java例程练习（this和super的第二个作用）

public class Test {
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", "ShangHai", "S2");
Teacher t1 = new Teacher("D", "T1");
Teacher t2 = new Teacher("D", "ShangHai", "T2");

System.out.println(p1.info());
System.out.println(p2.info());
System.out.println(s1.info());
System.out.println(s2.info());
System.out.println(t1.info());
System.out.println(t2.info());

}
}

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 Student extends Person {
private String school;

Student(String name, String location, String school) {
super(name, location);
this.school = school;
}

Student(String name,String school) {
this(name,"BeiJing", school);
}

public String info() {
return super.info() + " School: " + school;
}
}

class Teacher extends Person {
private String profession;
Teacher(String name, String location, String profession){
super(name, location);
this.profession = profession;
}

Teacher(String name, String profession) {
this(name, "BeiJing", profession);
}

public String info() {
return super.info() + " Professon: " + profession;
}
}