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Dori
Dori

Reputation: 18403

Best way to create enum of strings?

What is the best way to have a enum type represent a set of strings?

I tried this:

enum Strings{
   STRING_ONE("ONE"), STRING_TWO("TWO")
}

How can I then use them as Strings?

Upvotes: 428

Views: 647503

Answers (8)

Pravin Bansal
Pravin Bansal

Reputation: 4681

Get and set with default values.

public enum Status {
  STATUS_A("Status A"), STATUS_B("Status B");

  private String status;

  Status(String status) {
    this.status = status;
  }

  public String getStatus() {
    return status;
  }
}

Upvotes: 3

Buhake Sindi
Buhake Sindi

Reputation: 89169

I don't know what you want to do, but this is how I actually translated your example code....

package test;

/**
 * @author The Elite Gentleman
 *
 */
public enum Strings {
    STRING_ONE("ONE"),
    STRING_TWO("TWO")
    ;

    private final String text;

    /**
     * @param text
     */
    Strings(final String text) {
        this.text = text;
    }

    /* (non-Javadoc)
     * @see java.lang.Enum#toString()
     */
    @Override
    public String toString() {
        return text;
    }
}

Alternatively, you can create a getter method for text.

You can now do Strings.STRING_ONE.toString();

Upvotes: 716

Shohel Rana
Shohel Rana

Reputation: 2342

You can use that for string Enum

public enum EnumTest {
    NAME_ONE("Name 1"),
    NAME_TWO("Name 2");

    private final String name;

    /**
     * @param name
     */
    private EnumTest(final String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }
}

And call from main method

public class Test {
    public static void main (String args[]){
        System.out.println(EnumTest.NAME_ONE.getName());
        System.out.println(EnumTest.NAME_TWO.getName());
    }
}

Upvotes: 14

Adrian Smith
Adrian Smith

Reputation: 17553

Either set the enum name to be the same as the string you want or, more generally,you can associate arbitrary attributes with your enum values:

enum Strings {
   STRING_ONE("ONE"), STRING_TWO("TWO");
   private final String stringValue;
   Strings(final String s) { stringValue = s; }
   public String toString() { return stringValue; }
   // further methods, attributes, etc.
}

It's important to have the constants at the top, and the methods/attributes at the bottom.

Upvotes: 22

Adam111p
Adam111p

Reputation: 3717

If you do not want to use constructors, and you want to have a special name for the method, try it this:

public enum MyType {
  ONE {
      public String getDescription() {
          return "this is one";
      }
  },    
  TWO {
      public String getDescription() {
          return "this is two";
      }
  };

  public abstract String getDescription();
}

I suspect that this is the quickest solution. There is no need to use variables final.

Upvotes: 9

vaichidrewar
vaichidrewar

Reputation: 9621

Custom String Values for Enum

from http://javahowto.blogspot.com/2006/10/custom-string-values-for-enum.html

The default string value for java enum is its face value, or the element name. However, you can customize the string value by overriding toString() method. For example,

public enum MyType {
  ONE {
      public String toString() {
          return "this is one";
      }
  },

  TWO {
      public String toString() {
          return "this is two";
      }
  }
}

Running the following test code will produce this:

public class EnumTest {
  public static void main(String[] args) {
      System.out.println(MyType.ONE);
      System.out.println(MyType.TWO);
  }
}


this is one
this is two

Upvotes: 124

hd42
hd42

Reputation: 1771

Depending on what you mean by "use them as Strings", you might not want to use an enum here. In most cases, the solution proposed by The Elite Gentleman will allow you to use them through their toString-methods, e.g. in System.out.println(STRING_ONE) or String s = "Hello "+STRING_TWO, but when you really need Strings (e.g. STRING_ONE.toLowerCase()), you might prefer defining them as constants:

public interface Strings{
  public static final String STRING_ONE = "ONE";
  public static final String STRING_TWO = "TWO";      
}

Upvotes: 21

Bart Kiers
Bart Kiers

Reputation: 170148

Use its name() method:

public class Main {
    public static void main(String[] args) throws Exception {
        System.out.println(Strings.ONE.name());
    }
}

enum Strings {
    ONE, TWO, THREE
}

yields ONE.

Upvotes: 78

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