1、定义一个实体类Student,因为主要关注排序，所以实体类略显简单。
2、添加几条数据，为后续实验做准备
3、定义两个排序对象，先按chinese由低到高排序，chinese相同，则english由低到高排序。
4、按chinese由低到高排序，chinese相同，则英语由高到低排序。（即调用排序对象的reversed（）方法）
5、按chinese由高到低排序，chinese相同，则english由高到低排序。
6、全部代码：import java.util.ArrayList;import java.util.Collections;import java.util.Comparator;import java.util.List;class Student { //学号 private String sno; //语文分数 private float chinese; //英语分数 private float english; public Student(String sno, float chinese, float english) { super(); this.sno = sno; this.chinese = chinese; this.english = english; } public String getSno() { return sno; } public float getChinese() { return chinese; } public void setChinese(float chinese) { this.chinese = chinese; } public float getEnglish() { return english; } public void setEnglish(float english) { this.english = english; }}public class Main { public static void main(String[] args) { List<Student> students = new ArrayList<Student>(); students.add(new Student("01", 63.0f, 75f)); students.add(new Student("02", 65.0f, 72f)); students.add(new Student("03", 63.0f, 82f)); students.add(new Student("04", 72.0f, 72f)); students.add(new Student("05", 63.0f, 65f)); Comparator<Student> compareChinese = Comparator.comparing(Student::getChinese); Comparator<Student> compareEnglish = Comparator.comparing(Student::getEnglish); Collections.sort(students, compareChinese.thenComparing(compareEnglish)); for (Student s : students) { System.out.println(s.getSno() + "," + s.getChinese() + "," + s.getEnglish()); } System.out.println("---------------------------------------"); Collections.sort(students, compareChinese.thenComparing(compareEnglish.reversed())); for (Student s : students) { System.out.println(s.getSno() + "," + s.getChinese() + "," + s.getEnglish()); } System.out.println("---------------------------------------"); Collections.sort(students, compareChinese.reversed(). thenComparing(compareEnglish.reversed())); for (Student s : students) { System.out.println(s.getSno() + "," + s.getChinese() + "," + s.getEnglish()); } }}