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Content reference: https://www.bilibili.com/video/BV1et411b73Z?p=231 set / multiset container set container Basic concepts Introduction: all elements are automatically sorted when inserted Essence: set / multiset is an associative container, and the underlying structure is implemented by binary tree Difference between set and multiset s ...

Firstly, ArrayList and LinkedList are the implementation classes under the List interface. First, briefly introduce their basic underlying implementation; Talk about their underlying structure; 1: ArrayList It can be seen from the original code that the underlying data structure of ArrayList uses array. Moreover, because generic types can be ...

Set set framework 1: Set characteristics 1: The set set is not repeated public class dome { public static void main(String[] args) { /** * set Set characteristics * 1:----set The collection is not repeated */ //New set set Set<String> s=new HashSet<String>(); s.add("a"); s.add("b"); s.add("c"); s.add("a ...

1, Generic overview and basic usage A: Overview of generics: java generics is essentially a parameterized type, that is, the operated data type is specified as a parameter (type parameter). This parameter type can be used in the creation of classes, interfaces and methods, which are called generic classes, generic interfaces and generic m ...

1.ArrayDeque analysis 1.1 inheritance system As can be seen from its name, it is a double ended Queue implemented by array. Compared with LinkedList, which is a double ended Queue implemented by linked list, ArrayDeque implements the Queue interface and is also a common class under Collection. 1.2 common methods public interface Deque< ...

Set 1.1 Set overview and features Set set features: A collection that does not contain duplicate elementsThere is no indexed method, so you can't use a normal for loop to traverse Set set exercise Store string and traverse package com.fun01; import java.util.HashSet; import java.util.Iterator; import java.util.Set; /** * @author 23389. ...

Collection, generic, List, Collections, Set, Map 1, Collection collection 1.1 collection overview Collection: a collection is a container provided in java that can be used to store multiple data. Differences between sets and arrays: The length of the array is fixed. The length of the collection is variable.The elements of the same type are ...

1, Overview of Java collection framework 1. Understanding 1) Collection and array are structures that store multiple data, which are referred to as Java containers for short. Note: storage at this time mainly refers to memory level storage, and does not involve persistent storage (. text,. jpg,. avi, in the database). (2) Array features ...

catalogue 1. Overview of collections   2. Collection (single column) 1. Single set method   2. Between multiple sets 3. Set to array 3. List collection overview 1. ArrayList 1. Process of adding elements and capacity expansion mechanism 2. Common methods   3. Removelange() method 4. Comparator 2. LinkedList 3. Vort ...

Map interface: stored in the form of key value pairs. Key value pairs exist. Key values cannot be repeated, and value can be repeated. Methods under Map interface: Interpretation of common methods in the collection: // V put(K key, V value) adds a key value pair to the collection hashMap.put("A","a"); System.out.println(hash ...