在 switch-case 中使用枚举值的字符串表示

用户注册

投稿取消

文章分类:

还能输入300字

上传中....

问题描述

为什么不能在 switch case 中使用枚举值作为字符串?(或者这有什么问题:)

Why is it not possible to use enum values as strings in a switch case? (Or what is wrong with this:)

String argument;
switch (argument) {
    case MyEnum.VALUE1.toString(): // Isn't this equal to "VALUE1" ?
    // something    
break;
    case MyEnum.VALUE2.toString():
    // something else
break;

推荐答案

只能使用编译时已知的字符串.编译器无法确定该表达式的结果.

You can only use strings which are known at compile time. The compiler cannot determine the result of that expression.

也许你可以试试

String argument = ...
switch(MyEnum.valueOf(argument)) {
   case VALUE1:

   case VALUE2: