Java

14605

Savollar14605

Spring Framework'da @Bean va @Service annotatsiyalarining farqi nima?

Junior — Middle

IT One

162

Spring nima ekanligini va Java dasturlashda nima uchun ishlatilishini tushuntirib bera olasizmi?

Junior — Middle

Aston Удобный Софт

МВидео+10

162

WHERE va HAVING o'rtasidagi farq nima?

Senior

IT One

161

HashMap tuzilmasida elementni qidirish samaradorligini qanday baholash mumkin?

Junior — Middle

IT One

161

Reduce metodi nima qiladi?

Senior

IT One

161

O'z darajangizni qanday baholaysiz — o'rta yoki senior?

Senior

IT One

161

Dasturlashda funksional interfeyslaridan foydalanishning asosiy maqsadi nima?

Junior — Middle

СБЕР Корпус

IT One

161

public static void main(String args[]) { checkMap(new HashMap<>()); checkMap(new LinkedHashMap<>()); checkMap(new TreeMap<>()); } private static void checkMap(Map<Person, String> map) { System.out.println("Tekshirish " + map.getClass()); Person ivan = new Person("Иван"); Person peter = new Person("Пётр"); Person maria1 = new Person("Мария"); Person maria2 = new Person("Мария"); map.put(ivan, ivan.name); map.put(peter, peter.name); map.put(maria1, maria1.name); map.put(maria2, maria2.name); // iteratsiya qilish va chiqarish for (Map.Entry<Person, String> entry : map.entrySet()) { System.out.println(entry); } // maria1.setName("Анна-Мария"); // maria2.setName("Анна-Мария"); System.out.println(map.get(maria1)); System.out.println(map.get(maria2)); System.out.println("==================================="); }

Senior

IT One

161

Qaysi to'plamani foydalanib, takrorlanmasdan va tartibni saqlab, tashrif buyurilgan sahifalar tarixini saqlash mumkin?

Senior

IT One

160

//Butun sonlar massivida takrorlanmaydigan birinchi elementni topish int[] arr = {9, 4, 9, 6, 7, 4, 5}; int n = ...;

Senior

IT One

160

Java loyihalarida ko'p oqimli ishlash tajribangiz bormi?

Junior — Middle

СБЕР Корпус DCloud

СБЕР+3

160

Java'da xotira oqishi nima? Uni topish uchun qanday algoritm ishlatiladi?

Senior

IT One

159

Xotira oqishini qanday topish mumkin (Heap Dump tahlili)?

Senior

IT One

159

public class Accumulator { private Map<String, Object> data = new HashMap<>(); // joriy ma'lumotlar to'plami private List<Map<String, Object>> dataList = new ArrayList<>(); // ma'lumotlar partiyasi private Map<Instant, String> responses = new HashMap<>(); // ma'lumotlarni qabul qiluvchi serverning javoblari private int dataId; /** * maydon field va qiymat value bilan to'plamga qo'shadi */ public void add(String field, String value) { data.put(field, value); } /** * maydon nomi bo'yicha qiymatni qaytaradi */ public <T> T get(String field) { return (T) data.get(field); } /** * ma'lumotlarni qabul qiluvchi serverning javoblarini qaytaradi */ public String getResponses() { String out = ""; for (String resp : responses.values()) { out += "; " + resp; } return out; } /** * joriy ma'lumotlar to'plamini yakunlaydi va uni partiyaga yuboradi */ public synchronized void push() { dataList.add(data); if (dataList.size() == 100) { send(); dataList.clear(); } data = new HashMap<>(); data.put("id", dataId++); } /** * ma'lumotlar partiyasini qabul qiluvchi serverga yuboradi */ private void send() { RestTemplate restTemplate = new RestTemplate(); HttpEntity<List<Map<String, Object>>> request = new HttpEntity<>(dataList); String url = "localhost:20808/msg/incoming"; ResponseEntity<String> response = restTemplate.exchange(url, HttpMethod.GET, request, String.class); responses.put(Instant.now(), response.getBody()); } }

Senior

IT One

159

Ma'lumotlar tuzilmasi stekini amalga oshirish uchun qanday to'plamdan foydalanardingiz?

Junior — Middle

IT One

158

Yaqin kelajakda rivojlantirmoqchi bo'lgan ko'nikma yoki bilimlar nimalar?

Junior — Middle

IT One

157

Kodda ob'ektlarni taqqoslash va ularning hash-kodlarini hisoblash usullarini qanday amalga oshirasiz?