java菜鸟问题

Question

public class NotSpecialtyDoctor extends Doctor {
private int salary;
public NotSpecialtyDoctor( String name,String ID, String address,int salary) {

super(name, ID, address);
this.salary=salary;
}
public static void main(String[] args) {
NotSpecialtyDoctor doctor = new NotSpecialtyDoctor("lisi","2001","Ameirican",3000);
System.out.println(doctor);
}
}
为什么 3000不输出，如何让它输出

Answer 1

public class NotSpecialtyDoctor extends Doctor {
private int salary;
public NotSpecialtyDoctor( String name,String ID, String address,int salary) {super(name, ID, address);
this.salary=salary;
}@Override
public String toString() {
//调用父类Doctor的toString方法得到父类的输出，然后用父类的输出加上子类的薪水就可以了
String str = super.toString();
System.out.println(str + "    " + salary);
}
public static void main(String[] args) {
NotSpecialtyDoctor doctor = new NotSpecialtyDoctor("lisi","2001","Ameirican",3000);
System.out.println(doctor);
}
}
楼主好运！

Answer 2

public class NotSpecialtyDoctor extends Doctor {
private int salary;
public NotSpecialtyDoctor( String name,String ID, String address,int salary) {super(name, ID, address);
this.salary=salary;
}
public static void main(String[] args) {
NotSpecialtyDoctor doctor = new NotSpecialtyDoctor("lisi","2001","Ameirican",3000);
System.out.println(doctor.name+doctor.ID+doctor.address+doctor.salary);
}
}
class Doctor
{
String name,ID;
String address;
public Doctor(String name,String ID,String address)
{
this.name=name;
this.ID=ID;
this.address=address;
}
}

Answer 3

楼主类属性都是private的，不要改了楼主的意思，这样是不是破坏了类的封装性呢？