Cast Int to enum in Java

Question

What is the correct way to cast an Int to an enum in Java given the following enum?

public enum MyEnum {     EnumValue1,     EnumValue2 }   MyEnum enumValue = (MyEnum) x; //Doesn't work??? 

Answer 1

Try MyEnum.values()[x] where x must be 0 or 1, i.e. a valid ordinal for that enum.

Note that in Java enums actually are classes (and enum values thus are objects) and thus you can't cast an int or even Integer to an enum.

Answer 2

MyEnum.values()[x] is an expensive operation. If the performance is a concern, you may want to do something like this:

public enum MyEnum {     EnumValue1,     EnumValue2;      public static MyEnum fromInteger(int x) {         switch(x) {         case 0:             return EnumValue1;         case 1:             return EnumValue2;         }         return null;     } }