Java
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Java generics and return types
I've just come across something I don't understand Why is every loop illegal when the second is the same? public inter…… -
Is there a Java geometry library? (not JTS)
I want to be equivalent to CGAL (c) – I want convex partitions of polygons or at least triangulation It must also be f…… -
Java – how to solve ‘define and throw special exceptions instead of using general exceptions.’
When the length of the two lists is not equal, I need to throw runtimeException We use the sonarqube tool for code rev…… -
Java – Proguard does not obscure jar dependencies
I have a project with POM given below XML file When I issue the command MVN clean compile assembly: single install, I …… -
Java – simulate a spring validator when unit testing the controller
When coding the unit test postmortem into the code created by another project, I encountered the problem of how to use…… -
Java – how to identify whether a string contains special characters that cannot be stored using utf8-mb4 character sets
Please refer to this tweet and the thread below. We are trying to store similar tweets to the database I can't store t…… -
Java – use huge memory in notifications
I am developing a service application that displays the progress of the timer in the notification area (with progress …… -
What is the difference between const and volatile pointers?
What is the difference between const and volatile pointers? Solution The difference really comes down to the differenc…… -
Java – optimistic cache concurrent design pattern
I have a web service running on a set of servers The network service performs some internal processing, and then you c…… -
Java – relative to the current date in the Dbunit dataset
I wonder if there is any way to specify, for example, tomorrow as the date in the Dbunit XML dataset Sometimes the cod…… -
Java – how to convert jsonobject to gson JsonObject？
I have an org json. Jsonobject object Create gson. From What is the simplest method of jsonobject object? thank you So…… -
How to set the default file name of swing Jfilechooser?
I want to set the default file name to untitled. In this Jfilechooser text box txt. Can I set it? Solution Use the fol…… -
Java – unit testing using Apache Mina as an emulated / in memory SFTP server
I'm working on how to use Apache Mina Their documents are a little inadequate for my powerless brain I've seen useful …… -
Code snippet for creating a file from the contents of a blob in Java
I have some files stored in the blob column of the database in Oracle 9 I want to store those files in the file system…… -
Java: datainputstream replaced with byte order
The following is my code to replace datainputstream to wrap an InputStream, but in addition to the common method of re…… -
Java – hibernate criteria: different entities and then restrictions
I have a standard to return all the data required by the application, basically: Criteria criteria = session.createCri…… -
Why does this exceed the 65535 byte limit in Java constructors and static initializers?
Disclaimer: I realize that I can generate this at Java runtime. When testing some code, I need a very special case I f…… -
How to parse large (50 GB) XML files in Java
At present, I try to use a Sax parser, but about 3 / 4 through the file, it is completely frozen, I have tried to allo…… -
Java – why doesn’t Maven generate project reports?
This is Maven 3.0 I am creating a new project: mvn archetype:create Then I create a file site / site xml： <project…… -
Java – converts a byte array containing ASCII characters to a string
I have a byte array consisting of ASCII characters that I want to convert to a string For example: byte[] myByteArray …… -
Java – how to improve my JUnit test
My JUnit test looks like a long story: >I create 4 users > I delete 1 user > I try to log in with the deleted…… -
Java – use GlassFish / Metro to simulate the problem of WCF secure web server
I'm trying to build a GlassFish hosted web service (for development and testing) and a WCF hosted web service I have t…… -
Java string pool and type conversion
My problem is the way Java handles strings It is clear from the Java language specification (JLS) that string literals…… -
Java – even with wrapper classes, swingworker exceptions are lost
I have been trying to solve the usability problem of swingworker. It will throw any exception in the background task, …… -
Packaged Java applications run faster in Windows XP compatibility mode
According to some of my customers, Java applications run faster in Windows XP compatibility mode of Windows 7, but why…… -
Java – BlackBerry browser return Click
After loading the browser, I want to go back to the previous page, but it takes three clicks I tried to override the b…… -
Java – how to implement batch processing using mybatis / spring?
I want to know how to use mybatis 3& amp; Spring 3? For example, this is what is being done now: spring. xml： <…… -
Java – AbstractFactory and bridge mode
I just learned bridge pattern and its intention: remove an abstraction from the implementation so that the two can cha…… -
Java – migrate to Tomcat 8: instancealreadyexistsexception data source
I have a question about the context configuration in Tomcat 8 I migrated the project from Tomcat 7 to Tomcat 8, and th…… -
Java – nullpointer exception in LinkedList when using for each loop
I encountered very strange Java behavior. I don't know whether it is a bug or not The code simply passes through the s…… -
Create a unique timestamp in Java
I need to create a timestamp (in milliseconds) in Java that is guaranteed to be unique in this particular VM instance …… -
Java – if called in the synchronization method, thread. Will yield() lose the lock of the object?
I understand thread currentThread(). Yield () is a notification thread scheduler that can assign CPU loops to other th……