Java中给List＜T＞ 对象集合去重

Java中给List 对象集合去重

  List<Student> getStudentList = studentMapper.getStudentList();
           List<Student> distinctInsurance = distinctByField(getStudentList, Student::getCertNo);

    public static <T> List<T> distinctByField(List<T> list, Function<T, Object> fieldExtractor) {
        Set<Object> seen = new HashSet<>();
        return list.stream()
                .filter(item -> seen.add(fieldExtractor.apply(item)))
                .collect(Collectors.toList());
    }