Help Me With Classes Please...

Question

ok i just starting programming in java about 4 weeks ago and i am a real novice so i could use a lot of help on this little problm.
anyway its basically a system to keep information for a hospital about their patients. there is a class and a sub-class. Patients is main class with attributes like ID, Name, Phone. Observations is a sub-class of Patients and has a sub-class of its own called Measurement-Observations with attributes like height and weight. (basically this: patients -> observations -> measurements) with the attributes slotted in there too of course.
so i was wondering how some of u experts would go about firstly declaring the class and sub-class and then go about adding a patients information into both classes when done.
any help is greatly appreciated, thanx

Answer 1

Let Patients be the main class
public abstract class Patients
   public abstract void setID(int ID);
   public abstract int getID();
   public abstract void setName(String name);
   public abstract String getName();
   public abstract void setPhoneNumber(String phone);
   public abstract String getPhoneNumber(); 
//Observations inherits from Patients
public class Observations extends Patients
   //declare variables
   private int ID;
   private String name;
   private String phoneNumber;
   //Constructor
   public Observations(int ID, String name, String phoneNumber)
       this.ID = ID;
       this.name = name;
       this.phoneNumber= phoneNumber;
   public void setID(int ID)
       this.ID = ID;
   public int getID()
      return ID;
   public void setName(String name)
      this.name = name;
   public String getName()
       return name;
   public void setPhoneNumber(String phoneNumber)
      this.phoneNumber = phoneNumber;
   public String getPhoneNumber()
      return phoneNumber;
}And your Measurement-Observations class inherits from Observations
public class Measurement-Observations extends Observations
   private int ID;
   private String name;
   private String phoneNumber;
   private double height;
   private double weight;
   public Measurement-Observations(int ID, String name, String phoneNumber, double height, double weight)
       super();
       this.height = height;
       this.weight = weight;
   public void setHeight(double height)
      this.height = height;
   public double getHeight()
      return height;
   public void setWeight(double weight)
      this.weight = weight;
   public double getweight()
      return weight;
}How to use this in an application?
This is an example..a simpel one :)
import java.util.*;
public class MyPatients
   private Vector patientinfo;
   public static void main(String[] args)
       new MyPatients();
   public MyPatients
       patientinfo = new Vector();
       //to add info about a patient
       patientinfo.addElement(new Measurement-Observations(1, "John Smith",
"086-5768", 6.2D, 160);