Java
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Analysis of Excel instance using POI in Java
This example shares the specific code of Java using POI to operate Excel for your reference. The specific contents are…… -
JSP student information management system
This example shares the source code of JSP student information management system, JSP + servlet + JavaBean + jdbc + MY…… -
Detailed explanation of advanced examples of converting Java objects into JSON objects using gson Library
Common conversion operations for list, map and other structures can basically meet most of our needs, but sometimes th…… -
Simple example code of reading excel from Java Web
Directory structure: Data. Xls data: Background page: Data. java Front page: Index. jsp: Operation results: The above …… -
Example of Java reading excel table documents using Apache POI Library
Apache POI is a free, open source, cross platform Java API written in Java. Apache POI provides Java programs with the…… -
Gson implements JSON serialization and deserialization of Java objects
Download gson from GitHub: https://github.com/google/gson The application of gson mainly includes two conversion funct…… -
On the definition of classes and objects in Java programming
1. What is class? A: classes are objective, abstract and conceptual things. 2. What's the object? A: the object is con…… -
Use the gson library to convert the map key value corresponding structure object in Java into JSON
The storage structure of map is in the form of key / value. Key and value can be ordinary types, JavaBeans written by …… -
Example of Java using dichotomy to find and sort
To realize the dichotomy search, the array needs to be an orderly sequence. The dichotomy search is more efficient tha…… -
Java – slf4j error: class loader has different types of class objects
Try to find out why I received the following error in the Tomcat log: Caused by: java.lang.LinkageError: loader constr…… -
Java – default type of HashMap for K and V
I usually type my map declaration, but I'm doing some maint and finding one without input It reminds me of (oh, no!) W…… -
Java – whether the EJB container resides in all application servers EJB container drill down
I'm new to EJB From all reading and searching from now on, I have learned the following: EJBs are beans that write and…… -
Good looking Java Swing look and feel?
I am developing an open source Java Web start application, and I want to give a consistent theme on the platform Metal…… -
Map API for Java Swing
I want to visualize geographic maps in the swing application I found only the swingx map API Do you know any other ope…… -
Java – spring annotation based controllers do not work in jar files
I have some annotation - based controllers in the sub - module These modules are deployed as jar files The annotation …… -
JavaFX application error: no resource specified
I'm new to JavaFX and I'm trying to run a simple application Its UI is created by JavaFX scene builder, and the main c…… -
Java – how to include jar dependencies in the AAR Library
Summary: I have an AAR file that depends on the jar file. When I build an AAR project, it does not contain jar code De…… -
Different results in Java and C are used in recursion=
The following very simple java code has strange output, but the same logic code in C and C has the correct output I tr…… -
What does Java use to determine whether keys in a map are duplicated?
My first instinct is that every key is an object and has a hash code, which is used to determine whether to insert a d…… -
Java – use joda datetime as the Jersey parameter?
I want to use joda's datetime query parameter in Jersey, but it's not out of the box in Jersey I assume that implement…… -
Java – JSP bean tag for attributes that may not exist
In JSP, I can use tags to reference bean properties Is there a way to deal with attributes that may not exist? I have …… -
Java – modify the final value compiled by JIT
I noticed a very strange thing. After changing the last field through reflection, the method to return the field has a…… -
Java – data structure with bidirectional o (1) lookup Hash table?
I'm implementing a system. I have a list. Everyone has a phone number I need to be able to take a name and find a phon…… -
If you explicitly initialize an object array in Java, the inclusion is different from the new object []?
This question has been asked here, but I especially want to know the specific meaning of the author I read thinking in…… -
Why Java net. Sockssocketimpl is the default Java net. Socket implementation?
The question is simple Why does a socks aware socket implementation implement Abstract Java net. The default choice of…… -
JavaFX – how to create screenshots of snapshot / (invisible) WebView
I want to create a snapshot / screenshot / image in WebView in JavaFX (8) This WebView does not need to be visible (in…… -
Java – can’t contain the same interface as different parameters?
Consider the following example: public class Sand@R_886_2419@ { public interface Listener<T extends JComponent&…… -
Java – subtract 1 hour to datetime using joda time
I just want to subtract 1 hour from datetime. I try to find it on Google. I find a method called minus, which requires…… -
Java – pause the timer and continue
Please refer to the code posted by @ Yuri here How to stop a timer after certain number of times. If I want to stop it…… -
Java: faster alternative to string (byte [])
I am developing a binary data downloader based on Java The data is transmitted via text - based protocol (Uu encoding)…… -
Java – cortlin: why can’t I do a task in the loop guard?
Why is this syntax invalid? The error reported by IntelliJ is that only expressions are allowed in such a context (lin……