用java设计一People类，包含name（String）、age（int）属性与相关设定、读取方法。 设计Student类，继承People类，属性有修习的课程分数，属性名称为chinese、english、math三科目成绩，并写出设定与读取分数的方法，以及计算三科平均分数的方法。 设计一程序，可以持续输入学生（最多十位）的分数，并可以计算个人的平均分数，各科的平均分数，以及全体的总平均。

好的，以下是代码实现：

People类：

public class People {
    private String name;
    private int age;

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

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}

Student类：

public class Student extends People {
    private double chinese;
    private double english;
    private double math;

    public Student(String name, int age, double chinese, double english, double math) {
        super(name, age);
        this.chinese = chinese;
        this.english = english;
        this.math = math;
    }

    public double getChinese() {
        return chinese;
    }

    public void setChinese(double chinese) {
        this.chinese = chinese;
    }

    public double getEnglish() {
        return english;
    }

    public void setEnglish(double english) {
        this.english = english;
    }

    public double getMath() {
        return math;
    }

    public void setMath(double math) {
        this.math = math;
    }

    public double getAverage() {
        return (chinese + english + math) / 3;
    }
}

主程序：

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        Student[] students = new Student[10];
        int count = 0;
        double chineseSum = 0;
        double englishSum = 0;
        double mathSum = 0;

        while (true) {
            System.out.print("请输入学生的姓名：");
            String name = scanner.next();
            System.out.print("请输入学生的年龄：");
            int age = scanner.nextInt();
            System.out.print("请输入学生的语文成绩：");
            double chinese = scanner.nextDouble();
            System.out.print("请输入学生的英语成绩：");
            double english = scanner.nextDouble();
            System.out.print("请输入学生的数学成绩：");
            double math = scanner.nextDouble();

            Student student = new Student(name, age, chinese, english, math);
            students[count++] = student;
            chineseSum += chinese;
            englishSum += english;
            mathSum += math;

            System.out.print("是否继续输入（Y/N）：");
            String choice = scanner.next();
            if (choice.equals("N") || count == 10) {
                break;
            }
        }

        double chineseAverage = chineseSum / count;
        double englishAverage = englishSum / count;
        double mathAverage = mathSum / count;
        double totalAverage = (chineseSum + englishSum + mathSum) / (count * 3);

        System.out.println("各科平均分数：");
        System.out.println("语文：" + chineseAverage);
        System.out.println("英语：" + englishAverage);
        System.out.println("数学：" + mathAverage);
        System.out.println("全体总平均分数：" + totalAverage);

        for (int i = 0; i < count; i++) {
            System.out.println("学生" + (i + 1) + "：" + students[i].getName());
            System.out.println("个人平均分数：" + students[i].getAverage());
        }
    }
}

使用Scanner类实现控制台输入，定义一个Student类型的数组用于存放学生对象，用count变量记录已输入学生的数量，用chineseSum、englishSum、mathSum变量分别记录各科的总分数，最后计算各项平均分数并输出。