为什么Collectors.Partitioningby返回对象而不是映射[重复]

Question

Predicate<Employee> addressSectionNull = emp-> emp== null || emp.getAddress() == null;
Predicate<Employee> isBlankLane = emp -> StringUtils.isBlank(emp.getAddress().getLane());
Predicate<Employee> notValidCity = emp -> "NA".equalsIgnoreCase(emp.getAddress().getCity());


Predicate notEligible =
    addressSectionNull.or(isBlankLane).or(notValidCity);
Map<Boolean, List<Employee>> empValidityMap =
    employees.parallelStream().collect(Collectors.partitioningBy(notEligible));

Answer 1

改变

Predicate notEligible = ...

到

Predicate<Employee> notEligible = ...

原因:collectors.PartitioningBy(T谓词）将返回收集器 > 。当谓词没有泛型类型时，T将是object。