Java
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Factory method pattern for Java design pattern learning
Factory method: define an interface for creating objects, and let subclasses decide which class to instantiate. Factor…… -
The Jackson entity turns JSON to null or empty and does not participate in serialization (example explanation)
When using Jackson for serialization, we often encounter that the attribute of an entity object in the background is n…… -
Explain in detail how JSTL in Java Web circulates map data in list
Explain in detail how JSTL in Java Web circulates map data in list The first way: 1: Background code (test) 2: Front p…… -
Java implementation of two-dimensional array to JSON method example
This paper describes the method of converting two-dimensional array to JSON in Java. Share with you for your reference…… -
Java implementation of web page verification code function
This example shares the implementation code of Java Web page verification code for your reference. The specific conten…… -
Futuretask source code analysis (recommended)
Futuretask only implements the runnablefuture interface: @ h_ 404_ 1@ This interface inherits Java Lang. runnable and …… -
Java thread safe counter simple implementation code example
In the past few days, a business code needs a variable to increase from 1 every day. To this end, I simply encapsulate…… -
Influence of synchronized method on non synchronized method
StringBuilder is a thread unsafe class. StringBuffer is thread safe because its methods are synchronized. Today, I wro…… -
Simple definition and usage example of Java two-dimensional array
This article describes the simple definition and use of Java two-dimensional array. Share with you for your reference,…… -
Loading order and execution results of classes in Java
The specific code is as follows: Execution results: Static method of parent class 2 static initialization block subcla…… -
Struts 2 interceptor about solving login problems
The working principle of the interceptor is shown in the figure. Each action request is wrapped in a series of interce…… -
Java programming uses stack to solve the code example of Hanoi Tower problem (non recursive)
[title] The tower of Hanoi is a classic problem. Here is a modification of the rules of the game: now the restrictions…… -
Example of Java output printing tool class encapsulation
When you print out Java and view the field value, you feel that you have written system. Net every time out. After pri…… -
Struts 2 configuration XML action details
When learning struts, we must master the working principle of struts 2. Only when we specify the implementation proces…… -
Detailed explanation of calendar class usage examples in Java
This article describes the usage of calendar class in Java. Share with you for your reference, as follows: Calendar in…… -
Explain the reflection mechanism in Java (including array parameters)
Explain the reflection mechanism in Java (including array parameters) Java reflection is what I always like very much,…… -
Java date time and date conversion
Java date, time, and mutual conversion for your reference. The specific contents are as follows The above is the whole…… -
Java to find the large number of two numbers (example explanation)
Max function in Java in math The application is as follows: int a=34； int b=45； int ans=Math. max(34,45); Then the v…… -
Java toString method rewrite code example
When you need to output an object to the display, you usually call his toString () method to convert the content of th…… -
Common problems based on Multithreading concurrency (detailed explanation)
I. overview 1.volatile Ensure that once the shared data is modified, it will be synchronized to the shared memory (hea…… -
Implementation code of readwritelock read-write separation of Java multithreading
In multithreaded development, there is often a situation where we want to separate reading and writing. For the read a…… -
Use recursion to delete all child nodes of the tree structure (Java and MySQL Implementation)
1. Business scenario It has the following tree structure: + - 0 + - 1 + - 2 + - 4 + - 5 + - 3 If you delete a parent n…… -
Explain in detail the spring boot + mybatis + freemaker framework built in MyEclipse
1. Create a maven project in MyEclipse. File>New>Maven Project： Check the red part in the figure and click next…… -
Example of httpclient implementation calling external project interface tool class
Examples are as follows: The above example of httpclient calling external project interface tool class is all the cont…… -
Java code for connecting to MySQL database
This example shares the specific code of Java connecting to MySQL database for your reference. The specific contents a…… -
Switching of multiple data sources in Java automated testing (example explanation)
Data driven is a very important concept in automated testing. When the data is separated from the script, in the face …… -
On the advanced usage of JUnit 4 unit testing
JUnit unit test framework is a necessary test tool for Java program development. Now JUnit 4 is the most commonly used…… -
Use of httpclient in HTTP protocol interface test (detailed explanation)
In the interface test of HTTP protocol, get request and post request are most used. The post request includes form par…… -
Detailed explanation of Shiro session expiration time in spring boot actual combat tutorial
preface As we all know, in spring boot, setting the session expiration time only needs to be in application Add server…… -
java. Lang. void class source code analysis
When viewing the ThreadGroup in the source code, I see a piece of code, which is as follows: This method is used to ch…… -
Java quicksort (instance)
Quick sort ---------------------------------------------------------------------- thought As shown in the figure above…… -
Detailed explanation of Java synchronization function code
summary The lock of the synchronization function is this, and the lock of the static synchronization function is the b……