oop1 Pekara(vezba)

import java.io.*;
class Proizvod{
    private int tezina;
    private double cena;
    private int lager;

    Proizvod(int tezina, double cena, int lager){
        this.tezina = tezina;
        this.cena = cena;
        this.lager = lager;
    }

    public int getTezina(){
        return tezina;
    }
    public void setTezina(int tezina){
        this.tezina = tezina;
    }

    public double getCena(){
        return cena;
    }
    public void setCena(double cena){
        this.cena = cena;
    }

    public int getLager(){
        return lager;
    }
    public void setLager(int lager){
        this.lager = lager;
    }

    public String toString(){
        StringBuilder sb = new StringBuilder();
        sb.append(getClass().getName()).append("  tezina:  ").append(tezina)
        .append("  cena:  ").append(cena)
        .append("  lager:  ").append(lager).append(".;\n");
        return sb.toString();
    }

    public void zvakni(int i) {
        // TODO Auto-generated method stub

    }
}

class Burek extends Proizvod{
    private String fil;

    Burek(int tezina,double cena,int lager){
        super(tezina,cena,lager);
        fil = null;
    }

    public void filuj(String fil){
        this.fil = fil;
        setCena(getCena()+10.0);
    }

    public void smazi(){
        setLager(0);
    }

    public String toString(){
        StringBuilder sb = new StringBuilder();
        if(fil == null){
            sb.append(getClass().getName()).append(" tezina: ").append(getTezina())
            .append(" cena: ").append(getCena())
            .append(" lager: ").append(getLager()).append(" fill je prazan").append(".;\n");
        } else {
            sb.append(getClass().getName()).append(" tezina: ").append(getTezina())
            .append(" cena: ").append(getCena())
            .append(" lager: ").append(getLager()).append(" fil: ").append(fil).append(".;\n");
        }
        return sb.toString();
    }
}

class Pecivo extends Proizvod{

    Pecivo(int tezina,double cena,int lager){
        super(tezina,cena,lager);
    }

    public void zvakni(int k){
        if(getLager() >= k){
            setLager(getLager()-k);
        } else {
            setLager(0);
        }
    }
}

class Kroasan extends Proizvod{

    Kroasan(double cena, int lager){
        super(100,cena,lager);
    }

    public void zvakni(){
        super.zvakni(100);
    }
}

public class Pekara{

    public static void main(String[] args)throws Exception{
        Burek[] nizBurek;
        BufferedReader bf = new BufferedReader(new FileReader("ovo.txt"));
        System.out.println("Pocetak izvrsavanja programa");
        int brElem = Integer.parseInt(bf.readLine());
        nizBurek = new Burek[brElem];

        for(int i = 0; i < brElem; i++){
            nizBurek[i] = new Burek(Integer.parseInt(bf.readLine()),
            Double.parseDouble(bf.readLine()),Integer.parseInt(bf.readLine()));
            nizBurek[i].filuj(bf.readLine());
        }
        bf.close();

        for(int i = 0; i < brElem; i++){
            System.out.println(nizBurek[i].toString());
        }

    }
}