list to map of list java 8

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showing results for - "list to map of list java 8"

1   Map<String,Set<String>> map =  list.stream().
2           collect(Collectors.groupingBy(
3                    Student::getName,
4                    Collectors.mapping(e->getNum(e.getAddr()), Collectors.toSet())
5                ));
6
7   System.out.println("Map : "+map);
8

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