Get index of enum from string?

Question

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;
   }
   ...
}

Pshemo · Accepted Answer · 2023-02-23 11:12:45Z

130

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();

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

edited Feb 23, 2023 at 11:12

answered Mar 15, 2013 at 15:56

Pshemo

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1 Comment

Paul Over a year ago

Thanks for all the answers guys, these all work, apparently that was not my problem. The problem was that if I search the library, for say 9600 in the string array, it works fine. But when I was searching for the same value in the enum it said it was not a value in the enum. 03-15 16:04:19.925: E/AndroidRuntime(19719): Caused by: java.lang.IllegalArgumentException: 19200 is not a constant in slickdevlabs.apps.usb2seriallib.SlickUSB2Serial$BaudRate, so i will just use the string array... No idea why this is the case. Luckily the library gave a string array also.

Alban Dericbourg · Accepted Answer · 2013-03-15 15:57:48Z

15

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();

answered Mar 15, 2013 at 15:57

Alban Dericbourg

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Comments

Aurasphere · Accepted Answer · 2017-06-20 13:18:46Z

7

Try this simple solution:

Fruit.values()[index]

edited Jun 20, 2017 at 13:18

Aurasphere

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answered Jun 20, 2017 at 11:43

Sathishkumar J

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Comments

Divya Motiwala · Accepted Answer · 2013-03-15 16:02:28Z

2

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());
    }

answered Mar 15, 2013 at 16:02

Divya Motiwala

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Comments

Gowtham Sooryaraj · Accepted Answer · 2023-03-21 10:49:12Z

1

It's really simple

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

enum TestEnum{
  c,d
}

answered Mar 21, 2023 at 10:49

Gowtham Sooryaraj

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Comments

anshul6297 · Accepted Answer · 2017-06-16 06:14:12Z

0

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();

answered Jun 16, 2017 at 6:14

anshul6297

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Comments

Nidhin Mahesh A · Accepted Answer · 2022-10-18 11:50:30Z

0

Adding here the solution that worked for me:

YourEnum.values.indexOf("VALUE");

answered Oct 18, 2022 at 11:50

Nidhin Mahesh A

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