CODEWITHSUNDEEP
javaenumsswitch-statement
WolfiG
WolfiG

Reputation: 1163

Use of enum in switch case but not as switch-argument

I want to use the following enum as reference in a switch case:

public final enum myEnum {
    VALUE1,
    VALUE2,
    VALUE2,
    ...
}

I searched the internet already quite some time, but found only examples where the enum is used in the switch statement and the case stament as argument. I want to use only the values of the enum as argument of the case statements, the switch argument is another variable. Something like this:

String otherVariable = "VALUE2";
switch (otherVariable) {
    case myEnum,VALUE1.toString():
        ...
        break;
    case myEnum,VALUE2.toString():
        ...
        break;
    default:
        ...
        break;

When I code this straight forward, I get an error "case expressions must be constant expressions". What am I doing wrong? How do I implement this?

Kind regards WolfiG

Upvotes: 1

Views: 618

Answers (1)

daniu
daniu

Reputation: 14999

What you want is probably 

String other = "VALUE2";

MyEnum myEnum = MyEnum.valueOf(other);
switch (myEnum) {
    case VALUE1:
    ...
    case VALUE2:
    ...
}

You can't use myEnum.toString() because it's a method call, which can create different results between calls (ie non-constant).

Upvotes: 6

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