Java
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Java – use write Xlsx replace the existing worksheet with R package xlsx
I am using package xlsx version: 0.0 7 date: August 1, 2014 In R version 3.0 1 (May 16, 2013) – good sport platform: i…… -
Java – collection removeAll ignore case?
OK, that's my problem I have to use HashSet. I use the removeAll method to delete existing values from another collect…… -
Why do you need to “and” some character conversions in Java bit by bit?
Here, I am using java to c# sample application translation, involving encryption (AES, RSA, etc...) At some point in t…… -
Bad use of very large strings? (JAVA)
Is there any negative creation of huge strings? For example, if we read text from a potentially large text file: while…… -
Java – after upgrading from 12 to IntelliJ 13.1, the Maven project will not compile
My code will not compile after upgrading Importing from a library containing dependencies for Maven shows a compilatio…… -
Format the PowerShell string containing the hash table value
The answer may be simple, but it took me half an hour to solve the problem Suppose I have the following hash table: @ …… -
Java – if it doesn’t exist, add a new value to the map, or add it
I have a Java util. Map < foo, double > foo of a key class Let's call an example of a map I want to add {foo, f}…… -
Java – do I need to call releaseintarrayelements on an array created using newintarray?
I have a local method to do some work on bitmaps Inside the method, I obtain image data through a method call, which w…… -
Java – JAXB, custom binding, adapter1 Class and joda time
I have a problem. JAXB is generating binding classes for XML schema (I can't modify them for precision) public class D…… -
Java – can annotation processors be used for code generation?
Suppose I define an annotation named @ myannotation One class X is declared as: @MyAnnotation class X { .... } Now whe…… -
Java fallback mode
I try to find a good way to implement a service that depends on third-party library classes I also have a "default" im…… -
How to view memory allocation stacktrace in Java visual VM
This article describes how to use Java visualvm: http://rejeev.blogspot.de/2009/04/analyzing-memory-leak-in-java.html …… -
Java – wicket & CSS resources
I've been looking for it. I can't find a virtual guide to add my CSS to the wicket website project But before I starte…… -
Java – unable to instantiate log4j appender
I'm following a tutorial on log4j logging in web applications This is my log4j Properties file: #log to console log4j.…… -
Java – how to map a class to different tables using hibernate / JPA annotations
At present, my persistence seems to be a very simple problem, but I can't seem to find a way: I have two identical tab…… -
Drawing java with canvas
I want to draw Java canvas, but I can't make it work because I don't know what I'm doing This is my simple code: impor…… -
Java – a shorter method for dynamically obtaining the name of the current method
See English answer > getting the name of the current executing method18 This is what we are doing now: new Object()…… -
Java – immutable objects and spring / sring MVC: the right choice?
I usually try to design my courses as immutable classes, so I have many advantages in programming stress However, when…… -
How do I use selenium webdriver and Java to close a specific window?
I use selenium webdriver I open the first page and then the second - do something and go back to the first page Before…… -
Java – high performance JMS messaging
I read the slide from this year's uberconf. One of the speakers is arguing that spring JMS adds performance overhead t…… -
java – URLConnection setRequestProperty vs addRequestProperty
Let me say I'm talking about HTTP to a web server. I will accept HTML or text, but I prefer HTML In other words, the t…… -
Java – use wildcards to create new generic objects
Please explain the compilation time error of this generic code wildcard: //no compile time error. List<? extends Nu…… -
Java – play! The framework returns a JSON response
I use play! Framework 2.0 and I are new in this framework How to return only the JSON representation of my model in a …… -
Java – dependency management and maven
I recently became a big fan of Maven to control the build cycle of my application However, I encountered some rough ed…… -
Java – enables NetBeans (ANT) to generate multiple jar files for a project
I have a NetBeans project with two main classes. One starts a client and the other starts a server I need to create tw…… -
Learn Java, so I can get clojure
I have a history of hating Java. In the "slow ball" era, I often used it in the late 1990s Therefore, I never really u…… -
java – Spring Batch：org. springframework. batch. item. Reader notopenexception: the reader must open it before reading
I read about the problem, but the solution didn't work for me I got org springframework. batch. item. Reader not opene…… -
Java – iteratively find a map entry at the index?
I have a LinkedHashMap I want to get foo in index n Is there a better way to do this than iteration? int target = N; i…… -
Multiple OpenGL contexts, multiple windows, multithreading and Vsync
I am using OpenGL to create a graphical user interface application that can have any number of windows - the "multi do…… -
”””Is it a good way to convert an integer to a string in Java?
See the English answer > How do I convert from int to string? nineteen int i = 0; String i0 = i + ""; So, is this a…… -
Java – why can’t you call a super constructor from an enumeration constructor?
public enum A { public enum A { A(1); private A(int i){ } private A(){ super(); // comp…… -
Java – maven-tomcat7-plugin generates a corrupted executable jar
I encountered a problem when using the maven tomcat7 plug-in to generate a jar archive with an embedded tomcat7 instan……