Question

Is there a way to generate a unique surrogate string like UUID.randomUUID() but containing characters only (means no numbers)? The string is stored in multiple databases on different hosts and has to be system wide unique (even if I generate two keys at the same time – i.e. by threads).

Answer 1

Just wrote this – random string of upper case characters:

package dan;

import java.util.Random;

public class RandText {

    /**
     * @param args
     */
    public static void main(String[] args) {

        String s = getRandomText(100);
        System.out.println(s);

    }


    public static String getRandomText(int len) {
        StringBuilder b = new StringBuilder();
        Random r = new Random();
        for (int i = 0; i<len;i++) {
            char c = (char)(65+r.nextInt(25));
            b.append(c);
        }
        return b.toString();
    }
}