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<User> userList = Lists.newArrayList(user1, user2); System.out.println("排序前:" + userList); List<User> 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'}]