建造者模式

public class 建造者模式 {
    public static void main(String[] args) {
        ChaofanDirector cd = new ChaofanDirector();
        Chaofan chaofan = cd.constructChaofan(new MoreEggChaofanBuilder());
        chaofan.print();
        chaofan = cd.constructChaofan(new SaltyChaofanBuilder());
        chaofan.print();
    }
}

enum Size { LITTLE, NORMAL, MUCH };

//Product
class Chaofan {
    public Size rice; //这里节省空间就不写getters/setters
    public Size egg;
    public Size spices;
    public Size stirfly;
    public void print() {
        System.out.println(rice + " Rice, " + egg + " Egg, " + spices + " Spices, " + stirfly + " Stirfly");
    }
}

//Builder
interface ChaofanBuilder {
    void addRice();
    void addEgg();
    void addSpices();
    void stirFly();
    Chaofan buildChaofan();
}

//ConcreteBuilder
class SaltyChaofanBuilder implements ChaofanBuilder {
    Chaofan chaofan;
    public SaltyChaofanBuilder() {
        chaofan = new Chaofan();
    }
    public void addRice() {
        chaofan.rice = Size.NORMAL;
    }
    public void addEgg() {
        chaofan.egg = Size.NORMAL;
    }
    public void addSpices() {
        chaofan.spices = Size.MUCH;
    }
    public void stirFly() {
        chaofan.stirfly = Size.NORMAL;
    }
    public Chaofan buildChaofan() {
        return chaofan;
    }
}

class MoreEggChaofanBuilder implements ChaofanBuilder {
    Chaofan chaofan;
    public MoreEggChaofanBuilder() {
        chaofan = new Chaofan();
    }
    public void addRice() {
        chaofan.rice = Size.NORMAL;
    }
    public void addEgg() {
        chaofan.egg = Size.MUCH;
    }
    public void addSpices() {
        chaofan.spices = Size.NORMAL;
    }
    public void stirFly() {
        chaofan.stirfly = Size.NORMAL;
    }
    public Chaofan buildChaofan() {
        return chaofan;
    }
}

//Director
class ChaofanDirector {
    public Chaofan constructChaofan(ChaofanBuilder cb) {
        cb.addRice();
        cb.addEgg();
        cb.addSpices();
        cb.stirFly();
        return cb.buildChaofan();
    }
}