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...
2. Is Java HashMap ordered / sorted? Java HashMap does not keep theorderof inserted objects. This means that when you iterate over a map the objects are in a random order. But you can access values in a map by the keys. We’ll take a look at this a bit later under examples. ...
There are many ways to compareHashMaps in Java. We can compare them using theequals()method. The default implementation compares each value. If we change the inner Map’s contents, the equality check fails. If the inner objects are all new instances every time in the case of user-defined...
Java hashCode() and equals() – Contract, rules and best practices HashMap and ConcurrentHashMap Interview Questions Java ConcurrentHashMap Best Practices Convert JSON to Map and Map to JSON Marshal and Unmarshal HashMap in Java How to Find Duplicate Words in String using HashMap Compare two ha...
[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...
How HashMap works in Java? 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 que...
We used Hashmap in both above examples but those are pretty simple use cases of Hashmap.HashMap is a non-synchronizedcollection class. Do you have any of below questions? What’s the difference between ConcurrentHashMap and Collections.synchronizedMap(Map)?
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 this post, I will try to cover some relatedinterview questionsusually occur next in chain: Topics covered in this post: How you will design a good key for HashMap? Difference between HashMap and ConcurrentHashMap? Difference between HashMap and Collections.synchronizedMap(HashMap)?
Java Collections Java Map Get started with Spring 5 and Spring Boot 2, through theLearn Springcourse: > CHECK OUT THE COURSE 1. Introduction In this quick tutorial, we’ll learn how tosort aHashMapin Java. More specifically, we’ll look at sortingHashMapentries by their key or value usin...