需求：

对如下List中的数据进行排序，先按照finishLessonCount进行排序，如果finishLessonCount相同，则按照姓名进行排序

如下是List中的对象实体

@Data
public class TeacherLessonStatistics {
    private int teacherId;
    private String name;
    private int finishLessonCount;
    private int totalScore;
    private int ranking;
    private boolean isClassAdmin;
}

单纯性的对数字，或者英文进行排序比较方便，Collections的sort方法可以进行排序

   private List<TeacherLessonStatistics> sortListData(List<TeacherLessonStatistics> statisticsList) {
        Collections.sort(statisticsList, (o1, o2) -> {
            if (o2.getFinishLessonCount() > o1.getFinishLessonCount()) {
                return 1;
            }
            if (o2.getFinishLessonCount() == o1.getFinishLessonCount()) {
                return o2.getName().compareTo(o1.getName()); //适用于英文，英文排序默认根据英文ASCII码进行排序
            }
            return -1;
        });
        return statisticsList;
    }

如果要对中文字符进行排序，需要使用Collator类，先指定Collator的地点

Collator cmp = Collator.getInstance(Locale.CHINA);

再利用Collator的compare进行比较

    /**
     * 对list里面的数据进行排序，先根据完成课时数量排，课时数量相同时，根据姓拼音排序
     *
     * @param statisticsList
     * @return
     */
    private List<TeacherLessonStatistics> sortListData(List<TeacherLessonStatistics> statisticsList) {

        Collections.sort(statisticsList, new Comparator<TeacherLessonStatistics>() {
            Collator cmp = Collator.getInstance(Locale.CHINA);
            @Override
            public int compare(TeacherLessonStatistics o1, TeacherLessonStatistics o2) {
                if (o2.getFinishLessonCount() > o1.getFinishLessonCount()) return 1;
                if (o2.getFinishLessonCount() == o1.getFinishLessonCount()){
                    CollationKey c1 = cmp.getCollationKey(o1.getName());
                    CollationKey c2 = cmp.getCollationKey(o2.getName());
                    return cmp.compare(c1.getSourceString(), c2.getSourceString());
                }
                return -1;
            }
        });
        return statisticsList;
    }