包含标签：Java 的文章
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Avoid implementing methods in interfaces – Java
I have the following interface: public interface a { public void m1(); public void m2(); public void m3();…… -
How do you use CouchDB change notifications to make continuous changes from Java?
I'm trying to use CouchDB (continuous) change API in Java and find that after exhausting the current change list, the …… -
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……