Getting Enum value by another value

Question

I have the following enum that contains two values, a string identifier and a boolean valid status. I would like to be able to get the status value by using the string identifier.

Has anyone got any suggestions what I can add to the code below?

public enum MyEnum {

    TYPEA("001", true),
    TYPEB("002", false);
    
    private final String identifier;
    private final boolean valid;

    MyEnum(String identifier, boolean valid) {
        this.identifier = identifier;
        this.valid = valid;
    }
}

Does this answer your question? [How to get the enum type by its attribute?](https://stackoverflow.com/questions/7888560/how-to-get-the-enum-type-by-its-attribute) — kasptom, Dec 09 '20 at 16:20

dreamcrash · Accepted Answer · 2020-12-09T17:36:07.623

The ENUM types has the method values, which you can use to extract all the enum values and compare their identifier against the one that you have passed by the method parameter, namely:

public MyEnum getEnum(String identifier){
      for(MyEnum e : MyEnum.values())
         if(e.identifier.equals(identifier))
            return e;
      return null;
 }

or even better:

public static Optional<MyEnum> getEnum(String identifier){
        return Arrays.stream(MyEnum.values()).filter(i -> i.identifier.equals(identifier)).findFirst();
}

This way you make it clear on the method signature that you might or not find the enum.

score 1 · Answer 2 · answered Dec 09 '20 at 16:23

public enum MyEnum {

   TYPEA("001", true),
   TYPEB("002", false);

   private final String identifier;
   private final boolean valid;

   MyEnum(String identifier, boolean valid) {
       this.identifier = identifier;
       this.valid = valid;
   }

   public static MyEnum getFromIdentifier(String identifier) {
       return Arrays.stream(MyEnum.values()).filter(item -> item.identifier.equals(identifier)).findFirst().orElse(null);
   }
}

Getting Enum value by another value

2 Answers2