Class diagrams related to Java data structures Map, List, Set and Queue
With nothing to do, I drew a class diagram of the relevant data structures and their relationships in the util package and shared it with everyone. Overview image: Map ： List and Set： Queue： Class diagrams related to Java data structures Map, List, Set and Queue,, Java data structures Map, List, Class diagrams related to Set and Queue
List<List> and List are incompatible types in java
java list cas Write your review! Come on, watch it all Member login | User registration Recommended reading io 50 essential code implementations for data structures and algorithms Heavy-duty information, delivered as soon as possible Data structures and algorithms are programmers’ inner skills and basic skills. Whether it is artificial intelligence or other computer science fields, mastering solid knowledge of data structures and algorithms often… [detailed] Crayon Shin-chan 2023-09-25 22:30:54 string java inputs the number N and determines whether the sum of the digits of N is a palindrome number For example, if you input 56 and the digits add up to 5611, to determine whether 11 is a palindrome, you must first take out each digit. publicclassTest3{publicstaticvoidmain(Stri… [detailed] Crayon Shin-chan 2023-09-25 22:27:28
UML demonstration of Java serialization 82Set, Collection, List, and Map
1. UML Demonstration Collection Collection Collection Inheritance Structure Diagram 2. Set collection 1. Characteristics of List storage elements: ordered and repeatable. In order, what is the order in which they are stored and what order they are taken out. 2. Characteristics of Set storage elements: unordered and non-repeatable. When they are stored in the same order, when they are taken out, they may not be in the original order. 3.SortedSet features Characteristics of storing elements: Unordered and non-repeatable, but the stored elements can be automatically sorted according to the size of the elements. 3. Introduction to the underlying data structure of commonly used collection classes 1. The bottom layer of ArrayList uses an array to store elements, so the ArrayList collection is suitable for querying, but not suitable for frequent random additions and deletions of elements. 2. The bottom layer of LinkedList uses a two-way linked list. This data structure stores data. Linked lists are suitable for frequent additions and deletions of elements, but are not suitable for query operations. 3. The bottom layer of Vector is the same as the ArrrayList collection, but Vector is thread-safe and less efficient, so it is rarely used now. 4. Map collection inheritance…
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[Reprint] Detailed explanation of the relationship between ArrayList, List, LinkedList, and Collection in java
Reprint link: http://www.cnblogs.com/liqiu/p/3302607.html Detailed explanation of the relationship between ArrayList, List, LinkedList, and Collection in java 1. Basic introduction (Set, List, Map) Set (set): The elements in the set are not ordered in a particular way, and there are no duplicate objects. Some of its implementation classes can sort objects in a collection in a specific way. List (list): The elements in the collection are sorted by index position. There can be duplicate objects, allowing the object to be retrieved according to the index position of the object in the collection. Map: Each element in the collection contains a pair of key objects and value objects. There are no duplicate key objects in the collection, and the value objects can be repeated. Some of its implementation classes can sort key objects in a collection. 2. Basic interfaces and types 1. Iterator interface This interface allows traversing all elements in the collection. There are three methods: public boolean hasNext(): Determine whether there is a next element. public Object next(): Get the next element. Note that the return value is Object and may require type conversion. If there are no more elements available, a NoSuchElementException is thrown. Before using this method, you…
JAVA07Object class, Date class, Calendar class, System class, packaging class, Collection, generics, List, Set, data structure, Collections
1. Overview java.lang.Object class is in the java language The following class is the parent class of all classes. The other class Object is the root class of the class hierarchy. Each class uses Object as its superclass. All objects (including arrays) implement the methods of this class. It contains 11 methods. 1 package cn.itcast.demo01.demo01; 2 3 public class Demo01ToString { 4 public static void main(String[] args) { 5 //The Person class inherits the Object class by default, and you can use the toString method 6 //Create Person object 7 Person person = new Person(“张三”,19); 8 String s = person.toString(); 9 // Directly printing the name of the object is actually calling the toStirng method of the object person = person.toString 10 System.out.println(s);//cn.itcast.demo01.demo01.Person@75412c2f 11 System.out.println(person);//cn.itcast.demo01.demo01.Person@75412c2f 12 } 13 } 14 15 1 package cn.itcast.demo01.demo01; 2 3 public class Person { 4 private String name; //Private member variables 5 private int age;// Private member variable 6 //Add the corresponding construction method 7 8 9 public Person() { 10 } 11 // Directly printing the address value of the object is meaningless, you need to override the toString method 12 13 14 @Override 15 public String toString() { 16 // Return super.toString()…
Implementation of placing arrays in java configuration files_@ConfigurationProperties binding configuration information to Array, List, Map, and Bean…
Related instructions： In SpringBoot，We can obtain and bind the information in the configuration file in the following ways： @Value annotation. Use Environment. @ConfigurationProperties annotation. By implementing the ApplicationListener interface ，registering the listener， for hard-coded acquisition, please refer to：https://www.jb51.net/article/187407. htm Hard coded loading file acquisition. …… Note ： Under normal circumstances, the first and second methods are enough; but if you want to get them directly from the configuration file As for arrays, lists, maps, and objects, the support for the first and second types is not very good. Currently, only arrays, lists, and maps are available. As for beans, I’m a little helpless. At this time we can use the third method to obtain. Environment Description：Windows10, IntelliJ IDEA, SpringBoot 2.1.5.RELEASE @ConfigurationProperties annotation to obtain configuration information and bind to the object example： ; Preparation work：Introducing spring-boot-configuration-processor dependency Give me my complete pom.xml file： xsi:schemaLocation=”http: //maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd”> 4.0.0 org.springframework.boot spring-boot-starter-parent 2.1.5.RELEASE com.aspire.yaml-properties yaml-properties 0.0.1-SNAPSHOT Yaml file and properties file syntax examples yaml file and properties file syntax examples 1.8 org.springframework.boot spring-boot-starter org.projectlombok lombok true org.springframework.boot spring-boot-starter-test test org.springframework.boot spring-boot-configuration-processor org.springframework.boot spring-boot-maven-plugin Load demo. The information in the properties file is bound to the bean， and injected into the container example： Project…
[Java Basics Consolidation Series] Java data collection, List, Map, Set, JUC, everything you need
Popular Series： [Java Basics Consolidation Series] Java Memory Overflow and Memory Leak [Java Basics Consolidation Series] Java class initialization execution sequence [Java Basics Consolidation Series] The most comprehensive technical architecture mind map for advanced Java advancement [Java Basics Consolidation Series] Understanding Java Parental Delegation Mechanism Programming Life，Wonderful Preview Table of contents 1. Preface 2. Collection framework 3 .Set interface 3.1 The difference between Set and List 4. Commonly used collection implementation classes 4.1 ArrayList 4.2 LinkedList 4.3 HashMap 4.4 HashTable 4.5 ConcurrentHashMap 4.6 TreeMap 4.7 HashSet 5 .Five commonly used concurrency packages 5.1 ConcurrentHashMap 5.2 CopyOnWriteArrayList 5.3 CopyOnWriteArraySet 5.4 ArrayBlockingQueue 5.5 LinkedBlockingQueue 6. Summary 1. Preface Data storage includes a variety of data structures. But overall it can be divided into four categories: linear tables, hash trees, and graphs. And our java actually also has its own commonly used “data structure” – that is, collections. But the underlying implementation of collections in Java is also implemented by data structures such as arrays, linked lists, and trees. Below we will give a certain in-depth explanation of some commonly used collections. 2. Collection framework As a Java developer, you must know all the commonly used collections. Let’s use a picture to list…
