If we are to catch specific forms of IOException, or any other kind as a matter of fact, and we only try and catch a couple (and define definitive outputs for them) say FileNotFoundException ZipException should we always trail it off and cover all bases with a catch(IOException e){ e.printStackTrace(); } and then possibly go ev...
I am wondering how in practice other SOers tend to deal with and/or prevent exceptions. In what situations do you prevent exceptions, and how? In what situations do you catch exceptions? I usually prevent 'NullPointerExceptions' (and other similar ones) by, well, essentially saying if(foo!=null) {...} I find that in most situations t...
I am a newbie, I have a question. I have a map. I have to loop through the map and build the iterator. Example: public Iterable<Test> getTests(Map<String, Test> testMap, Set<String> strings) { //loop tru the set of strings and build iterator. for(final String test1 : strings) { Test test = testMap.get(test1); ...
I have a JTable inside of a JScrollPane. I am creating a custom cell editor for one of the columns of the table, and I want this editor to pop up a scrolling JList. I've done this by using a Popup to show a new JScrollPane containing the JList. Everything is working, except for the position of the Popup. My custom component for the edit...
In java, how can I find out if a specific date is within 1 year of today's date. I have the following but not sure if this is the best approach. String date = "01/19/2005"; DateFormat df = new SimpleDateFormat("dd/MM/yyyy"); Date lastExamTakenDate = null; Calendar todaysDateMinus1Year = Calendar.getInstance(); t...
I have some troubles with positioning my label/password field. With this code they both get positioned in the center next to each other, while I actually want them in the middle of my panel on top of each other. Does anyone know how I should do that? import java.awt.BorderLayout; import java.awt.FlowLayout; import javax.swing.ImageIcon...
I realize I'm going to get flamed for not simply writing a test myself... but I'm curious about people's opinions, not just the functionality, so... here goes... I have a class that has a private list. I want to add to that private list through the public getMyList() method. so... will this work? public class ObA{ private List<Strin...
I need to make a simulation of robotic motors. These motors are AC supplied Variable Frequency Motors where the Pulse Width Modulation frequency controls the speed and torque. The primary vendors are ABB and Siemens. The communication from controlling computers is via an industrial networking protocol called Profibus. Are there any k...
I have configured java to dump garbage collection information into the logs (verbose GC). I am unsure of what the garbage collection entries in the logs mean. A sample of these entries are posted below. I've searched around on Google and have not found solid explanations. I have some reasonable guesses, but I'm looking for answers whic...
Could someone recommend a good and inexpensive software synthesizer which generates really good piano sound (sample-based); support for other instruments is not required. OS: Windows or MacOS. Java interface would be a great asset. ...
[EDIT] this happend on OSX with Java 1.5! (but may also happen on Windows!) It seems japanese users of my Java Swing program cannot write japanese symbols in JTextFields. Actually they can write them but do not see them. They only see blocks which somehow indicates I think that the font does not support these symbols. I set my own font...
I'm printing a complicated swing application UI to a physical printer via an Airport. I've got Mac & windows machines both printing to the same printer. Printing from the Mac looks great. Printing from windows looks far from great - everything is very pixelated, including fonts and graph lines. Some digging around reveals that the av...
We would like to some processing in a Java application, store the results in our pool of memcache servers, and read it back using memcache in PHP. This is easy enough to try, but I though I would ask and see if anyone else has done this. As long as both the Java and PHP clients connect to the same pool of memcache servers, will both cl...
I am looking for a Java library to display map data from various sources, including shapefile, WMS, WFS, Google Maps, possibly ArcIMS, etc. It seems like OpenLayers is the closest thing to what I want, except it's a JavaScript library, and I'm writing a Swing application. GDAL looks promising, but as far as I can tell there won't be Jav...
I'm working with Java project that requires very advanced manipulations of images. In fact, I'm doing most of the manipulation using OpenCV, and I'm using JNI to wrap around the OpenCV functions that I need. I am extremely satisfied with the performance OpenCV gives, the people who wrote the OpenCV code deserve great great credit for the...
Hello there, i'm working on a project that consists of a website that connects to the NCBI(National Center for Biotechnology Information) and searches for articles there. Thing is that I have to do some text mining on all the results. I'm using the JAVA language for textmining and AJAX with ICEFACES for the development of the website. ...
Hi everyone, I'm building an emailing system for a framework I'm developing. Thus far, I've got a generic MailMessage interface that every different type of email message will implement, something along the lines of public interface MailMessage { public String[] getTo(); public void setTo(String[] to); public String getFr...
I usually always find it sufficient to use the concrete classes for the interfaces listed in the title. Usually when I use other types (such as LinkedList or TreeSet), the reason is for functionality and not performance - for example, a LinkedList for a queue. I do sometimes construct ArrayList with an initial capcacity more than the d...
Hi, I'm trying to load a java .class file dynamically and call it by reflection. I've got a class called Foo; it has an empty constructor and has one method called doit() which takes a String argument and returns a String. Also it reverses the String. Here is my code: URL url = new URL("file://C:/jtest/"); URLClassLoader loader = ne...
I've worked with JSF, Spring MVC and Struts and I think I got a good level on these frameworks. Recently I heard that many good developers I worked with are learning Grails and using it in their projects. What are the practical advantages of Grails over other frameworks? Is worth to learn it besides I know other frameworks? What is all ...