why didn't work?!

import net.mindview.util.Print.*;

class Room{
    private Integer width;
    private Integer height;

    public Integer getWidth(Integer width){
        return width;
    }
    public  Room setWidth(){
        if (width !=0) {
                return width;
        }
    }

    public Integer getHeight(Integer height){
        return height;
    }
    public Room setHeight(){
        if (height !=0) {
                return height;
        }
    }

}

class RoomObj extends Room{
    private Integer x;
    private Integer y;
    private Integer height;
    private Integer width;

    public int getX(){
        return x;
    }
    public void setX(int x){
        if(x!=null){
            this.x=x;
        }
    }

    public int getY(){
        return y;
    }
    public void setY(int y){
        if (y!=0) {
            this.y=y;
        }
    }

    public Integer getWidth(Integer width){
        return width;
    }
    public RoomObj setWidth(){
        if (width !=0) {
                return width;
        }
    }

    public Integer getHeight(Integer height){
        return height;
    }
    public RoomObj setHeight(){
        if (height !=0) {
                return height;
        }
    }

}

class Table extends RoomObj{
    int x;
    int y;
}

public class Run{
    public static void main(String[] args) {
        Room room = new Room();
        room.setHeight();
        Table table = new Table();
        table.setY(1);
        table.setX(3);
    }
}