class Person {
    String name = "noname"; //姓名
    int age = 0;            //年龄
    char sex = 'M';         //性别
    public void sport(String item) {
        System.out.println(name + "参加了" + item + "运动");
    } // sport方法结束
} // 类Person结束

// 声明"学生"类
class Student extends Person {
    int degree; //分数
    int grade;  //年级
    Student(String name, int age, char sex, int grade, int degree) {
        this.name = name;
        this.age = age;
        this.sex = sex;
        this.grade = grade;
        this.degree = degree;
    } // 构造方法结束
    
    public void learn(String knowledge) {
        System.out.println(name + "学习了" + knowledge + "知识");
    } // learn()方法结束
} // 类Student结束