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A Telegram channel dedicated to Java programming challenges, quizzes, and test exercises. It provides resources and support for users seeking to improve their Java coding skills.

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Java задачи и тесты По всем вопросам- - 🔥лучшие ит-каналы - 🐍 - ml - AI - ml 📚 -📚

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☕ Java-баг, который выглядит нормально, но ломает `HashMap` Что выведет этот код? Map<List<Integer>, String> map = new HashMap<>(); List<Integer> key = new ArrayList<>(List.of(1, 2)); map.put(key, "Ritesh"); key.add(3); System.out.println(map.get(key)); Многие ожидают: Ritesh Но результат: ```text null ``` Почему? HashMap ищет ключ через: ```java hashCode() equals() ``` Когда мы сделали: ```java map.put(key, "Ritesh"); ``` ключ был: ```text [1, 2] ``` У него был один hashCode. Но потом: ```java key.add(3); ``` ключ стал: ```text [1, 2, 3] ``` И его hashCode изменился. H

2026-08-17👁 713

❓Что из вариантов лучше всего описывается определением: Операция, которая содержит серию задач, которые должны быть выполнены либо все, либо не выполнена ни одн #spring

2026-07-19👁 799

#java #ocp

2026-06-09👁 889
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