设计一个学生类CStudent，其数据成员是学生的学号、姓名、数学、外语、计算机课程成绩。 建立学生对象的数组并输入相关信息，打印所有学生信息。 查找出学号为n的学生的信息。 学生类增加一个成员方法：求平均分 测试类中将学生按照平均分排序输出用java实现

好的，以下是实现代码：

import java.util.Arrays;
import java.util.Scanner;

class CStudent {
    private String id; // 学号
    private String name; // 姓名
    private double mathScore; // 数学成绩
    private double englishScore; // 外语成绩
    private double computerScore; // 计算机成绩

    public CStudent(String id, String name, double mathScore, double englishScore, double computerScore) {
        this.id = id;
        this.name = name;
        this.mathScore = mathScore;
        this.englishScore = englishScore;
        this.computerScore = computerScore;
    }

    public String getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public double getMathScore() {
        return mathScore;
    }

    public double getEnglishScore() {
        return englishScore;
    }

    public double getComputerScore() {
        return computerScore;
    }

    public double getAvgScore() {
        return (mathScore + englishScore + computerScore) / 3.0;
    }

    @Override
    public String toString() {
        return "学号：" + id + "，姓名：" + name + "，数学成绩：" + mathScore +
                "，外语成绩：" + englishScore + "，计算机成绩：" + computerScore;
    }
}

public class Test {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        // 输入学生个数
        System.out.print("请输入学生个数：");
        int n = scanner.nextInt();

        // 创建学生对象数组
        CStudent[] students = new CStudent[n];

        // 输入学生信息
        for (int i = 0; i < n; i++) {
            System.out.println("请输入第" + (i + 1) + "个学生的信息：");
            System.out.print("学号：");
            String id = scanner.next();
            System.out.print("姓名：");
            String name = scanner.next();
            System.out.print("数学成绩：");
            double mathScore = scanner.nextDouble();
            System.out.print("外语成绩：");
            double englishScore = scanner.nextDouble();
            System.out.print("计算机成绩：");
            double computerScore = scanner.nextDouble();

            students[i] = new CStudent(id, name, mathScore, englishScore, computerScore);
        }

        // 打印学生信息
        System.out.println("所有学生信息：");
        for (CStudent student : students) {
            System.out.println(student);
        }

        // 查找学号为n的学生信息
        System.out.print("请输入要查找的学号：");
        String targetId = scanner.next();
        for (CStudent student : students) {
            if (student.getId().equals(targetId)) {
                System.out.println("找到了该学生，信息如下：");
                System.out.println(student);
            }
        }

        // 按照平均分排序并输出
        Arrays.sort(students, (s1, s2) -> Double.compare(s2.getAvgScore(), s1.getAvgScore()));
        System.out.println("按照平均分排序后的学生信息：");
        for (CStudent student : students) {
            System.out.println(student);
        }
    }
}

希望我的回答能够帮助到你！