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Java access control
Java provides four access rights: Public > protected > package access rights (no keywords) > private Packages…… -
Original Java shell
If you have been exposed to Windows operating system, you should have a certain understanding of CMD in windows. If yo…… -
Cannot create PoolableConnectionFactory (Communications link failure)–Connection refused: connect
I encountered such an exception when I was working on a web project today: I know there was an error connecting to the…… -
File upload principle_ Sorting + summary
File upload is a problem we often encounter. The form has a) attribute, For information about the form, please refer t…… -
Java RMI overview
The advantage of RMI is that you don't have to write network or I / O code yourself. A client program invoking a remot…… -
Java multithreading series_ Create a thread using the runnable interface (3)
A class implementing the runnable interface must use an instance of the thread class to create a thread. Creating a th…… -
Using code to automatically generate packages in eclipse_ This function is very useful_ Java version
I did an experiment before, that is, I used code to automatically create a new package in eclipse, which was not imple…… -
Maven’s first applet
Here is the first applet about Maven About Maven installation: First look at the directory structure: This is the orig…… -
Hadoop 2-mapreduce details
This article is about Hadoop 2 MapReduce version 2.0 will be explained in detail. Please pay attention to the version,…… -
Shift operators in Java: <, > >, > > > summary
There are three shift operators in Java < <: shift left operator, Num < < 1, equivalent to num multiplied …… -
Maven with Multi-module
Well,A project made of multi modules. For example,the hongten-security project,the structure of the hongten-security p…… -
A demo tells you the power of the optimization algorithm
The demo here is an accumulation algorithm, such as 1,2,3,4 n That is: sum = 1 + 2 + 3 + 4+ n; We can do this: Another…… -
Query on “minimizing repeated calculation of variables in the for loop”
In the following article: Described in '': Operation effect: a. b. c. d. Summary: a lot of data has been tested, indic…… -
Hibernate learning notes 2
Hibernate mapping One to many, one to one, many to many One to many mapping Common attributes of the set element …… -
“Goto” — label in Java
There is no goto in Java, but goto is a reserved word. For example, int goto; It's illegal. However, there are tags in…… -
Generating XML files using java
《 XML in the eyes of Java -- File Writing There are four ways to generate an XML file in Java. 1. Generate XML docum…… -
Is the result of adding char type and int type in Java char type or int type?
At first glance, you may have a question: can these two add up? The answer is to see the effect: Seeing this operation…… -
Apache’s open source project – template engine (velocity)_ I started after two days of study_ Source download
First of all, if you don't know much about velocity, I suggest you go to the official Apache website This is the offic…… -
Excel to HTML
Project structure: This is a maven project. The main function is in the client class After running the program, the co…… -
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Java development_ Get database table description in MySQL_ Source download
In the MySQL database, there are two tables: ,test_ table We need to get the description information of table: and the…… -
Java Web Development_ Multi take / Taobao shopping cart selection
Look at the title. I think you will feel a little confused. Don't panic. Let's take a look at some examples first. It …… -
A pen test question
Today, I went to an interview with a foreign-funded company and encountered a test question The topic is as follows: H…… -
Java development_ Eclipse is exported as a war file and hot deployed to Tomcat to run the summary
In MyEclipse, we can easily do this step: generate a war file from a web project In fact, in eclipse, it is also very …… -
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Java Web – Filters
《 Application of Java Web development technology - filter < p class =" best text mb-10 "> a filter is a program…… -
Java’s POI technology to read and import Excel
< div class = "cnblogs_highlighter" > project structure: -
Abnormal operation
< p align = "center" > abnormal operation < p class = "1" > I. fill in the blanks 2、 Multiple choice ques…… -
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Summary of JS detailed knowledge points 1. Ecmasctipt syntax 1.1 syntax introduction: JS code cannot be written direct……