Java Converting from String to Enum

Question

I'm pretty new to Java and am not sure how to approach this problem. I have a string which can contain Enums but in String version. For example:

String str = "Hello Color.RED what's up?"

how do I convert Color.RED to an enum in the string above?

Do you want it to say Hello Color.RED or just Hello RED? Also is Color a personal enum, or does it come from java.awt? — firsttry
– firsttry, Commented May 11, 2021 at 18:20
I kind of want it to generate a new string which should be something like this "Hello" + Color.RED + "what's up" — Just Another Coder
– Just Another Coder, Commented May 11, 2021 at 18:38
To clarify a previous comment, Is Color your enum? Because java.awt.Color is a class not an enum. — WJS
– WJS, Commented May 11, 2021 at 21:26
@WJS no Color is just an example, my actual Enum is ChatColor — Just Another Coder
– Just Another Coder, Commented May 12, 2021 at 5:42

Andreas · Accepted Answer · 2021-05-11 18:28:30Z

2

You find the text RED, e.g. using a regex, then you call Color.valueOf(name).

Pattern p = Pattern.compile("\\bColor\\.([A-Za-z][A-Za-z0-9_]*)\\b");
Matcher m = p.matcher(str);
if (m.find()) {
    String name = m.group(1);
    Color color = Color.valueOf(name);
    System.out.println(color);
}

answered May 11, 2021 at 18:28

Andreas

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1 Comment

Just Another Coder Over a year ago

not what I was expecting but works well, thanks

WJS · Accepted Answer · 2021-05-12 12:36:05Z

0

Another alternative, is to use String.replaceAll to isolate the color within the string. This removes everything except the color. The \\S+ says one or more non space characters. So it could be anything, including something like @#I@S. You could modify that to fit the constraints of your enum.

String str = "Hello Color.RED what's up?";
    
String colr = str.replaceAll(".*\\bColor\\.(\\S+).*", "$1");
Color color = Color.valueOf(colr);
System.out.println(color);

edited May 12, 2021 at 12:36

answered May 11, 2021 at 21:04

WJS

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