Get enum values as List of String in Java 8

Question

Is there any Java 8 method or easy way  which returns Enum values as a List of String  like   List lt String gt  sEnum   getEnumValuesAsString

User · Accepted Answer

You can do  pre-Java 8    List lt Enum gt  enumValues   Arrays asList Enum values       or   List lt Enum gt  enumValues   new ArrayList lt Enum gt  EnumSet allOf Enum class      Using Java 8 features  you can map each constant to its name   List lt String gt  enumNames   Stream of Enum values                                    map Enum  name                                  collect Collectors toList

User · Answer

You could also do something as follow  public enum DAY  MON  TUES  WED  THU  FRI  SAT  SUN   EnumSet allOf DAY class  stream   map e - gt  e name    collect Collectors toList      or   EnumSet allOf DAY class  stream   map DAY  name  collect Collectors toList      The main reason why I stumbled across this question is that I wanted to write a generic validator that validates whether a given string enum name is valid for a given enum type  Sharing in case anyone finds useful    For the validation  I had to use Apache s EnumUtils library since the type of enum is not known at compile time     SuppressWarnings    unchecked    rawtypes     public static void isValidEnumsValid Class clazz  Set lt String gt  enumNames        Set lt String gt  notAllowedNames   enumNames stream                filter enumName - gt   EnumUtils isValidEnum clazz  enumName                collect Collectors toSet          if  notAllowedNames size    gt  0            String validEnumNames    String  EnumUtils getEnumMap clazz  keySet   stream                collect Collectors joining                  throw new IllegalArgumentException  The requested values      notAllowedNames stream                    collect Collectors joining            are not valid  Please select one more  case-sensitive                       of the following       validEnumNames             I was too lazy to write an enum annotation validator as shown in here https   stackoverflow com a 51109419 1225551

[java] Get enum values as List of String in Java 8

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