如何实现java8 list按照元素的某个字段去重

list 按照元素的某个字段去重

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

测试数据

List studentList = Lists.newArrayList();
studentList.add(new Student(28, "river"));
studentList.add(new Student(12, "lucy"));
studentList.add(new Student(33, "frank"));
studentList.add(new Student(33, "lucy"));

java8 通过tree set 去重

List studentDistinctList = studentList.stream()
.collect(Collectors.collectingAndThen
(Collectors.toCollection(() ->
new TreeSet<>(Comparator.comparing(t -> t.getName()))),
ArrayList::new
)
);
System.out.println(new Gson().toJson(studentDistinctList));

扩展distinct 方法去重

List studentDistinct2List = studentList.stream().filter(StreamUtil.distinctByKey(t->t.getName()))
.collect(Collectors.toList());
System.out.println(new Gson().toJson(studentDistinct2List));

工具类

public class StreamUtil {

public static  Predicate distinctByKey(Function keyExtractor) {
Set