【设计模式06】建造者模式

鼠鼠我呀22025-07-04 9:51
前言

没什么用，类似于builder.build
UML类图

代码示例

java 复制代码
package com.sw.learn.pattern.B_create.e_builder;

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        for (int i = 0; i < n; i++) {
            String bicycleType = sc.next();
            AbsBicycleBuilder bicycleBuilder = null;
            if ("mountain".equals(bicycleType)) {
                bicycleBuilder = new MountainBicycleBuilder();
            }
            if ("road".equals(bicycleType)) {
                bicycleBuilder = new RoadBicycleBuilder();
            }
            if (bicycleBuilder == null) {
                break;
            }
            Bicycle bicycle = bicycleBuilder.build();
            System.out.println(bicycle.getFrame() + " " + bicycle.getTires());
        }
    }
}

class Bicycle {
    private String frame;
    private String tires;

    public String getFrame() {
        return frame;
    }

    public void setFrame(String frame) {
        this.frame = frame;
    }

    public String getTires() {
        return tires;
    }

    public void setTires(String tires) {
        this.tires = tires;
    }
}

abstract class AbsBicycleBuilder {
    protected Bicycle bicycle = new Bicycle();

    abstract public void buildFrame();

    abstract public void buildTires();

    abstract public Bicycle build();
}

class MountainBicycleBuilder extends AbsBicycleBuilder {

    @Override
    public void buildFrame() {
        bicycle.setFrame("Aluminum Frame");
    }

    @Override
    public void buildTires() {
        bicycle.setTires("Knobby Tires");
    }

    @Override
    public Bicycle build() {
        buildFrame();
        buildTires();
        return bicycle;
    }
}

class RoadBicycleBuilder extends AbsBicycleBuilder {
    @Override
    public void buildFrame() {
        bicycle.setFrame("Carbon Frame");
    }

    @Override
    public void buildTires() {
        bicycle.setTires("Slim Tries");
    }

    @Override
    public Bicycle build() {
        buildFrame();
        buildTires();
        return bicycle;
    }
}