利用stream的sorted()进行实现中文排序和数字排序(包括降序和升序)，非常简单。

/**
 * @Description
 * @Author wxyShine
 * @Date 2022/7/25 15:41
 * @Email wxy@wxy97.com
 */
public class Main {
static class Stu{
private Integer id;
private String name;
private String grade;
   public Stu(Integer id, String name, String grade) {
       this.id = id;
       this.name = name;
       this.grade = grade;
   }

   public Integer getId() {
       return id;
   }

   public void setId(Integer id) {
       this.id = id;
   }

   public String getName() {
       return name;
   }

   public void setName(String name) {
       this.name = name;
   }

   public String getGrade() {
       return grade;
   }

   public void setGrade(String grade) {
       this.grade = grade;
   }

   @Override
   public String toString() {
       return "Stu{" +
               "id=" + id +
               ", name='" + name + '\'' +
               ", grade='" + grade + '\'' +
               '}';
   }

}
public static void main(String[] args) {
    //测试数据，可以看到顺序是乱的。
    List<Stu> user = new ArrayList<>();
    user.add( new Stu(1, "安静","yi"));
    user.add( new Stu(4, "李四","er"));
    user.add( new Stu(2, "王五","san"));
    user.add( new Stu(3, "赵六","si"));

    //按编号升序(默认)
    List<Stu> collect = user.stream().sorted(Comparator.comparingInt(Stu::getId)).collect(Collectors.toList());
    //遍历输出
    System.out.println("数字升序");
    collect.forEach(System.out::println);
    System.out.println("===========================================================================");

    //按姓名升序(默认)
    List<Stu> collect1 = user.stream()
            .sorted((s1, s2) -> Collator.getInstance(Locale.SIMPLIFIED_CHINESE).compare(s1.getName(),s2.getName())).collect(Collectors.toList());
    //遍历输出
    System.out.println("中文升序");
    collect1.forEach(System.out::println);
    System.out.println("===========================================================================");

    //按年级升序(默认)
    List<Stu> collect2 = user.stream()
            .sorted((s1, s2) -> Collator.getInstance(Locale.SIMPLIFIED_CHINESE).compare(s1.getGrade(),s2.getGrade())).collect(Collectors.toList());
    //遍历输出
    System.out.println("拼音升序");
    collect2.forEach(System.out::println);
    System.out.println("===========================================================================");


    //按编号降序
    List<Stu> collect3 = user.stream().sorted((o1, o2) -> o2.getId() - o1.getId()).collect(Collectors.toList());
    //遍历输出
    System.out.println("数字降序");
    collect3.forEach(System.out::println);
    System.out.println("===========================================================================");

    //按姓名降序
    List<Stu> collect4 =
            user.stream().sorted((s1, s2) -> Collator.getInstance(Locale.SIMPLIFIED_CHINESE).compare(s2.getName(),s1.getName())).collect(Collectors.toList());
    //遍历输出
    System.out.println("中文降序");
    collect4.forEach(System.out::println);

    //按年级降序
    List<Stu> collect5 =
            user.stream().sorted((s1, s2) -> Collator.getInstance(Locale.SIMPLIFIED_CHINESE).compare(s2.getGrade(),s1.getGrade())).collect(Collectors.toList());
    //遍历输出
    System.out.println("拼音降序");
    collect5.forEach(System.out::println);

}

执行结果

数字升序
Stu{id=1, name='安静', grade='yi'}
Stu{id=2, name='王五', grade='san'}
Stu{id=3, name='赵六', grade='si'}
Stu{id=4, name='李四', grade='er'}
===========================================================================
中文升序
Stu{id=1, name='安静', grade='yi'}
Stu{id=4, name='李四', grade='er'}
Stu{id=2, name='王五', grade='san'}
Stu{id=3, name='赵六', grade='si'}
===========================================================================
拼音升序
Stu{id=4, name='李四', grade='er'}
Stu{id=2, name='王五', grade='san'}
Stu{id=3, name='赵六', grade='si'}
Stu{id=1, name='安静', grade='yi'}
===========================================================================
数字降序
Stu{id=4, name='李四', grade='er'}
Stu{id=3, name='赵六', grade='si'}
Stu{id=2, name='王五', grade='san'}
Stu{id=1, name='安静', grade='yi'}
===========================================================================
中文降序
Stu{id=3, name='赵六', grade='si'}
Stu{id=2, name='王五', grade='san'}
Stu{id=4, name='李四', grade='er'}
Stu{id=1, name='安静', grade='yi'}
拼音降序
Stu{id=1, name='安静', grade='yi'}
Stu{id=3, name='赵六', grade='si'}
Stu{id=2, name='王五', grade='san'}
Stu{id=4, name='李四', grade='er'}
Process finished with exit code 0