Java
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Java – jtextarea contains only numbers, but negative values are allowed
I have a jtextarea, just accept numbers This is my code: DocumentFilter onlyNumberFilter = new AxisJTextFilter(); …… -
How to create a class by name defined in the type field of a generic class
I want to use Java generics to implement such functions: public class Test<T> { public T data; public t…… -
Java – when should I use multiple instances of Solr?
I need to index three completely unrelated elements (such as product, blog post, location) Solution If you have three …… -
Java – gets the case sensitive name of the file, not case sensitive spelling
I am creating an application from which users can select files: FilePicker. Pickfile (file name) Where filename is a s…… -
Java – how to get the line number in the @ init action of antlr3 tree parser
In ANTLR version 3, how to obtain the line number in the @ init operation of the advanced tree parser rule? For exampl…… -
Java – M2e still provides the error that “plug-in execution is not overridden by lifecycle configuration”, even if explicit binding is used in custom plug-ins
I'm building a plug - in for code generation I have followed the steps here to learn how to create a plug-in: http://m…… -
How to develop producer consumer like applications in Java?
I have to develop an application similar to the producer - consumer problem in Java But I don't know much about Java. …… -
Java – create variables in advance to use (?) in the loop
Which of the two is more "effective": for (int i = 0; i < 10; i++) { int x = i * 2; } Or – int x; for (int i = …… -
How to determine the number of fields set on an object in Java
I'm not sure if I can do this, but I say I have this object: public class SomeObject { private String field1; …… -
java – Android; Declare EditText in the class body (in any method)
I have programming language experience, but I'm a little new to Android programming I have a program that contains fie…… -
java – play framework Exception – field .. No default value
Running my play framework applet, I get the following exception: Error play spit out in browser I have 2 physical mail…… -
Java – stop all AWT / swing threads and monitors and things so that only the main thread is left
I have the following public static void main(String[] args) { boolean running = true; boolean foo= false; …… -
Is java – atomicinteger implemented based on JNI?
Soneone told me that atomicinteger is implemented using JNI, so it is much faster than synchronization It's true? Solu…… -
Lucene in Java, C # Net and C. which is the best version for long-term use on Windows Servers?
I will implement Lucene search into my project. I want to make the best start 1、 Performance 2 Easy to implement 3 Ma…… -
How do I display menus and panels in the same window of Java swing?
I have a JMenu. I want to change the contents of the window according to the buttons in the menu I try to display the …… -
Java – limits the size of the jtextarea to the size of its text
I have a fixed size (300 x 33) jtextarea with line feed enabled. I have added it to JPanel Whenever you type in it and…… -
Java should not be encouraged net. Httpurlconnection, because org apache. http. client. Is httpclient better?
I still see people using httpurlconnection to communicate with websites The forum also has many issues related to http…… -
Java – repaint swing JComponent after interval
I was assigned a project and I had to use the Gregorian calendar object in Java to make an analog clock First, we are …… -
Java – selenium 2 webdriver cannot find the link
I saw other problems about similar / same problems, but they didn't help me solve the problem: (. I logged in to the p…… -
How to get a clojure handle on a Java static method, similar to_ memfn_ Methods for Java instances?
To handle the Java instance methods that we can call later, we can call the memfn function: user=> (def g (memfn In…… -
Java – managing state in restful based applications
We are evaluating technologies for Web - based applications, and some suggestions are to adopt a restful service appro…… -
Data loss in file transfer – Java?
I have a fileserver and a fileclient. The server sends files when the client connects This is a simple program, just t…… -
Java – how do I move entities to X and y?
I'm looking for a way to move my entity (bullet) to X and y, which is the player's position when the bullet is fired S…… -
java – DiscriminatorFormula
If I have a table and I need multiple columns as discriminators, my only solution is to use @ discriminatorformula? I …… -
Why does the compiler generate enums in Java?
I really understand that it cannot extend any class to implement enumeration, because it means multiple inheritance Bu…… -
How do I listen to changes in vertex selection in Jung 2?
How do I listen to changes in vertex selection in Jung 2? I've been trying to use propertychangelister and changeliste…… -
Java – invocationtargetexception: the plug-in (bundle) “org. Datanucleus” has been registered
I'm trying to follow dataoucleus tutorial for JDO I'm using maven, and I've followed the enhancer instructions provide…… -
Java – spring: how to initialize bean a after bean B is loaded?
I have a beana whose constructor requires beanb Is there a way to do this? Another way is to call BeanB. after all bea…… -
Java – JTable and custom tablemodel
I try to implement a JTable on the Java GUI, which can fill in the values in the file and allow the user to modify eac…… -
Java colored character GUI
I'm making a GUI dictionary program and need to highlight letters in each displayed word I want to know how to do this…… -
Java UDP sockets – data left behind on the server side
I'm using UDP sockets to implement a very basic server - client model in Java, and I encountered a very strange proble…… -
Java: string length when displaying square root using Unicode outline?
In Java, I created a string using Unicode and outline because I tried to display the square root of the number I need ……