总成绩的集合排序

实体类

public class Student {
    private String name;//姓名
    private Integer che;//语文成绩
    private Integer ma;//数学成绩
    private Integer eng;//英语成绩

    public Student() {
    }

    public Student(String name, Integer che, Integer ma, Integer eng) {
        this.name = name;
        this.che = che;
        this.ma = ma;
        this.eng = eng;
    }

    public String getName() {
        return name;
    }

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

    public Integer getChe() {
        return che;
    }

    public void setChe(Integer che) {
        this.che = che;
    }

    public Integer getMa() {
        return ma;
    }

    public void setMa(Integer ma) {
        this.ma = ma;
    }

    public Integer getEng() {
        return eng;
    }

    public void setEng(Integer eng) {
        this.eng = eng;
    }

    /**
     * 这里计算总分
     * @return 总分
     */
    public Integer getSum(){
        return che+ma+eng;
    }
}

排序类

public class StudentComparator implements Comparator<Student> {
    @Override
    public int compare(Student s1, Student s2) {
        if(s1.getSum()<s2.getSum()){
            return 1;
        }else if (s1.getSum()>s2.getSum()){
            return -1;
        }else {
            return 0;
        }
    }
}

测试类

public class StudentTest {
    public static void main(String[] args) {
        TreeSet<Student> t=new TreeSet<>(new StudentComparator());//这里就没有用键盘输入了
        Student s1=new Student("张三",1,2,3);
        Student s2=new Student("李四",7,8,9);
        Student s3=new Student("王五",4,5,6);
        t.add(s1);
        t.add(s2);
        t.add(s3);
        for (Student s:t){//遍历
            System.out.println("姓名："+s.getName()+"  ,总分："+s.getSum());
        }
    }
}

输入结果