Difference between Simple Logging Facade for Java and Apache Commons Logging
What is the difference between Simple Logging Facade for Java and Apache Commons Logging ? ...
java
Threads sychronized
Hi I create two thread first thread to call application and second thread for read file that result from calling aplication on the first thread. Call application work fine but read the file doesnt work. can you help me plz? here is my code /* * To change this template, choose Tools | Templates * and open the template in the editor. *...
Copy binary data from URL to file in Java without intermediate copy
I'm updating some old code to grab some binary data from a URL instead of from a database (the data is about to be moved out of the database and will be accessible by HTTP instead). The database API seemed to provide the data as a raw byte array directly, and the code in question wrote this array to a file using a BufferedOutputStream. ...
Conversions and Promotions
I just wondering why this works (in Java): byte b = 27; but being method declared like this: public void method(byte b){ System.out.println(b); } This doesn't work: a.method(27); Gives a Compiler error as follows: `The method method(byte) in the type App is not applicable for the arguments (int)` Reading this doesn't give...
Synchronizing two threads...
I have two threads and I want the second thread to wait until first thread finishes. How can I accomplish this? This my code: public class NewClass1 implements Runnable { // in main CallMatlab c = new CallMatlab(); CUI m = new CUI(); Thread t1 = new Thread(c); t1.start(); Thread t2 = new Thread(m); try { ...
copying nodes in java dom api
I'm having trouble with copying nodes from one document to another one. I've used both the adoptNode and importNode methods from Node but they don't work. I've also tried appendChild but that throws an exception. I'm using Xerces. Is this not implemented there? Is there another way to do this? List<Node> nodesToCopy = ...; Document newD...
What is the Java equivalent of C's printf %g format specifier?
I tried using Formatter.format, but that seems to leave the mantissa on numbers with 0 mantissa, whereas the C version does not. Is there an equivalent of C's %g format specifier in Java, and if not, is there a way to fake it? My intention is to preserve the mantissa exactly like C's for compatibility reasons. foo.c #include <stdio.h> ...
What's the easiest way to build an appointment booking website?
My wife is starting a new business and wants me to create a website for her that will allow clients to book appointments. I could obviously go ahead and start building something from scratch, but given that this is a fairly standard problem, I would prefer to reuse an existing solution (preferably in Java, but there is some flexibility ...
Nonrecursively generating all possible permutations of elements from two arrays
I'm trying to generate all possible equations given an String array of operators (+,-,*,/) and an String array of variables (a,b,c ...). Each equation will be composed of pairs of variables and numbers (a+ b- c/ b), except the last variable, which has no operator following it. The algorithm must generate equations of variable lengths (2 ...
Why does java.util.Properties implement Map<Object,Object> and not Map<String,String>
The java.util.Properties class is meant to represent a map where the keys and values are both Strings. This is because Properties objects are used to read .properties files, which are text files. So, why in Java 5 did they retrofit this class to implement Map<Object,Object> and not Map<String,String>? The javadoc states: Because P...
Is there a way to copy a doubly LinkedList in Java without reference?
I am creating some doubly linked list of type Double and no matter how I declare another linked list of the same type, it always refers to the first list. Such as: LinkedList<LinkedList<Double>> trainingData = new LinkedList<LinkedList<Double>>(); LinkedList<LinkedList<Double>> newData = new LinkedList<LinkedList<Double>>(); Add some...
How does UI design differ when designing a software appliance console from traditional web applications?
Are there any open source frameworks that are for this purpose? How does UI design differ when designing a software appliance console from traditional web applications? Any examples of particularly well-design user interfaces for software appliances? ...
Calling a global Array
Hi, I'm currently trying to draw shapes with 2D Arrays. In my class there is a global array defined with public char canvas[][]; Up until now, I have only declared arrays with char canvas[][] = new char[height][width]; If this Array has already been declared, and I'm not supposed to amend the code I've been given, how do I call an in...
ThreadLocal; isn't it the same as creating a copy of the variable each time?
Hi, I am still confused of the concept of ThreadLocal. I have read the JavaDoc, and other related questions posted around here, but the jargons used and all didn't help me much. I kind of get the idea of ThreadLocal, that is, each thread has its own copy of the variable. So...how does this make it different from say...constructing th...
Using hprof on a running application in Sun Java 5.
We have an enterprise java application(ear - few ejb's and a webapp) deployed on to weblogic 10 and using Sun java 5. The response time , CPU and memory usage is fine under few users of load but if we increase the concurrent users to >100 we see huge CPU spikes after some time (for eg:- load test with 100 users, the CPU goes to high afte...
Print space after each word
Hi, what is an easy/effective way to combine an array of words together with a space in between, but no space before or after? I suppose it is possible to remove the space after combining everything in a loop (something like sum += (term + " "))...I don't like it though. Preferably code in Java, Python, or Ruby. Thanks! ...
Where is allocated variable reference, in stack or in the heap ?
Hi all members of stackoverflow, I have a question What happend when I declare a variable inside a method, for example. void myMethod() { Ship myShip = new Ship(); } Where is allocated myShip reference, in stack or in the heap ? I think in stack but I'm confused because I was reading in J2ME Game Programming book "Java classes ...
How to execute a Java program from C#?
Wondering if anyone knows a nice way to execute a Java command-line program from C# code at run-time ? Is it the same as executing native .EXE files ? Will it run synchronously or asynchronously (which means I may have to wait for the thread to finish to find out the results) Specifically I would like to call a little utility (whi...
Rapid Prototyping Twitter Applications?
I'm looking forward to create a bunch of Twitter applications for a website, and was wondering what solution stack worked best when trying to rapidly prototype small twitter applications? Google App Engine + Python/Django? Google App Engine + Java? Heroku + RoR? Good Old LAMP? Also, any recommendations on particular frameworks/librar...
Most effective way to process a string containing XML, in JAVA
Hello, I have a String which contains XML nodes within it, and am seeking to use DOM parsing to process this string to extract node values and store them in local variables. The XML which is stored in a String variable: <carGarage> <car> <make>Chrysler</make> <color>Red</color> </car> <car> <make>Musano</make...