Java
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Analysis of HashMap usage from the perspective of Java source code
―HashMap― Advantages: super fast query speed and time complexity can reach o (1). The data structure is HashMap. Dynam…… -
Simple implementation of Java upload image file function
Generally speaking, there are two ways to upload pictures. One is to write picture files to the database, and the othe…… -
Photo album management system (Java form + XML database storage)
Upload, download and management technology of functional files: 1 Using XML as a database to store information (Dom4j,…… -
Pinyin word segmentation using Pinyin 4J
Use Maven to import related jars Create pinyin4jutil The above method of Pinyin word segmentation using pinyin4j is al…… -
Java object stream instance code
The date object and vector object are written to a file, then read from the file and output to the screen Object input…… -
Java uses es query example code
As we all know, elastic search is short for ES, which is a Lucene based search server. It provides a distributed multi…… -
Explain the construction of restful API of spring boot in detail
The previous article explained how to access the database through the integration of spring boot with jdbctemplate, JP…… -
Spring boot actual database operation example code
In the previous article, I explained the basic principle and use of spring boot through a simple HelloWorld program. T…… -
C language student achievement management system
Design a student achievement management system to realize the dynamic management of student achievement, and realize t…… -
Method for realizing reverse order output of words in English sentences by Java
This paper gives an example of how Java can output words in reverse order in English sentences. Share with you for you…… -
Java thread dump analysis tool jstack parsing and usage scenario
Jstack is used to print out the Java stack information of a given java process ID or core file or remote debugging ser…… -
Example of encapsulated class code in Java language
In the object-oriented programming method, encapsulation refers to a method of packaging and hiding the implementation…… -
IO stream parsing and code examples in Java
IO stream There are two types of IO streams in Java: byte stream and character stream. As the name suggests, byte stre…… -
Analysis of differences between HashSet and TreeSet
I problem 1. How HashSet and TreeSet use hashcode() and equal() methods 2. When and why should the objects in treemap …… -
Java uploads excel content to MySQL instance code
MySQL table column name num1, num2, Num3, num4, num5, num6 table name Excel Upload method Testentity is the entity cla…… -
String. In Java Function example and source code of trim() function
Function of trim(): remove the spaces at the beginning and end of the string. Execution results: a: hello world,false …… -
Java introspection instance parsing
The number of contours in the image. The size of the vector represents the number of points on the contour. Understand…… -
Specific methods of using java to operate elasticsearch
System environment: CentOS 7.2 under vm12 Current installed version: elasticsearch-2.4 0.tar. gz Java operation es clu…… -
The establishment of binary tree and various traversal example codes in Java
This is a common interview question. For example, through the preorder and middle order traversal of binary tree, we c…… -
Method of realizing online number monitoring function based on java servlet listener
This paper describes the method of realizing the function of online number monitoring based on java servlet listener. …… -
Complete example of 2048 game implemented in Java
This paper describes the 2048 game implemented in Java. Share with you for your reference, as follows: Let's see the o…… -
Examples of matrix addition, subtraction, multiplication, division and transformation in Java
This paper describes the implementation of matrix addition, subtraction, multiplication, division and transformation i…… -
Configuration method of spring boot integrated Shiro
Spring boot provides a built-in authentication framework and a custom javaconfig configuration extension. Spring secur…… -
Java code implementation of wechat hop by hop
The circle of friends has made a jump for a long time. Today, I accidentally saw a video of a former colleague chick d…… -
Introduction to the differences between Java sets and arrays and examples of mutual conversion
Differences between arrays and Collections: (1) Arrays are fixed in size, and the same array can only store data of th…… -
Based on elasticsearch5 4. Summary of frequently asked questions
Elasticsearch5 has been used in recent projects 4 (ES) is a relatively new version. There are many problems in the use…… -
How to install elasticsearch under windows (Graphic)
ES is a Lucene based distributed full-text search server, Similar to the full text index of SQL server, both are full-…… -
Java wechat hop operation guide
Java wechat jump operation guide, which refers to which to choose. The idea of this paper is to control the operation …… -
On sleuth service link tracking in spring cloud
This article focuses on the service tracking component Zipkin. Spring cloud sleuth integrates the Zipkin component. 1…… -
Java sorting method according to the attributes of objects in the list
Method 1: implement the comparator interface and rewrite the compare method @ H_ 404_ 4@ Entity class code: Test class…… -
Java polymorphic instance code
Polymorphism is the ability of the same behavior to have multiple different forms or forms. Polymorphism is the same i…… -
Java parsing word to get the picture position in the document
Preface (background introduction): Apache POI is the next open source project of the Apache foundation. It is used to ……