Recent Posts
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Varargs performance of Java
Let me check the vararg performance of Java I write the following test code: public class T { public static void …… -
Java – interoperability between graphics2d and graphicscontext
I'm working with a combination looking for a graphics renderer in Java At present, I am trying to determine the target…… -
How garbage collection is done in Java is related to Net?
I want to know the difference between the two, or they are the same Solution This problem is irresponsible First, ther…… -
Java – logic within enumerations
My colleagues and I are discussing the logic in enumeration My personal preference is that there is no logic in Java e…… -
Java – transparent JPanel
I want to create a translucent JPanel I do this by simply using the RGBA value of the color constructor, but the probl…… -
How do I import eclipse syntax highlighting configuration files for Java projects in NetBeans?
I have to use these two ides, and I want to use eclipse style syntax highlighting in NetBeans Does anyone know how to …… -
Java – how to prevent spring MVC from blocking all other servlets?
I am using spring 2.5 MVC and want to add another third-party servlet The problem is that spring MVC captures all requ…… -
Java – convert file to multipartfile
Is there any way to convert a file object to a multipart file? So can I send this object to the method of the object t…… -
Java – is system. Java guaranteed Nanotime() returns a unique value?
I have a multithreaded Java program that creates hundreds of temporary files in seconds Put the file in / TMP and use …… -
Add Java packages to GWT
I've tried to search, but I can't figure out how to add my package to the GWT project My tree structure is as follows:…… -
Java – Android – open or restart the application after clicking the push notification using the flag activity
I use push notifications in Android When I receive a push notification, if the application is still running, I want to…… -
Why does Java use merge sort to sort arrays larger than element 7
According to Wikipedia: But why? Both merge sort and quick sort are o (n log n) Solution The difference of the algorit…… -
Conditional if else statements in Java
See English answers > why does the internal operator unexpectedly cast integers? two public class Pre { public …… -
Java – disable digital grouping in jspinner
I need a widget to select TCP / UDP ports, so I wrote the following: public static JSpinner makePortSpinner() { fi…… -
Java solutions for C-style compiler instructions
I have a Java array: String[] myArray = {"1","2"}; I want to assign different values according to the conditions known…… -
How to upload and scan files with anti-virus software on Java?
I'm working on an application that needs file upload, and it also needs I've heard of the APIs application server prov…… -
How to quickly find main () in a java project and use eclipse?
In this case, I have a SRC folder of the project, which has many classes. How can I detect what classes start with the…… -
java. util. What is the runtime of equals() in arrays?
As the title shows, Java util. What is the runtime of equals() in arrays? For example, if you compare two ints [], doe…… -
Java – how to programmatically kill a storm topology?
I'm using a Java class to submit a topology to the storm cluster, and I'm also going to use a Java class to kill the t…… -
Java – cachedrowsetimpl cannot resolve to a type
I am using cachedrowset to save the resultset form dB CachedRowSetImpl crs = new CachedRowSetImpl(); But eclipse remin…… -
java. Lang.illegalargumentexception: the observer is null
A user of one of my applications reported this error I'm confused about how to solve what it means After a Google sear…… -
Java – how to create a global variable in Android?
See English answers > 12 Android global variables I've tried to put it in a custom class, but the problem is that i…… -
Java: cloning arbitrary collections by referencing collections
Suppose you have a method of type Java util. Collection, and it can't be said which Java it will point to at run time …… -
Avoid checkstyle magic number errors in JDBC queries
I'm having a group project in class. We're trying checkstyle I'm very satisfied with Java, but I've never touched JDBC…… -
Java – factory pattern dynamic method
I'm trying to understand the factory model If there are many implementations, there will be many switch cases in my fa…… -
Java – maps strings to integers
The simplest method in Java is to map a string (Java string) to a (positive) integer (Java int) >Are equal strings …… -
Java – jasperreports is exported to xlsx instead of XLS
I can't find how to export jasperreports 4.1 1 Xlsx file JRXlsExporter There is no xlsx equivalent I can't find a para…… -
Java – why this numberformatexception?
I have this stack trace (part) Servlet.service() for servlet action threw exception java.lang.NumberFormatException: F…… -
Java-8 – why can’t @ functionalinterface be applied to Sam abstract base classes
I just started learning camels. The first thing I saw was context.addRoutes(new RouteBuilder() { public void c…… -
When do java generics use transformations at run time?
I'm reading a discussion about C templates and c# generics and how they differ from Java type erasure generics I read …… -
How many array dimensions are supported in Java, such as [1] [1] [1]… [1]?
There is already an answer to this question: > maximum number of dimensions in a Java array3 Solution The array dim…… -
What is the classpath in Java?
I wrote a program that works on my laptop, but I really hope it works on the server I own Using netbean, I have cleane……