静态工厂模式，抽象工厂模式，建造者模式

静态工厂模式

ublic class FruitFactory {public static Fruit getFruit(String name) {Fruit f=null;switch (name){case "APPLE":{f=new Apple();}case "BANANA":{f=new Banana();}default :{System.out.println("Unknown Fruit");}}return f;}
}

抽象工厂模式

 建造者模式

public class MealBuilder {
public Meal suMeal() {Meal m=new Meal();m.additeam(new SuBuger());m.additeam(new bing());return m;
}public Meal rouMeal() {Meal m=new Meal();m.additeam(new bing());m.additeam(new RouBuger());m.additeam(new RouBuger());m.additeam(new RouBuger());return m;}public Meal haohua(){Meal m=new Meal();m.additeam(new bing());m.additeam(new RouBuger());m.additeam(new RouBuger());m.additeam(new SuBuger());return m;}
}

public class Meal {
private ArrayList<iteam> iteams=new ArrayList<iteam>();
public void additeam(iteam i) {iteams.add(i);
}
public double getCost() {return iteams.stream().mapToDouble(iteam::price).sum();
}
public void showItems() {iteams.stream().forEach(e->{System.out.println(e.name());e.packing().pack();System.out.println(e.price());});
}
}

public interface iteam {
String name();
Packing packing();
double price();
} 

public class Main {public static void main(String[] args) {MealBuilder builder=new MealBuilder();Meal haohua=builder.haohua();double cost=haohua.getCost();System.out.println("total"+cost);haohua.showItems();}
}

public abstract class ClodDrink  implements iteam{@Overridepublic Packing packing() {return new Bottle();}
}

public interface Packing {void pack();
}

public class Wapper implements Packing{@Overridepublic void pack() {// TODO Auto-generated method stubSystem.out.println("用纸包装");}}

public class bing extends ClodDrink{@Overridepublic String name() {// TODO Auto-generated method stubreturn "北冰洋";}@Overridepublic double price() {return 3.0;}}

total15.5
北冰洋
用瓶子包装
3.0
肉的
用纸包装
5.0
肉的
用纸包装
5.0
素的
用纸包装
2.5