I have two HashMaps defined like so:
HashMap<String, List<Incident>> map1 = new HashMap<String, List<Incident>>();
HashMap<String, List<Incident>> map2 = new HashMap<String, List<Incident>>();
Also, I have a 3rd HashMap Object:
HashMap<String, List<Incident>> map3;
and the merge list when combine both.
In short, you can't. map3 doesn't have the correct types to merge map1 and map2 into it.
However if it was also a HashMap<String, List<Incident>>. You could use the putAll method.
map3 = new HashMap<String, List<Incident>>();
map3.putAll(map1);
map3.putAll(map2);
If you wanted to merge the lists inside the HashMap. You could instead do this.
map3 = new HashMap<String, List<Incident>>();
map3.putAll(map1);
for(String key : map2.keySet()) {
List<Incident> list2 = map2.get(key);
List<Incident> list3 = map3.get(key);
if(list3 != null) {
list3.addAll(list2);
} else {
map3.put(key,list2);
}
}
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