public class StreamListTest {
    public static void main(String[] args) {
　　　　
        List<Student> studentList = new ArrayList<>();
        studentList.add(new Student("1","zhangsan"));
        studentList.add(new Student("1","zhangsan"));
        studentList.add(new Student("1","趙六"));
        studentList.add(new Student("2","wangwu"));
        studentList.add(new Student("3","超仔"));

        List<Student> collect = studentList.stream().distinct().collect(Collectors.toList());
        collect.forEach(System.out::println);

        System.out.println("-----------------------以下是根據物件中的某個屬性進行去重");
        List<Student> students = studentList.stream().collect(
                Collectors.collectingAndThen(Collectors.toCollection(() -> new TreeSet<>(
                        Comparator.comparing(Student::getStuNo))),ArrayList::new));

        students.forEach(System.out::println);

    }
}

輸出結果：

Student(stuNo=1, name=zhangsan)
Student(stuNo=1, name=趙六)
Student(stuNo=2, name=wangwu)
Student(stuNo=3, name=超仔)
-----------------------以下是根據物件中的某個屬性進行去重
Student(stuNo=1, name=zhangsan)
Student(stuNo=2, name=wangwu)
Student(stuNo=3, name=超仔)

 這裡可以看到完美根據學生的stuNo去重，如果只是使用distinct（）方法去重的只是相同的元素，第二種方法根據某個屬性來去重，完美達成。

實體類

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Student {
    private String stuNo;
    private String name;
}