Java
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Java Web (VII) JSTL tag library
Previously, we learned that in order not to use scripts on JSP pages, we have built-in behaviors and behaviors in JSP,…… -
Java container
The container collection interface defines methods to access a set of objects, Its sub interfaces set and list respect…… -
The insert method of mybatis plus has the problem of – ID ‘doesn’t have a default value
If this problem occurs, just set the corresponding field annotation to, for example: This error can be solved. -
Java Web (XII) Commons fileUpload upload and download
I have a normal mind today... keep trying.. --WZY 1、 Upload principle and…… -
Detailed explanation of Java Web (V) JSP (four scopes, nine built-in objects, etc.)
We explained the servlet earlier, learned about the inheritance structure and life cycle of the servlet, and learned m…… -
Java Web (XIV) write a summary of mybookstore project
The reason why I haven't posted a blog these days is that I'm writing a small project of the book city as the final pr…… -
Java Web (VI) el expression
This is also the knowledge within the scope of JSP. Using El expressions can make better use of various built-in objec…… -
LinkedHashMap source code details
Preface I didn't intend to talk about map first, but with the understanding of set set, I found that if I don't unders…… -
Java Web (IX) user management system
I learned a lot about JSPS, servlets, JSTL, El, etc. most of them are dead things. As long as I can understand its syn…… -
Hashcode details
Preface I wrote this article because I encountered some hashcode values when reading the HashMap source code, and then…… -
Detailed explanation of reflection mechanism in Java
Preface When learning the basics of Java, I didn't think it was useful because I didn't learn well and didn't speak pr…… -
Lesson 1: Java environment construction
Java environment construction Java features and benefits Three versions of Java JDK、JRE、JVM Install development envi…… -
Markdown syntax details
Markdown learning Markdown Download title Tertiary title Four level title typeface Hello,World! Hello,World! Hello,Wor…… -
Common windows and DOS
Windows common shortcuts Keyboard function keys Tab, shift, Ctrl, alt, space, enter, window, |, ↑↓←→ Keyboard shortcut…… -
Idea creates the first Java program
IDEA Download and install https://www.jetbrains.com Chinese package https://www.jb51.net/softs/598478.html#downintro2 …… -
Implementation principle of LinkedList
This article was written by the author of blog Park: Yicun Hui, personal blog address: https://www.cnblogs.com/zsql/ J…… -
Java object-oriented explanation
#############Java object-oriented explanation ################# 1. Basic object-oriented concepts 2. Classes and objec…… -
Java multithreading and concurrency (Fundamentals)
1、 Process and thread Process: it is a running activity of code on the data set. It is the basic unit for resource al…… -
The difference between throw and throws and the order in which try, catch and finally are executed with return
1、 There are three forms of throwing exceptions. One is throw, the other is throws, and the other is that the system …… -
Four traversals of map
//Four traversal methods of map //Map cannot be traversed directly, but only indirectly by traversing key and value pu…… -
The most user-friendly explanation of the new features of Java 10
Since the beginning of Java 9, Oracle has adjusted the release strategy of the Java version. Instead of a large versio…… -
Still don’t understand the colleague code? Fill in a wave of Java 7 syntax features
preface It has been more than 20 years since the emergence of Java platform. During these 20 years, Java has always be…… -
Introduction to new features of Java 12, come and make up
Java 12 was released as early as March 19, 2019. It is not a long-term support (LTS) version. Before that, we have int…… -
Java learning summary – array creation and parameter transfer
（1） Array creation The creation of array includes two parts: the declaration of array and the allocation of memory s…… -
Find the largest common substring from the two strings
The method to find the largest common substring (comstring) from the two strings (str_1, str_2) is as follows: Example…… -
Java ThreadLocal parsing
brief introduction ThreadLocal is similar to local variables. It solves the problem that a single thread maintains the…… -
Wait / notify mechanism for Java concurrency
1 Preface This article assumes that you have a certain understanding of synchronized and reentrantlock. 1.1 let's rela…… -
Java static keyword explanation
introduction There is a passage in Java programming thought: static method is a method without this. Non static method…… -
Re read the “Java programming ideas” series and other access rights
In Java, we use access modifiers to determine which classes in the library are available to users. Access modifiers in…… -
Principle of single sign on
1、 Single sign on concept 1. What is single sign on Single sign on, referred to as SSO for short, is one of the popul…… -
Why can wait and notify only be in synchronized?
preface Wait and notify must be in the synchronized block, otherwise the illegalmonitorstateexception will be thrown. …… -
Instantly teach you how to use the retainAll method of list in Java
Introduction to retainAll method When we have two list sets, we can use the retainAll method to find the subsets of th……