can StringBuffer objects be keys in TreeSet in Java?

Question

I have the following code where I am trying to put the StringBuffer objects as keys in a TreeSet. The reason I do this is to see if I can put mutable objects as keys. I do n

Answer 1

just add a comparator class and then use it in your TreeSet as follows:

class Comparatorbuff implements Comparator {

        @Override
        public int compare(StringBuffer s1, StringBuffer s2) {
            return s1.toString().compareTo(s2.toString());

        }

}

in your main method: modify as follows
Set sb=new TreeSet(new Comparatorbuff());