// PISANJE U FILE - prepisuje postojeći sadržaj
Path path = Path.of("podaci.txt");

try (BufferedWriter writer = Files.newBufferedWriter(path, StandardCharsets.UTF_8)) {
    writer.write("Prvi red");
    writer.newLine();
    writer.write("Drugi red");
    writer.newLine();
} catch (IOException e) {
    System.out.println(e.getMessage());
}
// PISANJE U FILE - dodavanje na kraj
Path path = Path.of("podaci.txt");

try (BufferedWriter writer = Files.newBufferedWriter(
        path,
        StandardCharsets.UTF_8,
        StandardOpenOption.APPEND
)) {
    writer.write("Novi red");
    writer.newLine();
} catch (IOException e) {
    System.out.println(e.getMessage());
}
// BRZO PISANJE CIJELOG TEKSTA
Path path = Path.of("podaci.txt");

try {
    Files.writeString(path, "Ovo je tekst\nDrugi red", StandardCharsets.UTF_8);
} catch (IOException e) {
    System.out.println(e.getMessage());
}
// BRZO DODAVANJE TEKSTA NA KRAJ
Path path = Path.of("podaci.txt");

try {
    Files.writeString(
            path,
            "Novi red\n",
            StandardCharsets.UTF_8,
            StandardOpenOption.APPEND
    );
} catch (IOException e) {
    System.out.println(e.getMessage());
}
// ČITANJE FILEA RED PO RED
Path path = Path.of("podaci.txt");

try (BufferedReader reader = Files.newBufferedReader(path, StandardCharsets.UTF_8)) {
    String line;

    while ((line = reader.readLine()) != null) {
        System.out.println(line);
    }
} catch (IOException e) {
    System.out.println(e.getMessage());
}
// ČITANJE CSV-A RED PO RED + SPLIT
Path path = Path.of("gradovi.csv");

try (BufferedReader reader = Files.newBufferedReader(path, StandardCharsets.UTF_8)) {
    String line;

    reader.readLine(); // preskoči header

    while ((line = reader.readLine()) != null) {
        String[] p = line.split(",");

        String naziv = p[0];
        String drzava = p[1];
        long populacija = Long.parseLong(p[2]);

        System.out.println(naziv + " " + drzava + " " + populacija);
    }
} catch (IOException e) {
    System.out.println(e.getMessage());
}
// ČITANJE CIJELOG FILEA U STRING
Path path = Path.of("podaci.txt");

try {
    String tekst = Files.readString(path, StandardCharsets.UTF_8);
    System.out.println(tekst);
} catch (IOException e) {
    System.out.println(e.getMessage());
}
// ČITANJE SVIH LINIJA U LISTU
Path path = Path.of("podaci.txt");

try {
    List<String> lines = Files.readAllLines(path, StandardCharsets.UTF_8);

    for (String line : lines) {
        System.out.println(line);
    }
} catch (IOException e) {
    System.out.println(e.getMessage());
}
// ČITANJE CSV-A U LISTU STRINGOVA, BEZ HEADERA
Path path = Path.of("gradovi.csv");

try {
    List<String> lines = Files.readAllLines(path, StandardCharsets.UTF_8);

    for (int i = 1; i < lines.size(); i++) {
        String[] p = lines.get(i).split(",");

        String naziv = p[0];
        String drzava = p[1];
        long populacija = Long.parseLong(p[2]);

        System.out.println(naziv + " " + drzava + " " + populacija);
    }
} catch (IOException e) {
    System.out.println(e.getMessage());
}
// PISANJE CSV-A
Path path = Path.of("gradovi.csv");

try (BufferedWriter writer = Files.newBufferedWriter(path, StandardCharsets.UTF_8)) {
    writer.write("naziv,drzava,populacija");
    writer.newLine();

    writer.write("Zagreb,Hrvatska,800000");
    writer.newLine();

    writer.write("Berlin,Njemacka,3600000");
    writer.newLine();

    writer.write("Madrid,Spanjolska,3200000");
    writer.newLine();
} catch (IOException e) {
    System.out.println(e.getMessage());
}
// ČITANJE CSV-A + FILTRIRANJE
Path path = Path.of("gradovi.csv");

try (BufferedReader reader = Files.newBufferedReader(path, StandardCharsets.UTF_8)) {
    String line;

    reader.readLine();

    while ((line = reader.readLine()) != null) {
        String[] p = line.split(",");

        String naziv = p[0];
        String drzava = p[1];
        long populacija = Long.parseLong(p[2]);

        if (populacija > 1_000_000) {
            System.out.println(naziv + " - " + drzava + " - " + populacija);
        }
    }
} catch (IOException e) {
    System.out.println(e.getMessage());
}
// PISANJE BINARNIH PODATAKA
try (DataOutputStream out = new DataOutputStream(
        new BufferedOutputStream(
                new FileOutputStream("studenti.bin")))) {

    out.writeInt(2); // broj zapisa

    out.writeUTF("Ana");
    out.writeUTF("12345");
    out.writeInt(1);
    out.writeDouble(4.5);

    out.writeUTF("Marko");
    out.writeUTF("67890");
    out.writeInt(2);
    out.writeDouble(3.8);
}
// ČITANJE BINARNIH PODATAKA
try (DataInputStream in = new DataInputStream(
        new BufferedInputStream(
                new FileInputStream("studenti.bin")))) {

    int brojStudenata = in.readInt();

    for (int i = 0; i < brojStudenata; i++) {
        String ime = in.readUTF();
        String jmbag = in.readUTF();
        int godina = in.readInt();
        double prosjek = in.readDouble();

        System.out.println(ime + " " + jmbag + " " + godina + " " + prosjek);
    }
}
// PISANJE OBJEKTA
try (ObjectOutputStream out = new ObjectOutputStream(
        new FileOutputStream("korisnik.ser"))) {

    out.writeObject(korisnik);
}
// ČITANJE OBJEKTA
try (ObjectInputStream in = new ObjectInputStream(
        new FileInputStream("korisnik.ser"))) {

    Korisnik korisnik = (Korisnik) in.readObject();

    System.out.println(korisnik);
}

//Novo
//Pjesma
package hr.algebra.blitz04.rp1.zadatak1;

import java.io.Serializable;

public class Pjesma implements Serializable {

    private static final long serialVersionUID = 1L;

    private int id;
    private String naslov;
    private String izvodac;
    private double trajanje;

    public Pjesma() {
    }

    public Pjesma(int id, String naslov, String izvodac, double trajanje) {
        this.id = id;
        this.naslov = naslov;
        this.izvodac = izvodac;
        this.trajanje = trajanje;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getNaslov() {
        return naslov;
    }

    public void setNaslov(String naslov) {
        this.naslov = naslov;
    }

    public String getIzvodac() {
        return izvodac;
    }

    public void setIzvodac(String izvodac) {
        this.izvodac = izvodac;
    }

    public double getTrajanje() {
        return trajanje;
    }

    public void setTrajanje(double trajanje) {
        this.trajanje = trajanje;
    }

    @Override
    public String toString() {
        return "Pjesma{" +
                "id=" + id +
                ", naslov='" + naslov + '\'' +
                ", izvodac='" + izvodac + '\'' +
                ", trajanje=" + trajanje +
                '}';
    }
}
//Zadatak1 main
package hr.algebra.blitz04.rp1.zadatak1;

import java.io.*;
import java.util.ArrayList;
import java.util.List;

public class Main {

    public static void main(String[] args) {

        List<Pjesma> pjesme = new ArrayList<>();

        pjesme.add(new Pjesma(1, "Lose Yourself", "Eminem", 5.26));
        pjesme.add(new Pjesma(2, "Numb", "Linkin Park", 3.15));
        pjesme.add(new Pjesma(3, "Believer", "Imagine Dragons", 3.24));

        try (ObjectOutputStream oos = new ObjectOutputStream(
                new BufferedOutputStream(
                        new FileOutputStream("podaci.ser")))) {

            oos.writeObject(pjesme);

        } catch (IOException e) {
            e.printStackTrace();
        }

        try (ObjectInputStream ois = new ObjectInputStream(
                new BufferedInputStream(
                        new FileInputStream("podaci.ser")))) {

            List<Pjesma> ucitanePjesme = (List<Pjesma>) ois.readObject();

            for (Pjesma p : ucitanePjesme) {
                System.out.println(p);
            }

        } catch (IOException | ClassNotFoundException e) {
            e.printStackTrace();
        }
    }
}
//Zadatak2 main
package hr.algebra.blitz04.rp1.zadatak2;

import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import hr.algebra.blitz04.rp1.zadatak1.Pjesma;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;

public class Main {

    public static void main(String[] args) {

        ObjectMapper mapper = new ObjectMapper();
        mapper.enable(SerializationFeature.INDENT_OUTPUT);

        List<Pjesma> pjesme = new ArrayList<>();

        pjesme.add(new Pjesma(1, "Lose Yourself", "Eminem", 5.26));
        pjesme.add(new Pjesma(2, "Numb", "Linkin Park", 3.15));
        pjesme.add(new Pjesma(3, "Believer", "Imagine Dragons", 3.24));

        Path path = Path.of("podaci.json");

        try {

            mapper.writeValue(path.toFile(), pjesme);

            String json = Files.readString(path);
            System.out.println(json);

            List<Pjesma> ucitanePjesme =
                    mapper.readValue(path.toFile(),
                            new TypeReference<List<Pjesma>>() {});

            for (Pjesma p : ucitanePjesme) {
                System.out.println(p);
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}