Question

I have a Date/String TreeMap and I want to loop through the N last entries.

TreeMap<Date,String> map = new TreeMap<Date,String>();
map.put(new Date(2011,1,1), "32,1");
map.put(new Date(2011,3,1), "35");
map.put(new Date(2011,4,5), "38,9");
map.put(new Date(2011,8,2), "57!!");

Then I’m lost. I’ve found this :

NavigableSet<Date> dates = donnees.descendingKeySet();

Then I don’t know how to say something like :

for(key in dates and i ; i from 0 to N)
{ do something }

Any help ?

Answer 1

int i=0;
for(Iterator<Date> it = dates.iterator(); it.hasNext() && i<3;) {
  Date date = it.next();
  doSomething();
  i++
}

Or (equivalent):

int i=0;
Iterator<Date> it = dates.iterator();
while(i<3 && it.hasNext()) {
  Date date = it.next();
  doSomething();
  i++
}