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javaenumsreturn
Mathew
Mathew

Reputation: 153

How to return enum value in java

How can I return enums like this?

Before I was returing an int with 0 if no, 1 if yes and 2 if other. But this wasn't good way to do. So how should it be done. My code:

class SomeClass{
   public enum decizion{
      YES, NO, OTHER
   }

   public static enum yourDecizion(){
      //scanner etc
      if(x.equals('Y')){
         return YES;
      }
      else if (x.equals('N')){
         return NO;
      }
      else{
         return OTHER;
      }
   }
}

Upvotes: 15

Views: 82262

Answers (4)

Eduardo
Eduardo

Reputation: 73

I think you should do something like these, an enum class. Then you can add as many types you want and the method yourDecizion() will return the enum type depending on the given parameter.

public enum SomeClass {

        YES(0),
        NO(1),
        OTHER(2);

    private int code;


    private SomeClass(int code) {
        this.code = code;
    }

    public int getCode() {
        return code;
    }

    public static SomeClass yourDecizion(int x) {
        SomeClass ret = null;
        for (SomeClass type : SomeClass.values()) {
            if (type.getCode() == x)
                ret = type;
        }
        return ret;
    }
}

Upvotes: 5

Tushar Girase
Tushar Girase

Reputation: 363

You can get the value in below way. Here you have private constructor which will initialize the value you want to set and when the instance method value gets invoked simply return this.key.

public class Application {
    enum Day {
        MONDAY("Monday"), TUESDAY("Tuesday");

        String key;

        Day(String str) {
            key = str;
        }

        public String value() {
            return this.key;
        }
    }

    public static void main(String[] args) {
        System.out.println(Day.MONDAY.value());
    }

}

Upvotes: 1

Konstantin Yovkov
Konstantin Yovkov

Reputation: 62864

I don't what the "//scanner etc." does, but the methods return type should be decizion:

    public static decizion yourDecizion() { ... }

Furthermore, you can add the Y, N, etc. values to the enum constants:

    public enum decizion{
         YES("Y"), NO("N"), OTHER;
          
         String key;
      
         decizion(String key) { this.key = key; }
     
         //default constructor, used only for the OTHER case, 
         //because OTHER doesn't need a key to be associated with. 
         decizion() { }

         static decizion getValue(String x) {
             if ("Y".equals(x)) { return YES; }
             else if ("N".equals(x)) { return NO; }
             else if (x == null) { return OTHER; }
             else throw new IllegalArgumentException();
         }
    }

Then, in the method, you can just do:

    public static decizion yourDecizion() {
        ...
       String key = ...
       return decizion.getValue(key);
    }

Upvotes: 16

Axel
Axel

Reputation: 14159

Change your code to:

class SomeClass{
   public enum decizion {
      YES, NO, OTHER
   }

   public static decizion yourDecizion(){
      //scanner etc
      if(x.equals('Y')){
         return decizion.YES;
      }
      else if (x.equals('N')){
         return decizion.NO;
      }
      else{
         return decizion.OTHER;
      }
   }
}

Note: The method return type must be decizion instead of enum and decizion should have an upper case name (as all classes should).

Upvotes: 1

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