So this is not a assignment but one of my lecture slide did not make it clear and when I try to code something similar myself, I run into a problem.

I can't figure out how to populate a variable that is in my subclass.

here's my test code thus far:

Implementation class:

import javax.swing.JOptionPane;

public class House {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        int count = 0;
        room[] r = new room[3];
        int option = JOptionPane.showConfirmDialog(null, "type");
        if(option==0){
            r[count]=new type();
            r[count].setSize(25);
            r[count].setType("Bedroom");
        }
        else if(option==1){
            r[count] = new room();
            r[count].setSize(25);
        }
        
        JOptionPane.showMessageDialog(null, r[count].toString());
    }
    
}

Superclass:

public class room {
    double size;
    
    public room(){
        
    }
    
    public room(double size){
        this.size=size;
    }
    
    public double getSize(){return this.size;}
    
    public boolean setSize(double size){
        if(size<0.0){
            return false;
        }
        else{
            return true;
        }
    }
     public String toString(){
         return "Room size: " + this.size;
     }
}

Subclass:

public class type extends room {
    String type;
    
    public type(){
        
    }
    
    public type (double size, String type){
        super(size); 
        this.type=type;
    }
    
    public String getType(){return this.type;}
    
    public boolean setType (String type){
        if(type.equals("")){
            return false;
        }
        else{
            return true;
        }
    }
    
    public String toString(){
        return super.toString() + "Room Type: " + this.getType();
    }
}

when i try to run the code, if I tried to insert data into setType() method in type class, it would give me an error. Can someone please tell me where I am messing up? Thanks!