java1.8 根據list內某個字段值，條件去重后獲取新的list

List<Student> list = new ArrayList<>();
        list.add(new Student(1, "小紅", "重慶"));
        list.add(new Student(2, "小綠", "北京"));
        list.add(new Student(3, "小粉", "廣州"));
        list.add(new Student(4, "小紅", ""));
        list.add(new Student(5, "小紅", "重慶"));

        List<Student> newList = list.stream()
                .filter(student -> StringUtils.isNotBlank(student.getCity()))
                .collect(Collectors.collectingAndThen(Collectors.toCollection(
                        () -> new TreeSet<>(Comparator.comparing(Student::getName))), ArrayList::new));

        newList.forEach(student -> {
            System.out.println(student);
        });

運行結果：

Student(id=3, name=小粉, city=廣州)
Student(id=1, name=小紅, city=重慶)
Student(id=2, name=小綠, city=北京)

 

@Data
public class Student {
    private Integer id;
    private String name;
    private String city;

    public Student(Integer id, String name, String city) {
        this.id = id;
        this.name = name;
        this.city = city;
    }
}