Java中的Enum中为null

Question

I have 3 enum types for a functionality in my controller. Also, have set proper checks on UI. BUT, if someone tests the API with a value equal to null then I don't know how to handle that.

Here's the code:

public enum AuthStatus implements Comparable<AuthStatus> {
    ABC("test", "testtt", -1), 
    DEF("tesds", "dsds", 0), 
    .
    .

If ABC or DEF in given in the payload, everything works fine, what to do if nothing is given in payload,ie "".

Basically, I want to add "" as an enum type, eg:

ABC("test", "testtt", 2), 
DEF("tesds", "dsds", 0), 
""("invalid", "Not Valid", -1) // What should be replaced by "".

Answer 1

Enum names have to be valid Java identifiers, and there is no valid Java identifier that has zero characters length.

If you want to match input against some value, then using a Java enum name to express that is not a good idea, as there are many more limitation to Java identifiers (can't contain spaces nor many other characters). You should add another field to your enum, you could call it matchValue , and match your input against that value rather than against the enum name.

public enum AuthStatus implements Comparable<AuthStatus> {
    ABC("ABC", "test", "testtt", -1), 
    INVALID("", "invalid", "Not Valid", -1);

    private final String matchValue;

    private AuthStatus(String matchValue, ...) {
        this.matchValue = matchValue;
    }
}