对象列表按某一个字段排序

import com.google.common.collect.Lists;
import java.util.Comparator;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;

public class OrderTest {
    public static class User{
        private Long id;
        private String name;
        public Long getId() {
            return id;
        }
        public void setId(Long id) {
            this.id = id;
        }
        public String getName() {
            return name;
        }
        public void setName(String name) {
            this.name = name;
        }
        @Override
        public String toString() {
            return "User{" +
                    "id=" + id +
                    ", name='" + name + ''' +
                    '}';
        }
    }

    public static void main(String [] args) {
        User user1 = new User();
        user1.setId(3L);
        user1.setName("TR6");
        User user2 = new User();
        user2.setId(1L);
        user2.setName("TR5");
        List userList = Lists.newArrayList(user1, user2);
        System.out.println("排序前：" + userList);
        List orderUserList = userList.stream()
                .filter(Objects::nonNull)
                .sorted(Comparator.comparing(User::getName))
                .collect(Collectors.toList());
        System.out.println("排序后：" + orderUserList);

    }
}

// 结果

排序前：[User{id=3, name='TR6'}, User{id=1, name='TR5'}]
排序后：[User{id=1, name='TR5'}, User{id=3, name='TR6'}]