Java
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Java – store data in memory
I have "table a" in the database, which contains three columns "col 1", "col 2" and "col 3", with about 1000000 (1 mil…… -
Java – the real advantage of the factory model
I've been using the factory model for a year Sometimes I just think the real advantage is clean code Let me explain, i…… -
Java is equivalent to Matlab’s’ EPS’ or numpy / Python’s’ spacing ‘function (floating point relative precision)
background Matlab's built-in EPS function [1] can take a value x and return "the positive distance from ABS (x) to the…… -
Javaw still creates a console window; Why?
See English answer > start a java program without the console6 java -jar Jython.jar init.py However, when I change …… -
Java swing gridbaglayout panel resizing problem
I'm making a simple little swing application for a relative, but I'm having trouble animating it This is the descripti…… -
Connecting from Java to SQL server using JDBC (Windows authentication mode)
I need to use JDBC 4.0 to connect from Java to SQL Server 2008.0 Class.forName("com.microsoft.sqlserver.jdbc.sqlServer…… -
Java – when to call getpreferredscrollableviewportsize() when laying out JScrollPane?
To implement the scrollable interface, you need to implement the getpreferredscrollableviewportsize () method This usu…… -
Java – use ‘select’ tags and entities in thymeleaf
I am creating a form with a select tag as follows: <form th:object="${version}" method="post" class="form-horizonta…… -
Java – XY position of a certain Z depth
In processing (Java dialect), there are methods screenx, screeny (and screenz, but we'll skip it now) Suppose I have a…… -
Java – hibernate sqlfragment memory leak?
I deployed a simple webapp on the Tomcat server Webapp is a rest web service. Each web resource loads data from MySQL …… -
java – ExecutorService. Submit (callable) returns a null value for the future object
I am using executorservice to generate threads that perform different tasks When submitting the (callable < T >)…… -
Using the dropwizard to process long requests
I have a simple dropwizard service. I want a rest API to start a long-running processing task - including CPU and I / …… -
Java – get interceptor parameters in struts 2
I have the following action mapping <action name="theAction" ...> ... <param name="param1">one</par…… -
Java – try creating with strings
I found an interesting case when I used a string to create and check its hash code In the first case, I use the copy c…… -
Using recursive methods in Java
For homework, I was asked to write an inclusion method for the custom linked list public class OrderedList { private …… -
Java – a technique for extending classes using private constructors
Is there a standard technique to "extend" classes with private constructors, like most singleton classes? Specifically…… -
Java – error: importing com google. appengine. api. Datastore failed to parse JPA gae GWT
Error in development mode [ERROR] [cbd] - Line 15: The import com.google.appengine.api.datastore cannot be resolved Us…… -
Java – the best way to pass objects between classes in different threads?
I have a "runnable" class "a" and I use Java unmarshallers to create new objects The maingui thread attempts to access…… -
Java – read data files into object arrays?
I encountered a problem reading files into an array of objects I created an IF statement to divide the data rows into …… -
Java – streaming video using xuggler
I can successfully play the video with xuggler using the following code I need to be able to stream from InputStream i…… -
Unexpected token using lower bound wildcard (Java)
I have something similar: interface Foo<T> { //... lines [0,45]... /*line 46*/ <R,X super T&R> Li…… -
Java try / catch problem
I'm new to Java. I always encounter problems with the try / catch function in the code, so I wonder if you can help me…… -
Java – use try catch finally to return the type
See English answers > java's return value in try catch finally mechanism4 private Integer getnumber() { Integer…… -
Java – what is the best practice for socket programming – do I turn it off or leave it open every time?
I haven't found a definite answer yet I have a client / server application in Java 7 The server and client are on sepa…… -
Click the selenium Java button
I have a button: <input type="button" onclick="onOpenSessionClick()" value="Open device access"> But when I exec…… -
Java – filechannel ByteBuffer and hashing files
I built a file hash method in Java, which accepts the input string representation of file path and file name, and then…… -
How to determine if another process is using the file (Java)
I tried many examples, but no one worked I also try to use trylock() It always returns false Why? private boolean chec…… -
Java – @ stateless WebService with JPA JTA: how to submit changes to managed entities?
I have the following simple WebService declared as @ freeless EJB in GlassFish 3.1 Run on 2.2, eclipse link 2.4 1. Use…… -
Java – append video files with different widths and heights
I'm building an application where users can record screenshots An integral part of the application is that you can tem…… -
How to connect to gromy’s JMX faster
I use the Weblogic example: http://groovy.codehaus.org/Groovy +And + JMX connects JMX to groovy The problem is that th…… -
Java – joda time days since the era
I have a question, @ L_ 419_ The number of days since epoch returned by 0 @ library changes according to the date I en…… -
Cross platform with asynchronous support Net websocket server Library
Are there any cross platform (read: single friendly) libraries that provide websocket server support and allow asynchr……