TreeSet- how to allow duplicate keys entries

I was doing a question in codechef and I do programming in Java. I need to know if there is any way we can store duplicate keys in TreeSet.

ya certainaly there is a way .for u to store the duplicated key just by enrolling the pre processor of the root directory and by enrolling the root directory to the main directory .

sry but I didn’t get it. :frowning: