Java
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How to perform different operations in update() of observer in Java?
I just started using observable, observer and its update () method. When different actions call notifyobservers (), I …… -
Java – static initializer and instance initializer and constructor
There is already an answer to this question: > use of initializers vs constructors in java8 Solution The main diffe…… -
Consider storing serialized Java objects as Cassandra as JSON What is catch?
I'm using Cassandra 1.2 2. I find it easy to use Jackson to map my objects and store JSON and Java in the database I'm…… -
Java – unable to publish ear to WebSphere
I am running rational application developer for WebSphere software (v.8.0.4.1) on windows I have an ear project and I …… -
Get the real file extension – Java code
For security reasons, I want to determine the real file extension How can I do this? Solution If you really want to ge…… -
JAVA_ Home is not defined correctly (only from Jenkins)
Tried to set Jenkins, but my build failed: $ant test Error: JAVA_HOME is not defined correctly. We cannot execute /u…… -
Java – Maven jetty plug-in daemon elements are not allowed here
I'm trying to configure the project's POM XML file I want it to start the jetty server during the test phase To do thi…… -
Java – post a set of custom objects to struts 2 actions
How to publish a set of custom objects to struts 2 operations in Java? For example, if I have the following Java objec…… -
Java – I’m confused about writing a program to place some modified large parts on the 8 x 8 board
For this question: I want to write a powerful algorithm to find the maximum This is what I wrote: public class Main { …… -
JSF. Load and invoke supported bean methods on each page
See the English answer > invoke JSF managed bean action on page load4 I have pages with datasheets and several bean…… -
Java – spring data: can I include subqueries in query annotations?
I wonder if subqueries (org. Springframework. Data. JPA. Repository. Query;) can be used in the @ query annotation I g…… -
java – OpenCV 2.4. 1：UnsatisfiedLinkError
I have an Android project with native code In this native section, I use OpenCV It compiles without any errors, but wh…… -
Java – how to inject beans using EJB 3.1 before the class constructor runs?
I have a facade with persistence units I need the facade and initialize its dependencies before the rolecontroller con…… -
Java – beannotofrequiredtypeexception, but it is actually a $proxy type
I need help with spring and proxy issues Webapp project – > Spring context <context:annotation-config/> <c…… -
Java – MapReduce job without mapper
This may be a very basic question, but it is still helpful for many novices like me Can I do Mr work without a mapper?…… -
Unit test – when the result type is tile, the unit test fails
I tried to test my action class with the JUnit plug - in This action is as follows: @Action(value = "default",results …… -
Is JavaFX the choice of a dynamic GUI for a desktop or stand-alone application?
I want to make a dynamic UI for desktop applications I'm going to create it in JavaFX The second thing I want to know …… -
java – inputstream. Available() is always 0
I don't know what happened to my code I made no mistakes and did not respond I'm writing data to serialport and activa…… -
In Java / Apache httpclient, you cannot use vertical / pipe bars to process URLs
If I want to handle this URL, for example: post = new HttpPost("http://testurl.com/lists/lprocess?action=LoadList|4018…… -
Java – resolve “duplicate definition of library class” in Proguard
I have a java project that contains the Xerces library When I process a project with Proguard, I receive a warning: No…… -
Java – create volley requests in different threads
I want to use the volley Library in different threads for requests This means that there is a connection in the data p…… -
Java – valueeventlistener childeventlistener for recyclerview in Android
Firebase database users know that there are two basic listeners for listening to data: valueeventlistener and childeve…… -
java – Calendar. What does undecimber do?
The calendar class has a constant named undefcimber It describes the 13th month Is this constant useful? In Wikipedia,…… -
Java – Android UI element animation
I'm trying to animate UI elements I want to move an EditText and a button from the middle of the screen and display th…… -
Java – trim struts 2 text string input
What is the best way to trim this string? Where is the best place to place the trim code? Suppose my JSP has the follo…… -
Java – how to export all my IntelliJ code styles to Editorconfig file?
I tried to develop a standard code style for my project, and I've found it http://editorconfig.org/ , this is a standa…… -
Java – preconditions library throws illegalargumentexception for notnull check
Do you know that Apache commons validate or guava preconditions is a good alternative. When checking whether the objec…… -
Java EE – how to instantiate multiple CDI / weld beans for a class?
In spring, you can instantiate any class by defining the corresponding bean in XML conf You can also instantiate multi…… -
Java – create a runnable jar that contains external files
I want to build a running jar. Jar in Java I need to include some files in the jar so that when I execute the jar, the…… -
Java commons cli with options for a list of possible values
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