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

class ShuffleString
{

    public static String shuffle(String s)
    {

        String shuffledString = ""; 

        while (s.length() != 0)
        {
            int index = (int) Math.floor(Math.random() * s.length());
            char c = s.charAt(index);
            s = s.substring(0,index)+s.substring(index+1);
            shuffledString += c;
        }

        return shuffledString;

    }

}


public class foo{
    static public void main(String[] args)
    {

        String test = "hallo";
        test = ShuffleString.shuffle(test);
        System.out.println(test);
    }
}

Output: ahlol