Java
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Multithreading – how to reliably pass a signal to another thread in a pthread?
I tried to write a simple thread pool program in pthread However, it seems that pthread_ cond_ Signal will not block, …… -
The Java – JAXB xmladapter method does not throw an exception
I am using JAXB xmladapter to organize and ungroup Boolean values The application's XML file will also be accessed by …… -
Java – how to suppress multiple findbugs warnings on the same line of code
I recently found findbugs @ edu umd. cs. findbugs. annotations. Suppresswarnings annotation, which is very cool and al…… -
Java – when is it appropriate to use blank final variables?
I'm looking at another question about final variables and notice that you can declare final variables without initiali…… -
Java – does the terminal operation on the stream close the source?
See English answers > do terminal operations close the stream? two Path directory = Paths.get(/* some directory */)…… -
Java – audiorecord object is not initialized in the project
When I try to record audio with my nexus 5 using the following code record = new AudioRecord(MediaRecorder.AudioSource…… -
Java – APK extension file – application license – developer account – not_ Licensed response
I'm trying to use the APK file extension for Android APKExpansionPolicy aep = new APKExpansionPolicy(mContext,new AESO…… -
Java – statet in eclipse and R
I've managed to install statet into eclipse. I have a java project called "test" with some code I hope to be able to T…… -
Using guava and GWT
Someone can tell me what needs to be done to enable guava support in GWT I have downloaded guava R07, where there are …… -
Java streams: grouping lists into maps
How do I use Java streams to do the following? Suppose I have the following classes: class Foo { Bar b; } class B…… -
Java – transform and parse JSON
I'm using retrofit with Jackson For some reason, I cannot resolve the following JSON: [ { "ProfileImage": …… -
Java – log4j is recorded twice in different formats
I don't know why log4j is attached twice in different formats Has anyone met before? This is my log4j XML file: <lo…… -
How to use java to access spreadsheets in open document format (. ODS)?
I want to read, write and create spreadsheets in Java open document format And I want the generated Java program to ru…… -
Java – policy design pattern – select policies and counters
I'm programming in Java, but this is a more design question, so any OO programmer can answer this question I have a qu…… -
We can reject serialized Java objects instead of giving the transient keyword
We can avoid serializing fields by using the transient keyword Solution http://java.sun.com/javase/6/docs/platform/ser…… -
Java – mybatis column mapping
I use mybatis 3.0 3 and there is a problem: some columns in the database have underlined names, which should be mapped…… -
Java – call stream() Reduce () in the list has only one element
I am a new function programmer of Java and want to know how I should write code to avoid NPE (for example): myList.str…… -
What is the best way to transfer files using Java?
I'm writing a code to upload files from the client to my server, and the performance is not as fast as I think I am no…… -
Java – static variables that span multiple different subclasses – corrected
I want to know that if I define a basic activity object, all my activities are subclasses Then I declare a static vari…… -
Java – spring: init method, postconstruct, afterpropertieset: when to use others?
There are many initialization options available in the spring bean lifecycle Init method, postconstruct annotation, af…… -
High end 2D Java (SE) graphics library [closed]
I am looking for a high-end graphics library for Java Standard Edition I know some fairly low-level libraries: AWT / s…… -
Java has about 100 parallel threads and memory management
I am writing an optimization algorithm to create about 100 threads At present, I start them once (for loop), and then …… -
Java – why Maven war plugin failed web XML fails if I configure it without failing in the missing web xml？
This is a challenge: Why did this build fail? I have configured Maven's Maven war plugin, which will not be in a missi…… -
Java – PGP data encryption for yubico OpenPGP smart card
I try to implement PGP encryption in Java applications based on yubikey Neo OpenPGP smart card applet It seems to be a…… -
Java – how to access method properties using spring AOP (AspectJ style)?
I need to accept some methods and their properties by using annotations as pointcuts, but how do I access them I have …… -
Java – find or insert based on Hibernate’s unique key
I'm trying to write a method that will return a hibernate object based on a unique but non - primary key If the entity…… -
The mysterious veil of Java EE 6 annotation inheritance
I use EJB inheritance in several schemes, and sometimes use annotations in superclasses, such as this general entityda…… -
Java – get the instance name of the websphere application server
My web service will run on JBoss app server or websphere application server For both of them, I need to know the insta…… -
Java / scala BigInteger paste
I have a problem with the Java BigInteger class: I can't paste a large value into BigInteger For example, suppose I wa…… -
Java – PGP data encryption for yubico OpenPGP smart card
I try to implement PGP encryption in Java applications based on yubikey Neo OpenPGP smart card applet It seems to be a…… -
What is a good tool for investigating the use of database connections in Java?
What is a good tool for investigating the use of database connections in Java? Developers are supporting a complex Jav…… -
Java – how to map the root directory of URL schema directory in servlet mapping in spring MVC?
<servlet-mapping> <servlet-mapping> <servlet-name>testServlet</servlet-name> <url-p……