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 ...
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...
Most common interview questions are “How HashMap works in java”, “How get and put method of HashMap work internally”. Here I am trying to explain internal functionality with an easy example. Rather than going through theory, we will start with example first, so that you will get better...
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...
Can we use an object as a key for a HashMap in Java? This is a very popular interview question indeed. It is asked immediately after “how a HashMap works?”. Let’s make reasoning around a user-defined class as a key in hashmap in Java. 1. The Key should Honor the Contract ...
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...
It’s called generics and it’s very powerful when it comes to type-checking at compile time to remove ClassCastException at runtime. Learn more about generics inJava Generics Example. You should also readJava Collections Interview QuestionsandIterator Design Pattern in Java. ...
Most common interview questions are “How HashMap works in java”, “How get and put method of HashMap work internally”. Here I am trying to explain internal functionality with an easy example. Rather than going through theory, we will start with example first, so that you will get better...
在Java 8之前,如果发生碰撞的时候,Hashmap通过链表将产生碰撞冲突的元素组织起来,在产生碰撞的情况下,进行get时,两步的时间复杂度是O(1)+O(n)。因此,当碰撞很厉害的时候n很大,O(n)的速度显然是影响速度的。 因此在Java 8中,如果一个bucket中碰撞冲突的元素超过某个限制(默认是8),则使用红黑树来替换链表,这...
Java HashMap Most common interview questions are <code>How HashMap works in java</code>, “How get and put method of HashMap work internally”. Here I am trying to explain internal functionality with an easy example. HashMap is one of the most used Collections in java.Rather than going ...