HashMap source code analysis

HashMap for Java source code analysis 1, HashMap source code analysis 1. Data structure of HashMap jdk7 before: array + linked list After jdk8: array + linked list + red black tree public class HashMap<K,V> extends AbstractMap<K,V>    implements Map<K,V>, Cloneable, Serializable {        static class Node<K,V> i ...

Posted on Wed, 13 Oct 2021 16:23:59 -0400 by hairulazami

JAVA Collection Series: HashMap

Introduction to HashMap HashMap is a hash table that stores key value mappings.HashMap   The Map interface implementation based on hash table is one of the commonly used Java collections and is thread unsafe.HashMap   Null keys and values can be stored, but there can only be one null as a key and multiple null as a value.HashMap &nbs ...

Posted on Thu, 30 Sep 2021 18:16:20 -0400 by YuriM

HashMap collection of common interview questions summary and source code analysis

HashMap collection of common interview questions summary and source code analysis 1. Introduction to HashMap collection HashMap is implemented based on the Map interface of hash table. It exists in the form of key value storage, that is, it is mainly used to store key value pairs. The implementation of HashMap is not synchronous, which means ...

Posted on Tue, 28 Sep 2021 22:06:20 -0400 by bk6662

Common interview questions in Java collection of school recruitment interview

Interview summary The main questions in this section are ArrayList and HashMap. HashMap this piece of source code must be understood. In the eyes of some interviewers, it is a necessary foundation. Question summary and answer sorting (for reference only) 1. The difference between ArrayList and LinkedList (both thread unsafe) ArrayList i ...

Posted on Sat, 25 Sep 2021 02:02:54 -0400 by phrygius

Java collection -- implementation classes of Map interface HashMap, LinkHashMap, TreeMap and Properties

HashMap class 1. HashMap class overview HashMap is the most frequently used implementation class of Map interface, which allows the use of null keys and null values. Like HashSet, the mapping order is not guaranteed. The Set composed of all keys is Set: unordered and non repeatable. Therefore, the class where the key is located sho ...

Posted on Wed, 22 Sep 2021 12:56:42 -0400 by ToeBee