HashMap interview questions and ConcurrentHashMap interview questions. Learn questions like how hashmap works, rehashing in concurrenthashmap and more. In “How HashMap works in Java“, we learned the internals of HashMap or ConcurrentHashMap class and how they fit into the whole concept. But ...
1. What is Java HashMap? Java HashMap is a collection that implements from theMapinterface. It has been around since JDK 1.2. HashMap is implemented on top ofHashTableand therefore they both have a lot of similarities. HashMap in Java storeskey-value pairsand provides several methods to ...
How HashMap works in Java or sometime how get method work in HashMap is common interview questions now days. Almost everybody who worked in Java knows what hashMap is, where to use hashMap or difference between hashtable and HashMap then why this interview question becomes so special? Beca...
Popular HashMap and ConcurrentHashMap interview questions In this tutorial we will go over all above queries and reasonwhy and howwe could Synchronize Hashmap? Why? The Map object is an associative containers that store elements, formed by a combination of a uniquely identifykeyand a mappedvalue....
Race condition exists while resizing hashmap in Java. If two threads, at the same time, find that Hashmap needs resizing, they both try resizing the hashMap. In the process of resizing of hashmap, the element in bucket(which is stored in linked list) get reversed in order during the mi...
In my previous post related to “How HashMap works in java“, I explained the internals of HashMap class and how they fit into whole concept. But when interviewer ask you about HashMap related concepts, he does not stop only on core concept. The discussion usually goes in multiple directio...
[1]Double Brace Initialization In Java! http://viralpatel.net/blogs/double-brace-initialization-in-java/ [2]Double Brace Initialization Idiom and its Drawbacks http://java.dzone.com/articles/double-brace-initialization [3]Hidden Features of Java http://stackoverflow.com/questions/15496/hidden...
In this quick tutorial, we’ve seen various techniques to copy aHashMapin Java, along with the concept of shallow and deep copy forHashMaps. Also, we explored some of the external libraries that are quite handy for creating shallow and deep copies. ...
Java Map Get started with Spring 5 and Spring Boot 2, through theLearn Springcourse: > CHECK OUT THE COURSE 1. Overview In this article, we are going to explore the internal implementation ofLinkedHashMapclass.LinkedHashMapis a common implementation ofMapinterface. ...
当然,这个数学计算方法,并不是在Java的官方文档中体现的,我们也无从考察到底有没有这层考虑,就像我们根本不知道鲁迅写文章时候怎么想的一样,只能推测。这个推测来源于Stack Overflow(https://stackoverflow.com/questions/10901752/what-is-the-significance-of-load-factor-in-hashmap) 0.75的必然因素 理论上我们认为...