设计模式之工厂模式

public class JavaFactoryDemo {
    public static void main(String[] args) {
        String className = "milk";
        IFood iFood = Factory.getInstance(className);
        iFood.eat();
    }
}

interface IFood{
    public void eat();
}

class Banana implements IFood{
    public void eat(){
        System.out.println("吃香蕉");
    }
}

class Milk implements IFood{
    public void eat(){
        System.out.println("喝牛奶");
    }
}

class Factory{
    public static IFood getInstance(String className){
        if("banana".equals(className)){
            return new Banana();
        }else if("milk".equals(className)){
            return new Milk();
        }else{
            return null;
        }
    }
}

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