## [code without size] implement a HashMap

Force deduction question This problem is on the power button Design hash mapping . If you think about it, it's very simple. Just design a simple HashMap class according to the design principle of hash table. A simple HashMap needs to support three methods: void put(K key, V value)V get(K key)void remove(K key) In order to implement the has ...

Posted on Mon, 29 Nov 2021 15:35:30 -0500 by Seraskier

## A "pit" in HashMap

Recently, a new partner of the company asked brother Lei a "strange" question. The problem itself is not difficult, but it is "hidden". What is the problem? Next, let's take a look. ​ cause Recently, the company's system wants to add a new list display function. The function itself is not difficult, but it has encountere ...

Posted on Sun, 28 Nov 2021 05:58:13 -0500 by Sonu Kapoor

## [xsong algorithm] phase I: sorting algorithm

Chapter 1: sorting algorithm 1.1 select sort Select sort. No matter what data goes in, it is O(N ²) The only advantage is that it does not occupy additional storage space Algorithm ideas and steps First, find the largest (small) element, store it in the starting position, and repeatedly find the smallest one back until all elements ...

Posted on Sat, 27 Nov 2021 21:35:17 -0500 by DeepakJ

## Java double instance collection map HashMap treemap

1.Map interface The Map interface defines the storage characteristics of the double instance Collection. It is not a sub interface of the Collection interface. The storage feature of double instance set is that it is stored in key and value structures. It embodies the concept of function y=f(x) in mathematics. The difference between Map and C ...

Posted on Thu, 25 Nov 2021 16:07:38 -0500 by freddy-a

## HashMap Code Implementation (JDK7 Array + Chain List)

The first thing we need to do is tap code to implement HashMap, so what is HashMap? What is the data structure? What is the underlying principle? What is i hashMap? We all know that hashMap, a storage unit that stores data as key s and value s, should also be used in projects. And hashMap is an out-of-order storage structure, so why is it o ...

Posted on Mon, 01 Nov 2021 13:27:04 -0400 by coder_

## Basic principle and underlying analysis of HashMap

HashMap basic principle and underlying source code analysis 1. Storage structure of HashMap: HashMap is composed of array, chain structure (linked list) and red black tree. The structure of red black tree is added in JDK 1.8. (the storage structure will change dynamically according to the amount of stored data). Source code implementatio ...

Posted on Wed, 27 Oct 2021 08:25:53 -0400 by xploita

## 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