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?
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);
^
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");
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?
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.
i have to create a program to login on facebook using example http://code.google.com/p/facebook-java-api/wiki/Examples but
when i run project then i get my doFilter method does not call after complete init method please give me solution
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?
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.
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?
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.
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.
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.
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?
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?
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
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.
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
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
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?
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.
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)
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.
I want to build a sip client based on SIP Communicator - the Java VoIP and Instant Messaging client. Basically I need to plug in some how and redirect VoIP to and from my application. Where is a good place to start?
If this seems a bit vague, I do apologize.
If I want to properly exit a documentum java job (if params are invalid for example), should I use a system.exit() or is there another way to do it.
As far as I know system.exit closes the virtual machine, does it have an effect on other jobs running?