Java案例使用比较排序器comparator实现成绩排序

public class Student {
    //成员变量
    private String  name;
    private int YWscore;
    private int YYscore;
​
    //构造方法
    public Student(){}
​
    public Student(String name, int YWscore, int YYscore) {
        this.name = name;
        this.YWscore = YWscore;
        this.YYscore = YYscore;
    }
    //get/set方法
​
    public String getName() {
        return name;
    }
​
    public void setName(String name) {
        this.name = name;
    }
​
    public int getYWscore() {
        return YWscore;
    }
​
    public void setYWscore(int YWscore) {
        this.YWscore = YWscore;
    }
​
    public int getYYscore() {
        return YYscore;
    }
​
    public void setYYscore(int YYscore) {
        this.YYscore = YYscore;
    }
    //定义求总成绩方法
    public int getSum(){
        int sum=YWscore+YYscore;
        return sum;
    }
}
​

public class StudentDemo {
    public static void main(String[] args) {
        //创建TreeSet集合对象
        TreeSet<Student>ts=new TreeSet<Student>(new Comparator<Student>() {
            @Override
            public int compare(Student s1, Student s2) {
//                return 0;
                int num=s2.getSum()-s1.getSum();//要从高到底排序
                int num1= num==0?s1.getYWscore()-s2.getYWscore():num;//当总分相同时按照语文成绩排序
                int num2= num1==0?s1.getName().compareTo(s2.getName()):num1;
                return num2;
            }
        });
        //创建学生对象
        Student s1=new Student("张三",56,66);
        Student s2=new Student("张四",70,69);
        Student s3=new Student("张五",80,76);
        Student s4=new Student("张六",66,96);
        Student s5=new Student("张七",66,96);
        ts.add(s5);
        ts.add(s1);
        ts.add(s2);
        ts.add(s3);
        ts.add(s4);
        //遍历
        for (Student ss:ts){
            System.out.println(ss.getName()+","+ss.getYWscore()+","+ss.getYYscore()+","+ss.getSum());
        }
    }
}