import java.util.Arrays;

class Student implements Comparable<Student>{
    public String name;
    public int age;

    public Student(String name, int age) {
        this.name = name;
        this.age = age;
    }

    @Override
    public String toString() {
        return this.name + " " + this.age;
    }

    @Override
    public int compareTo(Student o) {
        //return this.name.compareTo(o.name); //以姓名进行排序
        return o.age-this.age;
        //一般 o 在前是降序，this是升序


       /* if (this.age>o.age) {
            return 1;
        }else if (this.age==o.age) {
            return 0;
        } else {
            return -1;
        }*/
    }
}
public class TestComparable {
    public static void main(String[] args) {
        Student[] students = new Student[3];
        students[0] = new Student("gb",28);
        students[1] = new Student("bit",18);
        students[2] = new Student("ang",98);
        System.out.println("排序前："+Arrays.toString(students));
        Arrays.sort(students);
        System.out.println("排序后："+Arrays.toString(students));

        //Comparable<Student> comparable=new Student("gb",38);//Student实现这个接口发生了向上转型
    }
}