Is there a way to enforce that you're switching over all defined values of an enum in Java? -

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• how ensure completeness in enum switch @ compile time? 9 answers

suppose have enum 3 values:

enum colors { red, green, blue } 

you switch on values of in method, thinking you've handled cases:

switch (colors) {     case red: ...     case green: ...     case blue: ... } 

then later, add new value enum:

enum colors { red, green, blue, yellow } 

and still compiles fine, except you're silently missing case yellow in method. there way raise compile-time error in such scenario?

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edit: not understand why marked dupe of can add , remove elements of enumeration @ runtime in java. since answer there "no", means should possible know @ compile-time values of enum, , therefore i'm asking should possible compiler/some code analysis tool implement, right?

that depends on compiler. eclipse ide built-in compiler can configured raise error in case.

windows/preferences java compiler errors/warnings "incomplete 'switch' cases on enum" can set "error".

edit:

there sub-option "signal if 'default' case exists".