How to match and switch Strings against enums?

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Lookup Java enum by string value 23 answers

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首先， Letter必须是一个枚举：

enum Letter {
    A, B, C
}

Letter letter = Letter.valueOf("A")
// and just switch
switch (letter) {
    case A:
    case B:
    case C:
}

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You can do it like this:

String letter = "A";
switch (Letter.valueOf(letter)) {
    case A: // No problem!
    case B:
    case C:
    default:
}

Demo on ideone.

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首先让该枚举代替类替换为此

Letter obj = Letter.valueOf(letter);
switch (obj) {
    case A: //cannot convert from Letter to String
    case B: //case expressions must be constant expressions
    case C: //case expressions must be constant expressions
    default:

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