Getting all names in an enum as a String

Question

What s the easiest and or shortest way possible to get the names of enum elements as an array of Strings   What I mean by this is that if  for example  I had the following enum   public enum State       NEW      RUNNABLE      BLOCKED      WAITING      TIMED WAITING      TERMINATED       public static String   names                              the names   method would return the array    NEW    RUNNABLE    BLOCKED    WAITING    TIMED WAITING    TERMINATED

User · Answer

You can get Enum String value by  quot Enum  name quot  public static String   names         return Arrays stream State values    map Enum  name  toArray String    new      This implementation does not require additional  quot function quot  and  quot field quot   Just add this function to get the result you want

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You can put enum values to list of strings and convert to array       List lt String gt  stateList   new ArrayList lt  gt                  for  State state  State values                      stateList add state toString                        String   stateArray   new String stateList size         stateArray   stateList toArray stateArray

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i d do it this way  but i d probably make names an unmodifiable set instead of an array    import java util Arrays  enum State       NEW RUNNABLE BLOCKED WAITING TIMED WAITING TERMINATED      public static final String   names new String values   length       static           State   values values            for int i 0 i lt values length i                names i  values i  name            public class So13783295       public static void main String   args            System out println Arrays asList State names

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Create a String   array for the names and call the static values   method which returns all the enum values  then iterate over the values and populate the names array   public static String   names         State   states   values        String   names   new String states length        for  int i   0  i  lt  states length  i              names i    states i  name               return names

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I would write it like this  public static String   names          java util LinkedList lt String gt  list   new LinkedList lt String gt         for  State s   State values              list add s name                return list toArray new String list size

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Just a thought  maybe you don t need to create a method to return the values of the enum as an array of strings   Why do you need the array of strings  Maybe you only need to convert the values when you use them  if you ever need to do that   Examples   for  State value values          System out println value      Just print it        for  State value values          String x   value toString       Just iterate and do something with x           If you just need to print the values  System out println Arrays toString State values

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Something like this would do   public static String   names       String   names   new String values   length     int index   0     for  State state   values          names index      state name           return names      The documentation recommends using toString   instead of name   in most cases  but you have explicitly asked for the name here

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Another ways    First one  Arrays asList FieldType values                 stream                map f - gt  f toString                 toArray String    new     Other way  Stream of FieldType values    map f - gt  f toString    toArray String    new

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Got the simple solution Arrays stream State values    map Enum  name  collect Collectors toList

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Here s one-liner for any enum class   public static String   getNames Class lt   extends Enum lt   gt  gt  e        return Arrays stream e getEnumConstants    map Enum  name  toArray String    new       Pre Java 8 is still a one-liner  albeit less elegant   public static String   getNames Class lt   extends Enum lt   gt  gt  e        return Arrays toString e getEnumConstants    replaceAll              split            That you would call like this   String   names   getNames State class      any other enum class will work   If you just want something simple for a hard-coded enum class   public static String   names         return Arrays toString State values    replaceAll              split

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Basing off from Bohemian s answer for Kotlin  Use replace   instead of replaceAll    Arrays toString MyEnum values    replace Regex  quot       quot     quot  quot   split  quot    quot   toTypedArray    Side note  Convert to  toTypedArray   for use in AlertDialog s setSingleChoiceItems  for example

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the ordinary way  pun intended    String   myStringArray new String EMyEnum values   length   for EMyEnum e EMyEnum values   myStringArray e ordinal    e toString

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Very similar to the accepted answer  but since I learnt about EnumSet  I can t help but use it everywhere  So for a tiny bit more succinct  Java8  answer  public static String   getNames Class lt   extends Enum lt   gt  gt  e      return EnumSet allOf e  stream   map Enum  name  toArray String    new

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Another way to do it in Java 7 or earlier would be to use Guava   public static String   names         return FluentIterable from values    transform Enum  name  toArray String class

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I have the same need and use a generic method  inside an ArrayUtils class    public static  lt T gt  String   toStringArray T   array        String   result new String array length       for int i 0  i lt array length  i             result i  array i  toString              return result      And just define a STATIC inside the enum     public static final String   NAMES   ArrayUtils toStringArray values       Java enums really miss a names   and get index  methods  they are really helpful

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With java 8   Arrays stream MyEnum values    map Enum  name                       collect Collectors toList    toArray

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org apache commons lang3 EnumUtils getEnumMap State class  keySet

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Here s an elegant solution using Apache Commons Lang 3   EnumUtils getEnumList State class    Although it returns a List  you can convert the list easily with list toArray

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If you can use Java 8  this works nicely  alternative to Yura s suggestion  more efficient    public static String   names         return Stream of State values    map State  name  toArray String    new

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If you want the shortest you can try  public static String   names         String test   Arrays toString values         return text substring 1  text length  -1  split

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Try this   public static String   vratAtributy         String   atributy   new String values   length       for int index   0  index  lt  atributy length  index              atributy index    values   index  toString              return atributy

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My solution  with manipulation of strings  not the fastest  but is compact    public enum State       NEW      RUNNABLE      BLOCKED      WAITING      TIMED WAITING      TERMINATED       public static String   names             String valuesStr   Arrays toString State values             return valuesStr substring 1  valuesStr length  -1  replace          split

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The easiest way    Category   category   Category values    for  int i   0  i  lt  cat length  i           System out println i      -     category i        Where Category is Enum name

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I did a bit test on  Bohemian s solution  The performance is better when using naive loop instead   public static  lt T extends Enum lt   gt  gt  String   getEnumNames Class lt T gt  inEnumClass       T    values   inEnumClass getEnumConstants        int len   values length      String   names   new String len       for int i 0 i lt values length i             names i    values i  name              return names       Bohemian s solution public static String   getNames Class lt   extends Enum lt   gt  gt  e        return Arrays stream e getEnumConstants    map Enum  name  toArray String    new

[java] Getting all names in an enum as a String[]

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