How to shuffle characters in a string without using Collections.shuffle(…)?

Question

How do I shuffle the characters in a string (e.g. hello could be ehlol or lleoh or ...). I don\'t want to use the Collections.shuffle(...) method, is there anyt

Answer 1

What an annoying problem. I finally ended up with this:

import java.util.Collections;
import com.google.common.primitives.Chars;
import org.apache.commons.lang3.StringUtils;

String shuffle(String s) {
    List chars = Chars.asList(s.toCharArray());
    Collections.shuffle(chars);
    return StringUtils.join(chars.stream().toArray());
}

Yes, two libraries :)