JAVA 子类重写继承父类的方法

public class Human {
    private String name;
    private String sex;
    private int age;

    public String getName() {
        return name;
    }

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

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public int getAge() {
        return age;
    }

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

    void run(){
        System.out.println("跑步使我快乐");
    }
}
class Teacher extends Human{
    private String add;

    public String getAdd() {
        return add;
    }

    public void setAdd(String add) {
        this.add = add;
    }
    void run(){
        System.out.println("跑步使我健康");
    }
}
class Student1 extends Human{
    private String classmate;

    public String getClassmate() {
        return classmate;
    }

    public void setClassmate(String classmate) {
        this.classmate = classmate;
    }
    void run(){
        System.out.println("跑步时我年轻");
    }
}
class test{
    public static void main(String[] args) {
        Human h1 = new Human();
        h1.setAge(18);
        h1.setName("a");
        h1.setSex("男");
        h1.run();
        System.out.println("他的性别为"+h1.getSex()+"\n他的名字是"+h1.getName()+"\n他的年龄为"+h1.getAge());
        Teacher t1 = new Teacher();
        t1.setAdd("南方");
        t1.setAge(18);
        t1.setName("b");
        t1.setSex("男");
        t1.run();
        System.out.println("他的籍贯是"+t1.getAdd()+"\n他的性别为"+t1.getSex()+"\n他的名字是"+t1.getName()+"\n他的年龄为"+t1.getAge());

        Student1 s1 = new Student1();
        s1.setClassmate("一班");
        s1.setAge(18);
        s1.setName("c");
        s1.setSex("女");
        s1.run();
        System.out.println("他的班级是"+s1.getClassmate()+"\n他的性别为"+s1.getSex()+"\n他的名字是"+s1.getName()+"\n他的年龄为"+s1.getAge());


    }