1. public class Drink implements Comparable {2. public String name;3. public int compareTo(Object o) {4. return 0;5. }6. }and:7. Drink one = new Drink();8. Drink two = new Drink();9. one.name= "Coffee";10. two.name= "Tea";11. TreeSet set = new TreeSet();12. set.add(one);13. set.add(two);