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  the golden three silver four is a good time for job hopping and salary increase. BOGO has sorted out a lot of high-frequency interview questions to help you find a better job. Oh, pay attention and thank you for your support. Object oriented interview questions 1. Talk about your understanding of object-oriented thinking? Process or ...

Containers in STL: set container common interfaces and usage of multiset container: set / multiset container: also known as a set, all elements are automatically sorted when inserted (from small to large, i.e. ascending) Bottom structure of set / multiset container: these two containers belong to associative containers, and the bottom stru ...

This paper summarizes the Java collection framework Here are some articles about collections https://blog.csdn.net/weixin_42533238/article/details/106651056 https://blog.csdn.net/ThinkWon/article/details/98844796 https://blog.csdn.net/feiyanaffection/article/details/81394745 Take a look at the structure chart first to get a general impres ...

brief introductionCopyOnWriteArrayList is a thread safe version of ArrayList. It is also implemented internally through arrays. Each time the array is modified, a new array is completely copied to modify it. After modification, the old array is replaced. In this way, only write operations are blocked, read operations are not blocked, and read-w ...

Set type of redis value basic data type 1. Why characteristic disorderduplicate removal Application scenario Collection operation. Finding intersection, union and difference sets Random events. Solve the lottery problem: 10 prize users < 10, and the winning points of users are whether to repeat or not Positive number de du ...

LinkedList source code interpretation Inheritance structure of LinkedList Properties of LinkedList LinkedList constructor The core method of LinkedList FailFast mechanism Inheritance structure of LinkedList public class LinkedList<E> extends AbstractSequentialList<E> implements List<E>, Deque<E>, ...

🧭 Implementation class of Map interface HashMap 🚀HashMap HashMap is an implementation class of Map interface, which is displayed in blog Java Map interface We have used HashMap to summarize the commonly used methods. HashMap is the most frequently used implementation class of Map interface.HashMap stores data in the form of key value ...

1, Fail fast When traversing a collection object with an iterator, if the contents of the collection object are modified (added, deleted, modified) during the traversal, an exception will be thrown ConcurrentModificationException. one ️⃣ Principle: the iterator directly accesses the contents of the collection during traversal, and uses a mod ...

1, Overview and test of unique functions of List collection 1. void add(int index,E element) adds an element at the specified position. The test is as follows: public static void main(String[] args) { List list = new ArrayList(); list.add("a"); list.add("b"); list.add("c"); list.add("d"); l ...

1, Basic function test of Collection The first method: Boolean add (E) add elements. The test is as follows: public static void main(String[] args) { Collection c = new ArrayList(); //A parent class reference points to a child class object boolean b1 = c.add("abc"); boolean b2 = c.add(true); //Auto boxing new Bo ...