Java – how to reverse the order of sortedsets

I want to print a sequential table in the map using the following:

Map<Float,String> mylist = new HashMap<>();

mylist.put(10.5,a);
mylist.put(12.3,b);
mylist.put(5.1,c);

SortedSet<Float> orderlist = new TreeSet<Float>(mylist.keySet());

for (Float i : orderlist) {
    System.out.println(i+" "+mylist.get(i));
}

Print the above code:

5.1 c
10.5 a
12.3 b

However, how to print the order list in reverse order is as follows:

12.3 b
10.5 a
5.1 c

Solution

If you want to store elements in sortedset in reverse order, the only change you need to make is to build a TreeSet using an appropriate constructor, which uses a custom comparator:

Map<Float,c);

SortedSet<Float> orderlist = new TreeSet<Float>(Collections.reverSEOrder());
orderList.addAll(mylist.keySet());

for (Float i : orderlist) {
    System.out.println(i+" "+mylist.get(i));
}

Note that the neat method here is collections Reverseorder(), which returns a comparator, which is the opposite of the natural order of the elements