How to iterate through a Java enum?

Question

I have an enum of string, as in this example.

When my current element would be STRING_ONE, how can switch to the next Strings item in the enum with for instance the ++ operator?

Something like:

 Strings myEnum = String.STRING_ONE;
    myEnum++ ; // to have STRING_TWO for instance

?

EDIT: I do not want to iterate through all of those enum elements. These STRING_ONE, STRING_TWO etc are some sort of states. I want to implement a getNextState() Method like

private void getNextstate(){
   myCurrentstate++;
}

Now, I have this, which does not seem efficient

private void getNextstate(){
   if(myCurrentstate == Strings.STRING_ONE) myCurrentstate == Strings.STRING_TWO;
   else if(myCurrentstate == Strings.STRING_TWO) myCurrentstate == Strings.STRING_THREE;
   //..
   else if(myCurrentstate == Strings.STRING_NINTYNINE) myCurrentstate == Strings.STRING_HUNDRET;
}

`x = Strings.values()[x.ordinal()+1]` – khelwood Feb 25 '16 at 15:01 — khelwood, Feb 25 '16 at 15:01

ΦXocę 웃 Пepeúpa ツ · Answer 1 · 2016-02-25T15:10:48.597

2

In java, you can not overload the + operator, but you can for sure do:

   public enum Strings {
    STRING_ONE("ONE"),
    STRING_TWO("TWO")
    ;

    private final String text;

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

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

and then

for (Strings dir : Strings.values()) {
  // your code here
  System.out.println(dir.toString());
}

edited Feb 25 '16 at 15:10

answered Feb 25 '16 at 15:04

ΦXocę 웃 Пepeúpa ツ

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1

Your inclusion of a `text` property and toString override has nothing to do with the question, and only serves to make your answer much longer than it needs to be. – VGR Feb 25 '16 at 15:32
Read the question again, and go to the link, the CO is referring to please. – ΦXocę 웃 Пepeúpa ツ Feb 25 '16 at 15:46

score 0 · Answer 2 · answered Feb 25 '16 at 15:04

0

You could use

for (Strings string : Strings.values()) {
    System.out.println(string);
}

answered Feb 25 '16 at 15:04

Solorad

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How to iterate through a Java enum?

2 Answers2