switch 选择因子只能为 整数！！
今天练习工厂模式，根据传入的字符串连选择生成的对象，看教材上写的是用if条件选择语句来进行的，自己想着用其他的方法来写一下，就选择 用switch语句，由于选择因子是字符串，编译器老报错，于是查了一下资料，表面switch的选择因子只能是整数 。
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package interfaces.fruit;public class FruitGardener {public static Fruit Factory(String which) throws BadFruitException{/*switch(which){default:throw new BadFruitException("bad fruit request");case(which.equalsIgnoreCase("Apple")):return new Apple();case(which.equalsIgnoreCase("Grape")):return new Grape();case(which.equalsIgnoreCase("StrawBerry")):return new StrawBerry();}*/if(which.equalsIgnoreCase("Apple")){return new Apple();}else if(which.equalsIgnoreCase("Grape")){return new Grape();}else if(which.equalsIgnoreCase("StrawBerry")){return new StrawBerry();}else{throw new BadFruitException("bad fruit request");}}public static void main(String[] args) {}}?