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Paul
Paul

Reputation: 5974

Get index of enum from string?

I have a string value, I also have an array of strings and an enum containing the range also. To get the index of the string in the array, from the value supplied I write this:

Arrays.asList(myClass.BAUD_RATES).indexOf(username)

How do I do this for an enum? Can I use ordinal? Or do i have to make my own method?

The method might go like:

public enum Fruit {
   ...
   static public boolean isMember(String aName) {
       Fruit[] aFruits = Fruit.values();
       for (Fruit aFruit : aFruits)
           if (aFruit.fruitname.equals(aName))
               return aFruit;
       return false;
   }
   ...
}

Upvotes: 42

Views: 104093

Answers (7)

Gowtham Sooryaraj
Gowtham Sooryaraj

Reputation: 3907

It's really simple

TestEnum test = TestEnum.c;
log(test.index.toString());

enum TestEnum{
  c,d
}

Upvotes: 1

Pshemo
Pshemo

Reputation: 124235

Not sure if I understand you correctly but based on question title you may be looking for

YourEnum.valueOf("VALUE").ordinal(); 
//like Directions.valueOf("NORTH").ordinal();
  1. YourEnum.valueOf("VALUE") returns enum value with name "VALUE"
  2. each enum value knows its position (indexed from zero) which we can get by calling ordinal() method on it.

Upvotes: 129

Nidhin Mahesh A
Nidhin Mahesh A

Reputation: 51

Adding here the solution that worked for me:

YourEnum.values.indexOf("VALUE");

Upvotes: 0

Sathishkumar J
Sathishkumar J

Reputation: 81

Try this simple solution:

Fruit.values()[index]

Upvotes: 7

anshul6297
anshul6297

Reputation: 25

The following logic will also work.

If you want to check and you know the fruitname already don't use for loop go with the approach mentioned by Pshemo

for (Fruit aFruit : aFruits)
           if (aFruit.name().equals(aName))
               return aFruit.ordinal();

Upvotes: 0

Divya Motiwala
Divya Motiwala

Reputation: 1669

If you want to retrieve the index, you can use ordinal. If you want to assign some specific value to String, you may define your own method to retrieve it.

 enum DAY
 {
  MONDAY(10),
  TUESDAY(20);
  int value;
  DAY(int x)
  {
   this.value = x;
  }
  public int getValue()
  {
    return value;
   }

Now value and ordinal can be retrieved as :

    for(DAY s : DAY.values() )
    {
        System.out.println(s.ordinal());
        System.out.println(s.getValue());
    }

Upvotes: 2

Alban Dericbourg
Alban Dericbourg

Reputation: 1636

I might not understand you question, but the same code works for enums too:

int index = Arrays.asList(YourEnum.values()).indexOf(YourEnum.ENUM_ITEM);

Or you can get:

int index = YourEnum.valueOf("ENUM_ITEM").ordinal();

Upvotes: 15

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