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• "Cannot find symbol" problem when using Class.forName().

  - by joseph

  I'm getting the Cannot find symbol error from my code. Does anyone know what can cause this problem? // Register JDBC driver Class.forName("net.sourceforge.jtds.jdbc.Driver"); method forName(java.Lang.String) Class.forName("net.sourceforge.jtds.jdbc.Driver); ^

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• How to check if an IP address is the local host on a multi-homed system?

  - by MItch Branting

  For a machine with multiple NIC cards, is there a convenient method in Java that tells whether a given IP address is the current machine or not. e.g. boolean IsThisMyIpAddress("192.168.220.25");

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• How to fetch parameters when using the Apache Commons CLI library

  - by Mridang Agarwalla

  I'm using the Apache Commons CLI to handle command line arguments in Java. I've figured out my way around it to a decent extent but I need a little help. I've declared the a and b options and I'm able to access the value using CommandLine.getOptionValue. Usage: myapp [OPTION] [DIRECTORY] Options: -a Option A -b Option B How do I declare and access the DIRECTORY variable? Thank you.

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• Convert from vector of arrays to one array

  - by Afro Genius

  I have a vector of float arrays i.e. Vector . I want to convert this to one float array i.e. move every element in every float[] within the vector to a new float[]. Am a bit puzzled on using the Java built in method vector.toArray() to do this. Any ideas pls?

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• Is it possible to create a DateFormatter which converts a two-digit year into a four-digit year?

  - by DR

  In my Java application I use a DateFormat instance to parse date inputs. DateFormat fmt; fmt = DateFormat.getDateInstance(DateFormat.DEFAULT) // dd.MM.yyyy for de_DE The problem is that the user insists to enter dates in the form 31.12.11. Unfortunately this is parsed to 31.12.11. (0011-12-31 in ISO format) Instead I want the parsed date to become 31.12.2011 (2011-12-31 in ISO format). Can I modify the date format to somehow parse inputs that way?

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• If I want to develop games that are interactive on a website and can communicate with the server, sh

  - by J Lynch

  If I want to develop games that are interactive and can communicate with the server, should I learn to program in Flash, SIlverlight, or Java?

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• Implementing C# for the JVM

  - by Rob

  Is anyone attempting to implement C# for the JVM? As a Java developer, I've been eyeing C# with envy, but am unwilling to give up the portability and maturity of the JVM, not to mention the diverse range of tools for it. I know there are some important differences between the JVM and CLR but is there anything that is a showstopper?

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• Removing all items of a given value from a hashmap

  - by Anthony Webb

  So I have a java hashmap like below: hMap.put("1", "One"); hMap.put("2", "Two"); hMap.put("3", "Two"); I would like to remove ALL items where the value is "Two" If I do something like: hmap.values().remove("Two"); Only the first one is deleted, I want to remove them all, how can this be done?

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• will php/apache ever support multi threading?

  - by fayer

  i mainly focus on the web, i think i will never create desktop applications. so i think it's better for me to focus on typical web languages like php. i know an advantage java has over php is multi threading though. will php ever support this feature in the future? thanks

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• Using static variables in Android

  - by michael

  Hi, In android, are using static variables a recommended practice? E.g, implementing a Singleton pattern in Java, I usually do: private static A the_instance; public static A getInstance() { if (the_instance == null) { the_instance = new A(); } return the_instance; } Also, when does this get cleaned up by the Android JVM? Thank you.

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• warcraft3 packet infromation [closed]

  - by ajay009ajay

  Hello All, I have made a program which is fetching data from server to and game to server. I want to keep these record in my file. But my problem is this is not in good format that i can read easily. I am reading all data as "Byte" (from java). Can anybody explain header or data info of packet. so I can read it in human manner Huh thanks.

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• UnsupportedOperationException on Collection

  - by Duke Vador

  While studying the Collection API, we find that some methods (add, remove,...) may throw a java.lang.UnsupportedOperationException if the current implementation of the Collection does not support those functionalities. Is there,actually, in the JDK, a concrete Collection that does not support those methods ? Thanks a lot for your answers.

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• displaying special characters in hyperlink text

  - by swati

  i have used html in my java class and in one case i have used username.Username is a variable which gets values dynamically. in one case its value is 'rg@bg' but here instead of d name i m getting d url which it is directed to in my jsp. how do i ensure tht d value of username comes on d display page as it is. i have tried "@"+username. didnt work

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• Android Calendar API vs Calendar Provider API

  - by John Roberts

  I'm a little bit confused about the difference between the two. An example of the Calendar API is supposedly located here: http://samples.google-api-java-client.googlecode.com/hg/calendar-android-sample/instructions.html, but the author himself suggests using the Calendar Provider API, details about which are here: http://developer.android.com/guide/topics/providers/calendar-provider.html. Can someone explain to me the difference between the two, and which would be better for me to use for a simple calendar app?

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• Where can i find exercises for familiarising OOPS

  - by CrazyBoy123

  Now that i have learned the theory of OOPS in good number of books , and practised a little. Still i am not comfortable when i look into OOPS being applied in some of the Open Source projs. Can someone suggest any problem / solution kind of book , or any resources , that covers OOPS end - end. (C# , Java preferably)

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• Passing JSON through the URI

  - by Leaf

  I'm trying to create a REST based web service with data encapsulated using JSON. My problem is when I pass the string version of JSON in the URI it turns to something like this: %7B%22coal%22:100,%22ele%22:1500.1%7D. I'm wondering if there are any functions Java for converting between the escaped and unescaped versions so I can parse the string.

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• Is it safe to use connection.createStatement().executeQuery(String query);?

  - by javanix

  Is it safe to do connection.createStatement().executeQuery(String query);, or should each java.sql.Statement object be created and closed by "hand" on every use, even if the connection is closed in a finally block? If multiple queries are executed in one method by one connection it would use much less code if instantiating and closing each statement wasn't strictly necessary.

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• problem of new Date(long), begin with Jan 01 01:00:00 CET 1970 ??

  - by chun

  the java doc describe that the constructor Date(long date) constructs a Date object using the given milliseconds time value since January 1, 1970, 00:00:00 GMT actulely when i did new Date(0), the date is Jan 01 01:00:00 CET 1970 I don't know why it begin with 01h

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• A question about GC

  - by chun

  This is a quesiton taken from a java exam, How many objects are eligible for gabage collection at #1 ? public class Main { Integer x = 32768; public static void main(String[] args) { Main m = new Main(); m = null; // #1 } } I thought it just collect Integer x, does GC even collect the Main object m?

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• Remember the values entered on standalone app on the client side

  - by kshtjsnghl

  We have a standalone java swing app, in which the user can print something that he drew, on a printer by giving its IP. Now the requirement is that the app needs to remember the ip that was given the last time by this user. What I could think of till now is (a brute one though) - keep a log file kind of storage on the client machine, and that everytime the app comes up it reads the last submitted one. Any suggestions would be helpful. Thanks in advance.

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• Varying behavior for possible loss of precision

  - by szupie

  In Java, when you do int b; b = b + 1.0; You get a possible loss of precision error. But why is it that if you do int b; b += 1.0; There isn't any error?

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• JFileChooser on OS X

  - by Hamza Yerlikaya

  JFileChooser looks nothing like the native widget. I seem to remember reading some hack to get it look like the native widget but searching for it know i can't seem to find it again i came across posts that suggest using java.awt.FileChooser but that class does not seem to be in the distribution. How can i make JFileChooser make look like the native widget?

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• Clean Stack Traces in Groovy using Eclipse?

  - by yar

  I am using Groovy in a Java Swing application as part of my plan to force-feed myself dynamic languages until I like them (which is happening, partly). My stack traces are filled with Groovy stuff like org.codehaus.groovy.runtime.callsite.ConstructorSite$ConstructorSiteNoUnwrapNoCoerce.callConstructor is there a way to get Eclipse to remove all of that codehaus stuff (filter stack traces, basically)? Edit: I can do this from the command-line with grep (well, not yet) so it's not so bad, but inside of Eclipse would be great too.

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• Block windows shutdown

  - by Stas

  Hi! I need execute some code before Windows shutdown process each time. So, I want block Windows shutdown process for some time. How can i do it from Java or C++ Builder ? Thanks.

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• Is MobiForms for Android worth investigating ?

  - by Alan B

  I'm working my way through the NotePad tutorial, and that's all fine - I'm not a Java programmer but it's close enough to C# (or vice versa) to make it easy to pick up. I'm surprised that there aren't any RAD tools for Android apart from Mobiforms. Is there anyone out there with experience of Mobiforms ?

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