import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.PrintWriter;

public class Test {

    public static void main(String[] args) {

        // Upisivanje u txt
        PrintWriter printWriter = null;
        try {
            printWriter = new PrintWriter(new File("nazivFajla.txt"));

            // upisivanje u fajl
            printWriter.println("Neki tekst...");

        } catch (Exception ex) {
        } finally {
            if (printWriter != null) {
                printWriter.close();
            }
        }

        // Citanje iz txt
        BufferedReader bufferedReader = null;
        try {
            bufferedReader = new BufferedReader(new FileReader("nazivFajla.txt"));

            // citanje iz fajla
            String jedanRedIzFajla;
            while ((jedanRedIzFajla = bufferedReader.readLine()) != null) {

                // radim nesto sa redovima fajla...
                System.out.println(jedanRedIzFajla);

            }

        } catch (Exception ex) {
        } finally {
            if (bufferedReader != null) {
                try {
                    bufferedReader.close();
                } catch (Exception ex) {
                }
            }
        }

        // Upisivanje u bin
        ObjectOutputStream out = null;
        try {
            out = new ObjectOutputStream(new BufferedOutputStream(new FileOutputStream("nazivFajla.bin")));

            // upisivanje u fajl
            Object nekiObjekat = new Object();
            out.writeObject(nekiObjekat);

        } catch (Exception ex) {
        } finally {
            if (out != null) {
                try {
                    out.close();
                } catch (Exception ex) {
                }
            }
        }

        // Citanje iz bin
        ObjectInputStream in = null;
        try {
            in = new ObjectInputStream(new BufferedInputStream(new FileInputStream("nazivFajla.bin")));

            // citanje iz fajla
            Object nekiObjekat;
            while (true) {
                nekiObjekat = in.readObject(); // kada stignemo do kraja fajla, in.readObject() ce baciti izuzetak
                                               // na ovaj nacin cemo izaci iz ove beskonacne petlje, i to je ok

                // radim nesto sa objektom...
                System.out.println("Procitani objekat: " + nekiObjekat.toString());
            }

        } catch (Exception ex) {
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (Exception ex) {
                }
            }
        }

    }

}