Java'da ma'lumotlarni qayta ishlashning qanday…

Takrorlash:

for, while, do-while sikllari.
Iteratorlar (Iterator, ListIterator).
Yaxshilangan for sikli (foreach).

List<String> data = new ArrayList<>();
data.add("item1");
data.add("item2");

for (String item : data) {
    System.out.println(item); // Har bir elementni ishlash
}

Streamlar:

Kolleksiyalarni deklarativ tarzda ishlash uchun API.
Yuqori darajadagi operatsiyalar: filter, map, reduce, collect.
Parallel ishlashni qo'llab-quvvatlaydi.

List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);

List<Integer> evenNumbers = numbers.stream()
                                   .filter(n -> n % 2 == 0) // Juftlarni filtrlash
                                   .collect(Collectors.toList()); // Ro'yxatga yig'ish

Parallel Streamlar:

Streamlarni avtomatik parallel qilish uchun kengaytma.
Oddiy foydalanish: .parallelStream().

List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9);

int sum = numbers.parallelStream()
                 .mapToInt(Integer::intValue)
                 .sum(); // Parallel yig'indi

RxJava / Reactor (Reaktiv dasturlash):

Asinxron ma'lumot oqimlarini reaktiv tarzda ishlash.
Observable, Flux va operatorlar (map, filter, merge) ishlatiladi.

// RxJava misol
Observable<String> source = Observable.just("Alpha", "Beta", "Gamma");

source.subscribe(s -> System.out.println("Qabul qilindi: " + s)); // Asinxron ishlash

Apache Spark / Hadoop MapReduce:
- Katta ma'lumotlarni tarqatilgan tarzda ishlash uchun frameworklar.
- ETL, tahlil va klaster bo'yicha ma'lumotlarni ishlash uchun mos.
- (Spark/Hadoop uchun kod misoli juda keng bo'lib, asosiy g'oya tarqatilgan hisoblash).
Java ma'lumot tuzilmalari:
- Ma'lumotlarni samarali saqlash va kirish uchun mos tuzilmalar (Arrays, Lists, Sets, Maps).
- Masalan, HashMap tezkor qidiruv uchun, HashSet unikal elementlar uchun.
```
Map<String, Integer> ages = new HashMap<>();
ages.put("Alice", 30);
ages.put("Bob", 25);

System.out.println(ages.get("Alice")); // Tez kirish
```

Ma'lumot bazalari (JDBC / ORM):

Tashqi bazalarda ma'lumotlarni ishlash.
SQL bilan to'g'ridan-to'g'ri ishlash uchun JDBC.
ORM (Hibernate, JPA) yordamida ob'ekt-ulararo moslik.

// JDBC misol
try (Connection conn = DriverManager.getConnection(url, user, password);
     Statement stmt = conn.createStatement();
     ResultSet rs = stmt.executeQuery("SELECT name, age FROM users")) {

    while (rs.next()) {
        String name = rs.getString("name");
        int age = rs.getInt("age");
        System.out.println("Foydalanuvchi: " + name + ", Yoshi: " + age); // Ma'lumotlarni ishlash
    }
} catch (SQLException e) {
    e.printStackTrace();
}

Yondashuv ma'lumot hajmi, ishlash talablariga, parallelizm va ishlash mantiqining murakkabligiga bog'liq.

Java'da ma'lumotlarni qayta ishlashning qanday usullari mavjud?