Question

Before I post this question, I found somehow similar question posted here. But the answer was based on a String. However, I have a different situation here. I am not trying to remove String but another object called AwardYearSource. This class has an int attribute called year. So I want to remove duplicates based on the year. i.e if there is year 2010 mentioned more than once, I want to remove that AwardYearSource object. How can I do that?

Answer 1

The simplest way to remove elements based on a field is as follows (preserving order):

Map<Integer, AwardYearSource> map = new LinkedHashMap<>();
for (AwardYearSource ays : list) {
  map.put(ays.getYear(), ays);
}
list.clear();
list.addAll(map.values());