInfo("hand");
        human.setHand(bodyType + "hand");
    }

    @Override
    public void createFoot() {
        printInfo("foot");
        human.setFoot(bodyType + "foot");
    }

    private void printInfo(String info){
        System.out.println("创建  - "+bodyType+"- 用户: " + human.getUserName() + " 的" + info);
    }
}

package com.design.o.builder;
/**
 * 偏胖型 - 用户创建 
 */
public class FatBuilderServiceImpl extends BuilderServiceImpl {
    
    private static final String BODY_TYPE = "偏胖型";
    
    public FatBuilderServiceImpl() {
        super.bodyType = BODY_TYPE;
    }

}

package com.design.o.builder;
/**
 * 偏瘦型 - 用户创建 
 */
public class ThinBuilderServiceImpl extends BuilderServiceImpl {
    
    private static final String BODY_TYPE = "偏瘦型";
    
    public ThinBuilderServiceImpl(){
        super.bodyType = BODY_TYPE;
    }

}

4，构建器

package com.design.o.builder;
/**
 * 建造者模式
 */
public class CreateHuman {

    public Human createHuman(BuilderService builderService, String userName){
        
        builderService.createHuman(userName);
        builderService.createHead();
        builderService.createBody();
        builderService.createHand();
        builderService.createFoot();
        return builderService.getHuman();
    }
}

5，Main

package com.design.o.builder;
/**
 * 建造者模式
 * 
 * 目的: 使得对象的构建与表示分离        CreateHuman和BuilderServiceImpl分离
 */
public class MainTest {
    
    public static void main(String[] args) {
        
        CreateHuman human = new CreateHuman();
        System.out.println(human.createHuman(new FatBuilderServiceImpl(), "小胖子"));;
        System.out.println(human.createHuman(new ThinBuilderServiceImpl(), "小瘦子"));;
        
    }

}

6，Result

创建  - 偏胖型- 用户: 小胖子 的head
创建  - 偏胖型- 用户: 小胖子 的body
创建  - 偏胖型- 用户: 小胖子 的hand
创建  - 偏胖型- 用户: 小胖子 的foot
小胖子

创建  - 偏瘦型- 用户: 小瘦子 的head
创建  - 偏瘦型- 用户: 小瘦子 的body
创建  - 偏瘦型- 用户: 小瘦子 的hand
创建  - 偏瘦型- 用户: 小瘦子 的foot
小瘦子