To better visualize the ConcurrentHashMap, let it consider as a group of HashMaps. To get and put key-value pairs from hashmap, you have to calculate the hashcode and look for correct bucket location in array of
In “How HashMap works in Java“, we learned the internals of HashMap or ConcurrentHashMap class and how they fit into the whole concept. But when the interviewer asks you about HashMap related concepts, he does not stop only on the core concept. The discussion usually goes in multiple d...
ConcurrentHashMapclass is fully interoperable with Hashtable in programs that rely on its thread safety but not on its synchronization details. Read More:ConcurrentHashMap Interview Questions. 14. How Hashmap Works? This question is themost importantand is most likely to be asked at every job i...
实例化ConcurrentHashMap时带参数时,会根据参数调整table的大小,假设参数为100,最终会调整成256,确保table的大小总是2的幂次方,算法如下: ConcurrentHashMap<String, String> hashMap = new ConcurrentHashMap<>(100); private static final int tableSizeFor(int c) { int n = c - 1; n |= n >>> 1; ...
ConcurrentHashMap in Java versions before JDK 1.8 uses an array of Segments:Segment< K,V >[] segments Segment inherits from ReenTrantLock, so each Segment is a reentrant lock. Each Segment has aHashEntry< K,V >array to store data. During put operation, it is only necessary to lock this...
ConcurrentHashMap 是如何保证线程安全的? ▲ 11 HashMap 实现原理,为什么使用红黑树? ▲ 9 hashMap 1.7 / 1.8 的实现区别 ▲ 9 简述 Java的反射机制 ▲ 6 Java 线程间有多少通信方式? ▲ 6 简述 Synchronized,volatile,可重入锁的不同使用场景及优缺点...
Use Collections.synchronizedMap(new HashMap<>) or ConcurrentHashMap for better concurrent performance. 13) What is the parent class of exceptions in Java? The root class is Throwable, and has two main subclasses: Exception and Error. 14) What is the difference between function and procedure in...
Java Collection Framework interviewquestions and answerscontains questions from popular Java collection classes e.g.HashMap,ArrayList,HashSet,ConcurrentHashMapand legacy collection classes like Vector andHashtable. Interview questions from Java Collection framework is one of the most asked concept on anyCor...
ConcurrentHashMap 的工作原理及代码实现,如何统计所有的元素个数 手写简单的HashMap Arraylist与LinkedList默认空间是多少; Arraylist与LinkedList区别与各自的优势List 和 Map 区别; 谈谈HashMap,哈希表解决hash冲突的方法; Java Collections和Arrays的sort方法默认的排序方法是什么; HashSet方法里面的hashcode存在...
We can use concurrent collection classes to avoid `ConcurrentModificationException` while iterating over a collection, for example CopyOnWriteArrayList instead of ArrayList. Check this post for [ConcurrentHashMap Example](/community/tutorials/concurrenthashmap-in-java). Why there are no concrete implemen...