What s the proper way to compare a String to an enum value

Question

Homework  Rock Paper Scissors game   I ve created an enumeration         enum Gesture ROCK PAPER SCISSORS     from which I want to compare values to decide who wins--computer or human  Setting the values works just fine  and the comparisons work properly  paper covers rock  rock crushes scissors  scissors cuts paper   However  I cannot get my tie to work  The user is declared as the winner any time there s a tie   Ahhh   crap   this will clarify  userPick is a String with values rock  paper  or scissors  I m unable to use    to compare userPick to computerPick  which  as you can see below  is cast as type Gesture from my enum         if computer    1           computerPick   Gesture ROCK        else          if computer    2             computerPick   Gesture PAPER           else            computerPick   Gesture SCISSORS        if userPick equals computerPick                      msg    tie               tieGames                      etc       I am guessing that there s an issue with rock not being equal to ROCK  or the String userPick not being able to match Gesture computerPick because the latter isn t a String  However  I m not able to find an example of a similar circumstance in my textbook or Oracle s Java Tutorials  so I m not sure how to correct the problem     Any hints

User · Answer

Define enum  public enum Gesture       ROCK  PAPER  SCISSORS     Define a method to check enum content  private boolean enumContainsValue String value        for  Gesture gesture   Gesture values                  if  gesture name   equals value                         return true                       return false     And use it  String gestureString    quot PAPER quot    if  enumContainsValue gestureString         Gesture gestureId   Gesture valueOf gestureString        switch  gestureId                case ROCK              Log i  quot TAG quot    quot ROCK quot                break           case PAPER              Log i  quot TAG quot    quot PAPER quot                break           case SCISSORS              Log i  quot TAG quot    quot SCISSORS quot                break

User · Answer

This is my solution in java 8   public static Boolean isValidCity String cityCode            return Arrays stream CITY ENUM values                     map CITY ENUM  getCityCode                   anyMatch cityCode  equals

User · Answer

This seems to be clean   public enum Plane          BOEING 747 plane      BOEING 747  BOEING 747            AIRBUS A380 Plane      AIRBUS A380  AIRBUS A380        private final String plane          private Plane final String plane        this plane  plane     Plane         plane null              toString method          return Value of this Enum as String       Override public String toString       return plane            This method add support to compare Strings with the equalsIgnoreCase String method         Replicated functionality of the equalsIgnorecase of the java lang String class         param value String to test      return True if equal otherwise false      public boolean equalsIgnoreCase final String value       return plane equalsIgnoreCase value       And then in main code   String airplane  BOEING 747    if Plane BOEING 747 equalsIgnoreCase airplane           code

User · Answer

public class Main        enum Vehical          Car          Bus          Van            public static void main String   args          String vehicalType    CAR            if vehicalType equals Vehical Car name                  System out println  The provider is Car                    String vehical Type    BUS           if vehical Type equals Vehical Bus toString                  System out println  The provider is Bus

User · Answer

Doing an static import of the GestureTypes and then using the valuesOf   method could make it look much cleaner   enum GestureTypes ROCK PAPER SCISSORS     and  import static com example GestureTypes    public class GestureFactory        public static Gesture getInstance final String gesture            if  ROCK    valueOf gesture                 do somthing         if  PAPER    valueOf gesture                 do somthing

User · Answer

You can compare a string to an enum item as follow   public class Main        enum IaaSProvider          aws          microsoft          google            public static void main String   args            IaaSProvider iaaSProvider   IaaSProvider google           if  google  equals iaaSProvider toString                  System out println  The provider is google

User · Answer

I m gathering from your question that userPick is a String value  You can compare it like this   if  userPick equalsIgnoreCase computerPick name             As an aside  if you are guaranteed that computer is always one of the values 1  2  or 3  and nothing else   you can convert it to a Gesture enum with   Gesture computerPick   Gesture values   computer - 1

User · Answer

You can do it in a simpler way   like the below   boolean IsEqualStringandEnum  String str Enum enum      if  str equals enum toString          return true    else      return false

User · Answer

You should declare toString   and valueOf   method in enum       import java io Serializable   public enum Gesture implements Serializable       ROCK PAPER SCISSORS       public String toString            switch this           case ROCK               return  Rock           case PAPER               return  Paper           case SCISSORS               return  Scissors                     return null             public static Gesture valueOf Class lt Gesture gt  enumType  String value           if value equalsIgnoreCase ROCK toString                 return Gesture ROCK          else if value equalsIgnoreCase PAPER toString                 return Gesture PAPER          else if value equalsIgnoreCase SCISSORS toString                 return Gesture SCISSORS          else             return null

User · Answer

You can use equals     enum equals String

User · Answer

My idea   public enum SomeKindOfEnum      ENUM NAME  initialValue         private String value       SomeKindOfEnum String value           this value   value             public boolean equalValue String passedValue           return this value equals passedValue             And if u want to check Value u write   SomeKindOfEnum ENUM NAME equalValue  initialValue     Kinda looks nice for me     Maybe somebody will find it useful

[java] What's the proper way to compare a String to an enum value?

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