Java
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Method of reading spring configuration file (spring reads resource file)
1. Spring configuration file -
Conversion between Java and JSON objects
1. JSON lib is a Java class library, which provides the function of converting Java objects, including beans, maps, co…… -
Java uses POI to read ppt files and poi to read excel and word examples
Apache's POI project can be used to process MS office documents, and there is another one on codeplex Net version. POI…… -
Use example of JSON parsing class library of Java
Open source project home page: https://github.com/dongfangshangren/Zson -
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Java implements the tool class of importing data from excel
The tool class for importing Excel data calls only a few lines of code, which is very simple. -
Java button control array to realize calculator interface example sharing
The idea is as follows: Create a class and make it inherit the form class JFrame through extensions; Create a JFrame o…… -
A simple implementation of Java using ternary operators to judge odd and even numbers
Create a class, create a scanner object of the standard input stream in the main method of the class, prompt the user …… -
Java array sorting example (bubble sort, quick sort, Hill sort, select sort)
The quick sort method mainly uses a method in arrays Sort() implementation. Bubble method is to use traversal arrays f…… -
Java file operation tool class to copy files and merge files
Two methods: 1. Copy all files and folders under a directory. 2. Merge all text files under a file directory into the …… -
Implementation of Java design pattern object pool pattern example sharing
Objectpool Abstract parent class -
Java uses JDBC to operate database example sharing
package dao; import java. sql.*; public class BaseDao { //oracle // private static final String Dirver="oracle.jdbc.dr…… -
Java generates and parses instance code for XML format files and strings
1. Basics: there are generally four methods for parsing XML in Java: DOM, sax, JDOM and Dom4j. 2. Introduction to DOM …… -
Java – how to serialize the last class that cannot be serialized by a third party (such as Google’s latlng class)?
I use Google's latlng class in V2 Google play service That particular class is final and does not implement Java io. S…… -
When inserting in a loop, javax persistence. TransactionRequiredException
I have an application using spring, hibernate and JTA We received a request that exceeded the expected data (10000 ele…… -
How to use java code to configure logback and set the log level?
I want to use the default slf4j logback configuration, except for org springframework. data. document. The logging lev…… -
Concurrent use of Java util. Random contention
Oracle Java documentation says: Could it be the reason for poor performance? Solution Internally, Java util. Random ke…… -
Java – parsing JSON using gson, objects sometimes contain lists and sometimes objects
I'm using an API that sometimes contains a list of child objects: { 'obj' : { children: [ {id: "1"},{id: "2"} ] } } I …… -
Java – how to serialize the last class that cannot be serialized by a third party (such as Google’s latlng class)?
I use Google's latlng class in V2 Google play service That particular class is final and does not implement Java io. S…… -
Why does my algorithm become faster after executing several times? (JAVA)
I have a Sudoku solution algorithm, and my goal is to do it as soon as possible To test the algorithm, I run it severa…… -
java. Lang. linkageerror: Loader constraint violation in Grails project
I have built a Grails project with POI (including POI - 3.7 and poi - OOXML - 3.7) I've been working on the buildconfi…… -
What happens when a subclass does not define a constructor in Java?
I have a few things I want to know First, if you don't have a constructor: class NoCons { int x; } When I do the new n…… -
Java – Delphi concurrent memory model?
Is there anything like Java Memory Model in Delphi? To prevent misunderstanding: I mean nothing like "big / big / smal…… -
Java – should I use drools in this case?
I will use the university library system to explain my use cases Students register in the library system and provide t…… -
java – Kryo crash EnvironmentFailureException
I tried to serialize some custom class objects, and I got the following exception: com.esotericsoftware.kryo.KryoExcep…… -
What is the difference between a Java compile time library and a runtime library?
What is the use of professionals? I'm actually in NetBeans' Project Properties > java application library We have t…… -
Java – xmleventwriter: how can I tell it to write empty elements?
I'm in javax xml. stream. Xmleventwriter or javax xml. stream. There is no option in xmloutputfactory. You can set a m…… -
Java – remove duplicate code
I'm creating a small function programming library for Java (just to scratch my own itch) When defining high order func…… -
Why call the printing method of Java printable multiple times with the same page number?
From sun's documentation The printing system may require that the page be rendered multiple times before going to the …… -
Java – hibernate saveorupdate() attempts to save when it should be updated
I have a hibernate entity named issueparticipant It basically describes the relationship between users and problems (s…… -
Aws sdk for java,dynamo db mapper async
In Amazon Web Services SDK for Java, it is possible to create two different clients for dynamodb: sync and async You c…… -
Java – what is the minimum UNIX permission to run an executable jar file?
If I have a jar, I need to use Java - jar foo Jar runs on UNIX. Does this depend on the read, write, or execute bits? ……