Using Enum values as String literals

Question

What is the best way to use the values stored in an Enum as String literals  For example   public enum Modes       some-really-long-string      mode1      mode2      mode3     Then later I could use Mode mode1 to return its string representation as mode1  Without having to keep calling Mode mode1 toString

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For my enums I don t really like to think of them being allocated with 1 String each   This is how I implement a toString   method on enums   enum Animal       DOG  CAT  BIRD      public String toString            switch  this                case DOG  return  Dog               case CAT  return  Cat               case BIRD  return  Bird                     return null

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Enum is just a little bit special class  Enums can store additional fields  implement methods etc  For example  public enum Modes       mode1  a        mode2  b        mode3  c              char c       private Modes char c            this c   c            public char character             return c            Now you can say   System out println Modes mode1 character     and see output   a

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You can simply use       Modes mode1

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public enum Modes     MODE1  Mode1      MODE2  Mode2      MODE3  Mode3      private String value   public String getValue         return value        private Modes String value      this value   value          you can make a call like below wherever you want to get the value as a string from the enum   Modes MODE1 getvalue      This will return  Mode1  as a String

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i found this one is more easy for preventing type error   public enum Modes       some-really-long-string      mode1      mode2      mode3       String str       Modes            this str   super name                Override      NonNull     public String toString             return str          however - this may work when you need to use a String on a log println or whenever java compiles the toString   method automatically  but on a code line like this -      sample method that require  string value  intent putExtra Modes mode1  shareElement getMode        java error    first argument enum does not return value   instead as mentioned above you will still have to extend the enum and use  name    in those cases like this   intent putExtra Modes mode1 name    shareElement getMode

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As Benny Neugebauer mentions  you could overwrite the toString    However instead overwriting the toString for each enum field I like more something like this   public enum Country      SPAIN  Espa  a        ITALY  Italia        PORTUGAL  Portugal          private String value       Country final String value            this value   value             public String getValue             return value              Override     public String toString             return this getValue              You could also add a static method to retrieve all the fields  to print them all  etc  Simply call getValue to obtain the string associated to each Enum item

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You could override the toString   method for each enum value   Example   public enum Country      DE        Override     public String toString           return  Germany                IT        Override     public String toString           return  Italy                US        Override     public String toString           return  United States                  Usage   public static void main String   args      System out println Country DE      Germany   System out println Country IT      Italy   System out println Country US      United States

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You can t  I think you have FOUR options here  All four offer a solution but with a slightly different approach     Option One  use the built-in name   on an enum  This is perfectly fine if you don t need any special naming format       String name   Modes mode1 name       Returns the name of this enum constant  exactly as declared in its enum declaration    Option Two  add overriding properties to your enums if you want more control  public enum Modes       mode1   Fancy Mode 1        mode2   Fancy Mode 2        mode3   Fancy Mode 3         private final String name              private Modes String s            name   s             public boolean equalsName String otherName                otherName    null  check is not needed because name equals null  returns false          return name equals otherName              public String toString            return this name            Option Three  use static finals instead of enums    public final class Modes        public static final String MODE 1    Fancy Mode 1       public static final String MODE 2    Fancy Mode 2       public static final String MODE 3    Fancy Mode 3        private Modes           Option Four  interfaces have every field public  static and final   public interface Modes        String MODE 1    Fancy Mode 1       String MODE 2    Fancy Mode 2       String MODE 3    Fancy Mode 3

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package com common test   public  enum Days         monday 1  Monday   tuesday 2  Tuesday   wednesday 3  Wednesday        thrusday 4  Thrusday   friday 5  Friday   saturday 6  Saturday   sunday 7  Sunday         private int id      private String desc        Days int id String desc           this id id          this desc desc             public static String getDay int id            for  Days day   Days values                  if  day getId      id                    return day getDesc                                    return null             public int getId             return id             public void setId int id            this id   id             public String getDesc             return desc             public void setDesc String desc            this desc   desc

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This method should work with any enum   public enum MyEnum       VALUE1      VALUE2      VALUE3       public int getValue             return this ordinal               public static DataType forValue int value            return values   value              public String toString             return forValue getValue    name

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mode1 name   or String valueOf mode1   It doesn t get better than that  I m afraid

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You can use Mode mode1 name   however you often don t need to do this   Mode mode   System out println  The mode is   mode

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public enum Environment       PROD  https   prod domain com 1088         SIT  https   sit domain com 2019         CIT  https   cit domain com 8080         DEV  https   dev domain com 21323          private String url       Environment String envUrl            this url   envUrl             public String getUrl             return url           String prodUrl   Environment PROD getUrl      It will print   https   prod domain com 1088    This design for enum string constants works in most of the cases

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my solution for your problem   import java util HashMap  import java util Map   public enum MapEnumSample       Mustang  One of the fastest cars in the world          Mercedes  One of the most beautiful cars in the world          Ferrari  Ferrari or Mercedes  which one is the best          private final String description      private static Map lt String  String gt  enumMap       private MapEnumSample String description            this description   description             public String getEnumValue             return description             public static String getEnumKey String name            if  enumMap    null                initializeMap                      return enumMap get name              private static Map lt String  String gt  initializeMap             enumMap   new HashMap lt String  String gt             for  MapEnumSample access   MapEnumSample values                  enumMap put access getEnumValue    access toString                       return enumMap             public static void main String   args                getting value from Description         System out println MapEnumSample getEnumKey  One of the fastest cars in the world                  getting value from Constant         System out println MapEnumSample Mustang getEnumValue              System out println MapEnumSample getEnumKey  One of the most beautiful cars in the world              System out println MapEnumSample Mercedes getEnumValue                 doesnt exist in Enum         System out println  Mustang or Mercedes  which one is the best             System out println MapEnumSample getEnumKey  Mustang or Mercedes  which one is the best       null    I don t know      I believe that                     MapEnumSample getEnumKey  Ferrari or Mustang  which one is the best        is the best                  exists in Enum         System out println  Ferrari or Mercedes  wich one is the best             System out println MapEnumSample getEnumKey  Ferrari or Mercedes  which one is the best       null    I don t know      I believe that                     MapEnumSample getEnumKey  Ferrari or Mercedes  which one is the best        is the best

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You can try this   public enum Modes       some-really-long-string      mode1      mode2      mode3       public String toString            switch this                case some-really-long-string                  return  some-really-long-string               case mode2                  return  mode2               default  return  undefined

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use mode1 name   or String valueOf Modes mode1

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As far as I know  the only way to get the name would be  Mode mode1 name      If you really need it this way  however  you could do   public enum Modes       mode1   Mode1        mode2   Mode2        mode3   Mode3         private String name              private Modes String s            name   s

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after many tries I have come with this solution  public static enum Operation        Addition  Subtraction  Multiplication  Division        public String getUserFriendlyString             if  this  Addition                return                  else if  this  Subtraction                return   -              else if  this  Multiplication                return                  else if  this  Division                return                          return  undefined

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Every enum has both a name   and a valueOf String  method  The former returns the string name of the enum  and the latter gives the enum value whose name is the string  Is this like what you re looking for   String name   Modes mode1 name    Modes mode   Modes valueOf name     There s also a static valueOf Class  String  on Enum itself  so you could also use  Modes mode   Enum valueOf Modes class  name

[java] Using Enum values as String literals

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