如何将Map转换为用户对象列表？

Question

I have a HashMap with the following structure:

Map<Object, List<OtherObject>>

And I want to convert it to:

List<FinalObject>

being FinalObject:

public class FinalObject {
    private Object object;
    private List<OtherObject> otherObject;
}

Answer 1

Assuming you have a constructor like:

public FinalObject(Object obj, List<OtherObject> list) {
    this.object = obj;
    this.otherObject = list;
}

then you can do:

List<FinalObject> newList = map.entrySet()
                               .stream().map(e -> new FinalObject(e.getKey(), e.getValue()))
                               .collect(Collectors.toList());   

Answer 2

A corresponding forEach approach would be:

List<FinalObject> finalList = new ArrayList<>();
map.forEach((k,v) -> finalList.add(new FinalObject(k, v)));