Convert String to equivalent Enum value

Question

Is it possible for me to convert a String to an equivalent value in an Enumeration  using Java   I can of course do this with a large if-else statement  but I would like to avoid this if possible   Given this documentation   http   download oracle com javase 1 4 2 docs api java util Enumeration html  I am not too hopeful that this is possible without ifs or a case statement

User · Accepted Answer

Hope you realise  java util Enumeration is different from the Java 1 5 Enum types   You can simply use YourEnum valueOf  String   to get the equivalent enum type   Thus if your enum is defined as so   public enum Day       SUNDAY  MONDAY  TUESDAY  WEDNESDAY       THURSDAY  FRIDAY  SATURDAY     You could do this   String day    SUNDAY    Day dayEnum   Day valueOf day

User · Answer

Use static method valueOf String  defined for each enum   For example if you have enum MyEnum you can say MyEnum valueOf  foo

User · Answer

I might ve over-engineered my own solution without realizing that Type valueOf  enum string   actually existed   I guess it gives more granular control but I m not sure it s really necessary   public enum Type       DEBIT      CREDIT       public static Map lt String  Type gt  typeMapping   Maps newHashMap        static           typeMapping put DEBIT name    DEBIT           typeMapping put CREDIT name    CREDIT              public static Type getType String typeName            if  typeMapping get typeName     null                throw new RuntimeException String format  There is no Type mapping with name   s                        return typeMapping get typeName             I guess you re exchanging IllegalArgumentException for RuntimeException  or whatever exception you wish to throw  which could potentially clean up code

User · Answer

Assuming you use Java 5 enums  which is not so certain since you mention old Enumeration class   you can use the valueOf method of java lang Enum subclass   MyEnum e   MyEnum valueOf  ONE OF CONSTANTS

[java] Convert String to equivalent Enum value

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