Java
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Java – how to access managed beans and session beans from servlets
See the English answer > get JSF managed bean by name in any servlet related Class6 <p:dataTable value="#{myBean…… -
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Multithreading – why is the compareandswap instruction considered expensive?
Why is the compareandswap instruction considered expensive? I read a Book: "Memory impairment is expensive, like the e…… -
Java – how to easily submit neon using git in eclipse
I just upgraded from Mars to eclipse neon Previously, I could select submit from the team menu, and the dialog box wil…… -
Are there constants for language code in Java or Java libraries?
Do language codes in Java or Java libraries (such as "en" or "de") have constants? (or use string OK?) I know such thi…… -
Test whether the font is first-class in Java
I'm listing all the constant width fonts available on the user's machine I can get all fonts in swing in the following…… -
How to view the status of check boxes in the Java GUI?
I have about 200 check boxes in the Java GUI Now I want to list all the checkboxes that the user has checked I can do …… -
Memory – multithreaded heap management
In C / C + +, I can allocate memory in one thread and delete it in another thread However, as long as someone requests…… -
Java – automatically call superclass methods
Consider class class A{ public void init(){ //do this first; } public void atEnd()…… -
Java – distinguish between string args [] and string [] args
I've seen two different ways to declare a string array, but I don't show any difference Anyone can explain the differe…… -
Java – use interface classes as keys to get specific instance values?
I have the following test cases and can't retrieve values from the map: package tests; import java.util.HashMap; impo…… -
Create repeated timer reminders in Java
I want a class that changes its private variables every 2 seconds I know if I do something import java.util.Timer; //.…… -
What is the correct action to take when closing a window in Java / swing?
I wrote this test code in my customuipanel class: public static void main(String[] args) { final JDialog dialog = …… -
How to initialize dynamic arrays in Java?
If I have a class that needs to return a string array of variable dimensions (and the dimension can only be determined…… -
Java – “package should contain content type part [m1.13]”
I tried to write to an excel file, but I kept getting an error: According to my understanding, I missed a jar file Any…… -
Java – thread / handler error – the specified message queue synchronization barrier flag has not been published
I received this error – As a relative newcomer to Java / Android, there is no doubt that I missed something, but what …… -
JavaFX IllegalStateException when processing jfxpanel in swing
I just came across something strange about JavaFX and swing When processing a JavaFX panel that has been added to a JF…… -
Java – how to populate with a list?
I have a list < string > in the controller I pass to the view I need to fill in < form: Select > with thes…… -
Using classpathxmlapplicationcontext in a stand-alone Java class
I haven't touched spring yet I saw the following code in a separate java project in my system You can help me understa…… -
Spring – JPA and Dao – what is the standard approach?
I am developing my first application using JPA / Hibernate and spring My first attempt in Dao class looked like this: …… -
Java – why do anonymous classes access non final class members of closed classes
We know that the final local variables can only be accessed in anonymous classes. Here is a good reason: Why are only …… -
rx-java – RxSwift – . subscribe vs . What’s the difference between subscribenext?
What is the difference between these two operators? http://reactivex.io Don't mention it subscribeNext. Solution In rx…… -
Java – PDF file download using BlockingQueue
I'm trying to download a PDF file using urlconnection Here is how I set up the connection object URL serverUrl = new U…… -
Can you help me collect the online material collection of Java best practices?
I work in a medium-sized development team and maintain a web application written in Java 1.4 for 8 years For new devel…… -
How to instantiate the Java Boolean wrapper class?
In Java, I can write code like this Boolean b = true ; It will work. I now have an object with a value of "true" How d…… -
Java generic parameters are scoped to any type
Is there a syntax or solution to restrict generic type parameters to any type? I know you can limit types to all types…… -
Delete the first element of stream in Java 8
I have used java Files in NiO library The walk () method generates a stream in Java 8 The problem is that the method c…… -
Why does my java custom cell renderer not highlight when rows / cells are selected?
I have a custom cell renderer to wrap cells with words, so more content can be read This is the code: import java.awt.…… -
Java – why HashSet RemoveAll requires secondary operations?
I have this code to generate a HashSet and call removeall() I made a Class A, which is just an int wrapper. It records…… -
Java heap analysis and OQL: counting unique strings
I do memory analysis on the existing Java software There is an SQL 'group by' equivalent in OQL to view the count of o…… -
Java InputStream. Read (byte [], int, int) method, how to block until the exact number of bytes is read
I am writing a simple client / server network application to send and receive fixed size messages through TCP sockets …… -
Java saxparser: different from ‘localname’ and ‘QName’`
In Java, the handler class contains a method named startelement The this method has a prototype: Public void startelem……