Question

I have a list with some beans and those beans are sorted maps. I want to iterate over maps and get the values and put them in a treeset.

 List<ItemBean> plannedBeans

This is what inside of “plannedBeans”

public int getItemNumber() { return unitNumber; }
public SortedMap<Date, Sequencing> getPlannedByMonth() { return sequencing; }

This is what is inside of the map

public Date getMonth() { return month; }
public double getPlanned() { return plan; }

I want to get all the month’s in the sorted maps and throw them in one treeset.

Answer 1

Once your map is ready, just iterate over it and populate the TreeSet with the keys.

SortedMap<Date, Sequencing> map;

TreeSet<Date> set = new TreeSet();

for(Entry<Date, Sequencing> en: map.entrySet()) {
   set.add(en.getKey())
}