java之子类对象实例化过程

public class Person{
    public Person(){}
    public String name = "tom";
    public int age = 1;
    public int sex = 0;
    public void showInfo(){
        System.out.println(this.name);
        System.out.println(this.age);
        System.out.println(this.sex);
    }
    public void seInfo(String name, int age, int sex){
        this.name = name;
        this.age = age;
        this.sex = sex;
    }
}

public class Student extends Person{
    public Student(){
        super();
    }
    public String school;
}