Switch 语句给出不兼容类型错误

2022-01-19 00:00:00 switch-statement java

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

为什么会出现此错误?我如何解决它?它在包装中，我似乎无法弄清楚.代码如下:

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)

switch 语句仅从 Java7 开始支持.

switch statement with String is supported from Java7 onwards only.

我猜你使用的编译器版本低于Java7

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

选项:

  1. 您需要升级到 Java7
  2. 将 switch 语句更改为 if/else
  3. 在 switch 中使用 int 而不是 String

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