So for some research work, I need to analyze a ton of raw movement data (currently almost a gig of data, and growing) and spit out quantitative information and plots. I wrote most of it using Groovy (with JFreeChart for charting) and when performance became an issue, I rewrote the core parts in Java. The problem is that analysis and pl...
I found a couple of threads that touch on development of C#/Java apps but I don't think they go along with this question. I was wondering if it was a good idea to be developing Java, C#, and .NET applications on one computer. That means there's ## .NET versions installed at one time, ### Java JRE's installed at any given time. Is that a...
If I have a collection, such as Collection<String> strs, how can I get the first item out? I could just call an Iterator, take its first next(), then throw the Iterator away. Is there a less wasteful way to do it? ...
This could be language agnostic/helpful answers could just be in pseudo-code. I have a program that I would like to test under a range of inputs. This program takes a set of files, one of which is designated as the root. I want to run the program with all possible subsets of files. (Two subsets, containing the same files, but with diffe...
Using freemarker, is there any way to reference a value indirectly along the lines of... <#assign apple=fruit> <#assign item=apple> ${${item}} to produce the output 'fruit' without prior knowledge of what value item might contain? ...
Can Java nest generics? The following is giving me an error in Eclipse: ArrayList<ArrayList<Integer>> numSetSet = ArrayList<ArrayList<Integer>>(); The error is: Syntax error on token "(", Expression expected after this token ...
I am trying to integrate a non-Java executable into a Java webapp on the server-side (Linux). Some details about the executable: Written in C++. The executable takes some input either from stdin or file and generates an output file. The executable is not designed to be a long running process i.e it generates an output and then dies out...
Server public void run () { Socket serversocket = new ServerSocket(port); while(true) { new Thread(new ServerThread(serverSocket.accept())).start(); } } //serverSocket.close(); etc ServerThread public void run() { BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream())); String input; w...
I have a JInternalFrame window that needs to popup a modal dialog box when a JButton is pressed. At first, I tried using JDialog, but I found that JDialog constructor needs: JFrame boolean modal I tried passing JInternalFrame to it, but the type didn't match. Should I use JDialog with JInternalFrame? What if I dont specify the owner...
So, I'm using freemarker templates with Struts2 to formulate my responses. However, since I'm trying to use taconite as well, I need the response to be sent with the content type of "text/xml". I can't seem to find a way to use freemarker directives to set the content type, and I am not well versed enough in struts to know if there is ...
I've got a Client who needs to send a UDP packet to a server and the only reference he has to the Server is through the CORBA naming service (IOR). I know the IOR has the Server Information embedded but is there an easy way for me to extract it? This is the code I have so far: Object objRef = orb.resolve_initial_references("NameService...
I need help making AOP work. What am I missing here? <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2...
How come this code doesnt compile? class A { class B { public enum Enum <-- this line { AD, BC } } } Compiler reports: enum declarations allowed only in static contexts. But then when I put the Enum inside class A, everything is okay. This is quite surprising. I dont think I have this problem in C++...
Hi .. I have a problem in Java hashtable serialization that seems illogical to me but i am not able to find out the error in the logic i am using. Here is what i am doing, Hashtable sspsrpData = new Hashtable(); for(int i=0;i<Constants.secondayStructures.length;i++) { SecondaryStructures ss = (SecondaryStructures)(data.get(Constant...
I understand that String[] args is an array of strings passed into main as parameters. java Print "Hello, World!" class Print { public static void main(String[] args) { System.out.println(args[0]); } } However, when you don't include it as a parameter (even if you don't use), it throws an exception. So why is it required?...
I want to have the PluginManifestEditor functionality in my view(not in a editor). Also I need to add some extra pages to it(along with the existing ones like Overview, Dependencies, runtime etc.). I know that its implemented in org.eclipse.pde.ui plugin. I just started diggin in to the code and found that the javadoc is sparse and not ...
How to extract the path "c:/documents and settings/user" using Java... Is there any method?? ...
I have an android client which will make Http connections to a server. The server requires that all Http request provide a monotonically increasing counter in the Http header. e.g. POST /foo/server X-count: 43 Places that will initiate Http connections: Inside activities under the user's command e.g. button clicks Inside a Service ...
I have basic idea on Kilo Virtual Machine on Mobiles , I have clear idea of how JVM works class loaders , Executable Engine,Method Area etc . Technically how KVM differs from JVM ? Does KVM increases the execution time as compared to JVM ? Any Performance Oriented difference ? Memory management Thanks ! ...
Hi, i have three tables and 2 JPA model classes: Unit ------------ id [PK] - Integer code - String unitGroups - List<UnitGroup> UnitGroup ------------ id [PK] - Integer ugKey - String units - List<Unit> units and unitGroups have many-to-many relationship between themselves. briefly i want to write an HQL query...