apteka

public class raf {

    static String apteka(String plik) throws FileNotFoundException{
    int porown = 9999;
    String najtanszy = " ";

    try{

    RandomAccessFile raf = new RandomAccessFile(plik, "rw");
    String line;

    while( (line = raf.readLine())!= null){
    String lek = line;
    long pos1 = raf.getFilePointer();
    int cena = Integer.parseInt(raf.readLine());
    Boolean refund = Boolean.parseBoolean(raf.readLine());
    long pos2 = raf.getFilePointer();

    if(refund) {
    raf.seek(pos1);
    raf.writeBytes(Long.toString(Math.round(cena*0.85)));

    String cenaxd = Long.toString(Math.round(cena*0.85));
    cena = Integer.parseInt(cenaxd);
    raf.seek(pos2);
    }


    if(cena<porown){
        porown=cena;
        najtanszy=lek;}

    }

    }
    catch(Exception e){System.out.println(e);}



    return najtanszy;}