Java
-
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…… -
Detailed explanation of memory leakage in Java
A key advantage of the Java language is its memory management mechanism. You just create objects, and Java's garbage c…… -
Method example of converting Java’s list structure to JSON through gson Library
I found Google's gson. Because I knew something about protocol buf before, I began to use gson with some curiosity. Gi…… -
On the processing operation of JSON format in Java background
1. Convert the object into a JSON string, and the return value is a JSON string 2. Convert JSON string to entity objec…… -
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…… -
Java – sets the number of lines to display for multiline text in SWT
I am using the following for textarea ToolBar bar = new ToolBar(@R_532_2419@,SWT.NONE); ToolItem item = new ToolItem(b…… -
Java – how to set environment variables through tasks?
I have a graduation application My main graduation document includes some tasks (groovy) Solution As far as I know, yo……