Switch Statement给出了不兼容类型错误 [英] Switch Statement gives Incompatible Types error

问题描述

我正在尝试编译并收到此错误：

I am trying to compile and I get this error:

enigma/Rotor.java:30: incompatible types found : java.lang.String required: int     switch(name){
1 error

为什么我收到这个错误？我如何解决它？它在包中，我似乎无法弄明白。这是代码：

Why am I getting this error? How do I fix it? It's in the package and I can't seem to figure it out. Here's the code:

String label;

Rotor(){;}

Rotor(String name){
  switch(name){
    case "B":
      conversion_chart = B;
      break;
    case "C":
      conversion_chart = C;
      break;
    case "I":
      conversion_chart=I;
      notch = NOTCH[0];
      break;
    case "II":
      conversion_chart=II;
      notch = NOTCH[1];
      break;
    case "III":
      conversion_chart=III;
      notch = NOTCH[2];
      break;
    case "IV":
      conversion_chart=IV;
      notch = NOTCH[3];
      break;
    case "V":
      conversion_chart=V;
      notch = NOTCH[4];
      break;
    case "VI":
      conversion_chart=VI;
      notch = NOTCH[5];
      break;
    case "VII":
      notch = NOTCH[6];
      conversion_chart=VII;
      break;
    case "VIII":
      notch = NOTCH[7];
      conversion_chart=VIII;
      break;
  }
  label = name;
  position = 0;
}

推荐答案

switch(name)

开关从Java7开始仅支持带有String的语句。

switch statement with String is supported from Java7 onwards only.

我猜你使用的编译器版本小于Java7

I guess the compiler version you are using is less than Java7

选项：

1) You need to either upgrade to Java7 
2) Change switch statement to `if/else`
3) Use `int` in switch instead of `String`

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