Question

I have this question, this is the diagram that I was given, and I have managed to come with a solution, but the actual question itself is asking me to implement the get and set methods, which I am not sure if they are applicable here,

This is just part of the a bit long question, did not want to make it look like I want my homework done by the users here by pasting the whole question, but just a doubt, if get and set methods indeed can be implemented how can I do that?

So this is my code, what I have come with so far

public abstract class Property 
{
    private static int autonumber = 0, propID,area,price;
    private String address;

    public Property(String addr, int area,int price)
    {
        autonumber++;
        propID = autonumber;
        this.area = area;
        this.price = price;
    }
     public abstract double calculateMiscFee();

     public int getArea()
     {
         return area;
     }

     public void setArea()
     {

     }
//     public double calculateMiscFee()
//     {
//         return 100*
//     }
}

This is the latest code I have

public abstract class Property 
{
    private static int autonumber = 0;
    private int propID;
    private int area;
    private double price;
    private String address;
    private int district;

    public Property(String addr, int area,double price, int district)
    {
        autonumber++;
        propID = autonumber;
        this.area = area;
        this.price = price;
        this.district = district;
        this.address = addr;

    }
     public abstract double calculateMiscFee();

     public int getArea()
     {
         return area;
     }

     public void setArea(int a)
     {
         area = a;
     }

      public String getAddress()
     {
         return address;
     }

     public void setAddress(String add)
     {
         address = add;
     }

     public double getPrice()
     {
         return price; 
     }
     public  void setPrice(double p) 
     { 
          price = p;
     }

     public int getDistrict()
     {
         return district;
     }

     public  void setDistrict(int disc) 
     { 
          district = disc;
     }
//     public double calculateMiscFee()
//     {
//         return 100*
//     }

      public String toString()
      {

      }

}

Answer 1

propID, area and price should not be static. static variables are shared between all instances of a class, and these variables should be per instance, just like address.

If a class declares a variable abc of type String, the getter and setter for abc would look like the following:

public String getAbc() {
    return abc;
}

public void setAbc(String newAbc) {
    /* Potentially do some validation of the new value
     * For example make sure it's not null, or inside reasonable ranges
     * (A price shouldn't be negative, etc.)
     */
    abc = newAbc;
}

toString() is a method which already exists in all classes, but you can still override it. For example:

class MyClass {
    private int myInt;

    public MyClass(int myInt) {
        this.myInt = myInt;
    }

    @Overrides
    public String toString() {
        return "MyClass with value " + myInt;
    }
}