Java中給List 對象集合去重

  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());}