TreeSet<Integer> set = new TreeSet<Integer>();
TreeSet<Integer> subSet = new TreeSet<Integer>();
for(int i=606;i<613;i++){
    if(i%2==0){
     set.add(i);
     }
 }
subSet = (TreeSet)set.subSet(608,true,611,true);
set.add(609);
System.out.println(set+" "+subSet);