Java
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Java 8 extracts the first key from the matching value in the map
Suppose I have a map with a given name and last name pair, and I want to find the given name of the first entry in the…… -
Java ‘prototype’ mode – New vs clone vs class newInstance
In my project, some "prototype" factories create instances by cloning the final private instances The authors of these…… -
Java – Open Source improvement or replacement of swing components
I have developed many desktop Java applications using swing, and swing is very powerful (once you get its suspense). T…… -
Java – failed to start namenode in Hadoop?
I configure Hadoop in Windows 7 from tutorial 16/01/19 15:18:58 WARN namenode. Fseditlog: class not configured for C, …… -
Java – runtime dependency injection and spring
My current project is to use spring, and our architect decided to let spring manage services, repositories and factory…… -
Java – Apache POI uses HSSF much faster than xssf – what’s next?
I use Apache POI to parse There were some problems with xlsx files - I received Java Lang. outofmemoryerror: Java heap…… -
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…… -
How to quickly close unresponsive WebSockets in Java spring Tomcat?
I have a real-time application. The client uses WebSockets to connect to the spring framework server running spring bo…… -
Xdebug does not load Windows 7 64 bit PHP 5.4
I have PHP running on Apache I have downloaded what I think is the correct Xdebug compilation DLL for PHP version 5.4 …… -
Type cast array / vector in rust
What is the usual way to convert an array or vector of one type to another in rust? The desired effect is let x = ~[0 …… -
. Net memory model, variables and test sets: what is guarantee?
I Know. The. Net memory model (in the. Net framework; not compact / micro / Silverlight / mono / XNA / what have you y…… -
Automatic boxing should be avoided in Java
I'd like to ask if automatic boxing should be avoided in Java Because some methods need a primitive type "double", but…… -
Java – the best way to copy from one array to another
When I run the following code, there is no copy - what did I do wrong? In addition, is this the best / most effective …… -
jdbc – JT400. Jar disable login screen
Can someone help me? I have a small utility that uses jt400-6.7 Jar to the AS400 server Refer to the following code pr…… -
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 ……