/**
 * Created by markort2815 on 21.11.17..
 */
import java.io.*;

public class app {
    public static void main(String[] args) {

        File f = new File("licence.bin");

        if(!f.exists()){
            try {
                Settings def = new Settings();
                f.createNewFile();
                def.upisi("licence.bin");
                System.out.println("Datoteka kreirana!");
            } catch (IOException e) {
                e.printStackTrace();
            }
        }else {
            System.out.println("Datoteka vec postoji");
            Settings cit =null;
            cit = Settings.procitaj("licence.bin");
            System.out.println(cit);
        }
    }
}

import java.io.*;

/**
 * Created by markort2815 on 21.11.17..
 */
public class Settings implements Serializable {
    private String korisnickoime;
    private String licenca;
    private int vreme;

    public Settings(String korisnickoime, String licenca, int vreme) {
        this.korisnickoime = korisnickoime;
        this.licenca = licenca;
        this.vreme = vreme;
    }

    public Settings() {
        this.korisnickoime = "evaluate";
        this.licenca = "0000-0000-0000-0000";
        this.vreme = 1;
    }

    public static Settings procitaj(String path){
        try {
            FileInputStream fileInputStream = new FileInputStream(path);
            ObjectInputStream objectInputStream = new ObjectInputStream(fileInputStream);
            Settings load = (Settings)objectInputStream.readObject();
            fileInputStream.close();
            objectInputStream.close();
            return load;
        }catch (IOException e){
            e.printStackTrace();
            return null;
        }catch (ClassNotFoundException e){
            e.printStackTrace();
            return null;
        }
    }

    public void upisi(String path){
        try {
            FileOutputStream fileOutputStream = new FileOutputStream(path);
            ObjectOutputStream objectOutputStream = new ObjectOutputStream(fileOutputStream);
            objectOutputStream.writeObject(this);
            objectOutputStream.close();
            fileOutputStream.close();
        }catch (IOException e){
            e.printStackTrace();
        }
    }

    @Override
    public String toString() {
        return "Settings{" +
                "korisnickoime='" + korisnickoime + '\'' +
                ", licenca='" + licenca + '\'' +
                ", vreme=" + vreme +
                '}';
    }
}