java map string to list
Map<String, List<String>> myMaps = new HashMap<String, List<String>>();
for (DataObject item : myList) {
if (!myMaps.containsKey(item.getKey())) {
myMaps.put(item.getKey(), new ArrayList<String>());
}
myMaps.get(item.getKey()).add(item.getValue());
}list to map of list java 8
Map<String,Set<String>> map = list.stream().
collect(Collectors.groupingBy(
Student::getName,
Collectors.mapping(e->getNum(e.getAddr()), Collectors.toSet())
));
System.out.println("Map : "+map);Copyright © 2021 Codeinu
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