Java 构造过程

class Person {
  private String name;
  private String location;

  Person(String name) {
    this.name = name;
    location = "beijing";
  }

  Person(String name,String location) {
    this.name = name;
    this.location = location;
  }

  public String info() {
    return
      "name: "+name+
      " location: "+location;
  }
}

class Teacher extends Person {
    private String capital;

    Teacher(String name, String capital) {
        this(name, "beijing", capital);
    }

    Teacher(String n, String l, String capital) {
        super(n, l);
        this.capital = capital;
    }

    public String info() {
        return super.info() + "capital " + capital;
    }
}

class Student extends Person {
    private String school;
    Student(String name, String school) {
        this(name,"beijing", school);
    }
    Student(String n,String l,String school) {
        super(n,l);
        this.school = school;
    }
    public String info() {
        return super.info()+
     " school: "+school;
    }
}

public class TestTeacher {
    public static void main(String[] args) {
        Person p1 = new Person("A");
        Person p2 = new Person("B","shanghai");
        Student s1 = new Student("C","S1");
        Student s2 = new Student("C","shanhai","S2");

        System.out.println(p1.info());
        System.out.println(p2.info());
        System.out.println(s1.info());
        System.out.println(s2.info());

        Teacher t1 = new Teacher("D", "Professor");
        System.out.println(t1.info());
    }
}