Recent Posts
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Java – why doesn’t this code throw a NullPointerException?
background I want to know why a piece of code does not throw NullPointerException source code Consider the following c…… -
Does the Java garbage collector stop POSIX threads created from JNI calls?
I have a time critical application that needs to send UDP datagrams according to the set schedule The jitter tolerance…… -
Java – is there any way to provide persistenceunitname for spring’s localcontainerentitymanagerfactorybean instead of using persistence xml？
I have multiple data sources and multiple entitymanagerfactories defined in my spring context If there is only entitym…… -
Why does Java 8 completable future thenpose generate different exceptions according to the completion order?
I have encountered the strange behavior of the Java 8 completable future thenpose method I have two tests that differ …… -
Java – how to programmatically check HTML documents
I have a database containing small HTML documents, and I need to programmatically insert several into PDF documents wi…… -
Jsf-2 – @ predestroy is not called after the session expires
This is in was8 JSF 2 application running on 0 This is the code of a page's "support" bean @Named("mySessionBean") …… -
java – org. testng. Testngexception encountered while trying to access poolinghttpclientconnectionmanager
So I recently faced testngexception when trying to run an existing test suite using the IDE Recently I mean updating I…… -
Copy two 2D arrays to another 2D array
I have another Java question:) I've read the this thread and it clearly explains it, but I have two 2D arrays I want t…… -
JavaFX video cannot be played
I followed some tutorials on playing video by combining JavaFX with swing (JFrame), but all I got was a black screen, …… -
How to use java to know the original size (width and height) of SWF file?
Is there any way to know the original width and height of SWF file in Java? int width,height; // my stream contains a…… -
Java – context hierarchy in spring boot based testing
My spring boot application starts as follows: new SpringApplicationBuilder() .sources(ParentCtxConfig.class) .chil…… -
Java：Math. 32-bit FP implementation of sqrt()
Standard math Sqrt () method seems to be quite fast in Java, but it has an inherent disadvantage that it always involv…… -
In Java, why is the new operator not used to allocate memory before the data type?
If we need the new operator to allocate memory for objects, why don't we use it class-name class-var = new class-name…… -
Java：Math. 32-bit FP implementation of sqrt()
Standard math Sqrt () method seems to be quite fast in Java, but it has an inherent disadvantage that it always involv…… -
How to support multiple truststores in Java SSL client applications
In our Java application, we need to use HTTPS protocol to communicate with the server list on SSL The list of servers …… -
Java – how to programmatically scope beans
I tried to find the scope of the bean by its name What I have found so far is: beanfactory#isPrototype(String name) …… -
Java – did this happen before the program command rules worked in the constructor?
Can you really view partially constructed objects in the thread created in the constructor because of the lack of sync…… -
Drag and drop images in Java
What I want is to drag and drop images from one JPanel to another I can do this by using the DND library But I insist …… -
Drag and drop images in Java
What I want is to drag and drop images from one JPanel to another I can do this by using the DND library But I insist …… -
Java – catch parameter parsing exception in spring 3.0 webmvc
I use spring webmvc to provide rest APIs The way I use is like @Requestmapping ("/ path ({ID}") void getbyid (@ pathva…… -
Convenient functions of operators in Java 8?
In Python, if I want to collapse the XOR operation, I can write: reduce(operator.xor,my_things,0) Not more trouble red…… -
Can JavaFX filechooser “remember” the last directory it opened?
My view controller has a filechooser instance for opening and saving files Every time I call showopendialog () or show…… -
Generic class parameters in Java
So I pass activities and intentions in my Android application to handle threads (I'm sure there's a better example bec…… -
Comprehensive analysis of Android view drawing process
preface In the previous articles, the author described the decorview, measure and layout processes respectively. Next,…… -
Solution of using pull parser to operate XML file in Android
1、 Use the pull parser to read the XML file In addition to parsing XML files using Sax or DOM, you can also parse XML…… -
Android uses intent to realize Notepad function
This example shares the demonstration process of how intent realizes a simple Notepad function for your reference. The…… -
Solution to WebView unable to backoff and JS injection vulnerability in Android
Because the redirection cannot work normally, the goback() solution first talks about the problem. The initial page is…… -
Simple example of Android XML data parsing
1. Create XML data Create a raw folder in the RES / directory of the Android project directory, and create data.xml in…… -
Example explanation of android app using fragment in viewpager
It is said that Android most recommends the use of fragment in viewpager, that is, the pages in viewpager are not load…… -
Complete example of Android application welcome interface based on viewpager
This article describes the application welcome interface of Android based on viewpager. Share with you for your refere…… -
Android imitation Silicon Valley News pull-down refresh / pull-up load more
1. Add and load more layouts 1_ Initialization and hidden code Call in the RefreshListView construction method 2_ Layo…… -
Example analysis of implementation method of listview pull-down refresh in Android
This article describes the implementation method of listview pull-down refresh in Android. Share with you for your ref……