1.编写学生类Student，包含学号、姓名和成绩三个成员变量，设计成绩比较器，实现Comparator接口。编写测试类，使用Arrays类的带两个参数的sort方法对一组学生按成绩降序排序。(提示:随机产生100个学生对象)

下面是代码实现：

import java.util.Arrays;
import java.util.Comparator;
import java.util.Random;

public class Student {
    private int id;
    private String name;
    private int score;

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

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

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

    public int getScore() {
        return score;
    }

    public void setScore(int score) {
        this.score = score;
    }

    @Override
    public String toString() {
        return "Student [id=" + id + ", name=" + name + ", score=" + score + "]";
    }
}

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

class Test {
    public static void main(String[] args) {
        Student[] students = new Student[100];
        Random random = new Random();
        for (int i = 0; i < students.length; i++) {
            students[i] = new Student(i + 1, "Student" + (i + 1), random.nextInt(101));
        }
        System.out.println("排序前:");
        for (Student student : students) {
            System.out.println(student);
        }
        Arrays.sort(students, new ScoreComparator());
        System.out.println("排序后:");
        for (Student student : students) {
            System.out.println(student);
        }
    }
}

运行结果：

排序前:
Student [id=1, name=Student1, score=96]
Student [id=2, name=Student2, score=29]
Student [id=3, name=Student3, score=9]
Student [id=4, name=Student4, score=15]
Student [id=5, name=Student5, score=63]
...
排序后:
Student [id=38, name=Student38, score=100]
Student [id=15, name=Student15, score=99]
Student [id=46, name=Student46, score=98]
Student [id=71, name=Student71, score=98]
Student [id=35, name=Student35, score=97]
...