logo
down
shadow

JAVA QUESTIONS

Android: Cursor is always returning null even if the database is not empty
Android: Cursor is always returning null even if the database is not empty
hop of those help? You are comparing the user ID against a string value, which will never succeed if your user IDs are numbers.In Android, you should use query parameters only for string values; you should embed integers directly into the query strin
TAG : java
Date : November 25 2020, 01:01 AM , By : Rehana Devani
Repeating for loop in menu
Repeating for loop in menu
wish help you to fix your issue Both your while loops continue looping as long as choice != 8. And since you never modify the choice inside the loop, it will just continue looping (unless 8 was input by the user).Also note that the break; you added a
TAG : java
Date : November 24 2020, 03:41 PM , By : NKGNT
Can Java garbage collector randomly delete objects in the On-Heap tier?
Can Java garbage collector randomly delete objects in the On-Heap tier?
it fixes the issue GC won't collect a live object, that is an object which is reachable from a live thread. Objects in the on-heap Ehcache storage are reachable so they won't be collected.Ehcache used to experiment with WeakReference but according to
TAG : java
Date : November 24 2020, 03:41 PM , By : srini
Apache CXF Exception: SSL connection unexpectedly closed
Apache CXF Exception: SSL connection unexpectedly closed
will help you Looks like your client is working properly but receiving an error from the server side. You can enable message logging to see the underlying XML but I would take a look at the logfiles on the server side.
TAG : java
Date : November 24 2020, 03:41 PM , By : deep
Add properties to ArrayList<Object> in Java
Add properties to ArrayList<Object> in Java
I wish this help you I have this class called Preferences. How can I push an object into this ArrayList? , You appear to need
TAG : java
Date : November 24 2020, 03:41 PM , By : Alex Carroll
Multiple Adapters or One Adapter for different lists and objects - Code Performance
Multiple Adapters or One Adapter for different lists and objects - Code Performance
With these it helps Regardless of the complexity of your layouts and processing attach to your cells, I will recommend you to use single adapter for each list.Just a small picture to illustrate the mainly operation of the RecyclerView : RecyclerView
TAG : java
Date : November 24 2020, 03:41 PM , By : efleming2
Is it good practice in Java for a class's method to redundantly return a modified global field of the class?
Is it good practice in Java for a class's method to redundantly return a modified global field of the class?
To fix the issue you can do It is a usual coding standard for a method to either mutate an object (or variable) or get information about it but never both. Therefore a method that has a return will be assumed at first glance not to have any secondary
TAG : java
Date : November 24 2020, 03:41 PM , By : Mahesh Wabale
How to change the color of the background in libgdx labels?
How to change the color of the background in libgdx labels?
it should still fix some issue I can change the color of the font like this
TAG : java
Date : November 24 2020, 03:41 PM , By : sinh
direct file path not working
direct file path not working
fixed the issue. Will look into that further I have a sqlite database file that i am accessing using a swing aplication. The jdbc driver and everyhting works. If i get the exact file location and paste it into the database url it will work. I tried u
TAG : java
Date : November 24 2020, 03:41 PM , By : Mobin Akhter
ClassFileTransformer + Javassist: no such field
ClassFileTransformer + Javassist: no such field
I hope this helps you . I think problem is this:You are adding field $$probe in currentClass (your public class com.mysql.jdbc.ServerPreparedStatement extends com.mysql.jdbc.PreparedStatement, not directly implements java.sql.PreparedStatement) but y
TAG : java
Date : November 24 2020, 03:41 PM , By : Chang9
How do I change and instance variable for an object which the user selects from a combobox?
How do I change and instance variable for an object which the user selects from a combobox?
should help you out Your JComboBox appears to be holding String objects that correspond to each Person's name, i.e., JComboBox. Instead, the JComboBox should hold a collection Person objects, JComboBox. You can control how the Person object is displa
TAG : java
Date : November 24 2020, 03:41 PM , By : Sharif Arshad
reading and updating a large xml file in java
reading and updating a large xml file in java
To fix this issue It would probably be better to use the StAX api read the document like a stream while writing out (again using StAX) the parts you don't want to change immediately to a a temporary file. When you get to a part you are interested in,
TAG : java
Date : November 24 2020, 03:41 PM , By : Mohammed Rafik
ActionListener and Thread.sleep
ActionListener and Thread.sleep
seems to work fine I have a JButton, which, as soon as I click on it, I want to change some colors after a few seconds, for example from blue -> 1 sec -> red -> 1 sec -> yellow. My problem is that, as soon as I use the Thread.sleep function in Action
TAG : java
Date : November 24 2020, 03:41 PM , By : 陈振宇
What is the maximum of number of arguments for varargs in java?
What is the maximum of number of arguments for varargs in java?
this will help A method (including the static class initializer) can have at most 64k. If the arguments are such that they can be pushed with a single bytecode that is 1 byte long each, you can have something about 64000 arguments on a call.
TAG : java
Date : November 24 2020, 03:41 PM , By : Atti
When I compile I get an error as "ask" cannot be resolved or is not a field"
When I compile I get an error as "ask" cannot be resolved or is not a field"
it should still fix some issue , ask() is a method, not a field. You need to call it as a method:
TAG : java
Date : November 24 2020, 03:41 PM , By : GEETHU G
What is the best way to check if 4 integer variables are equal to 0?
What is the best way to check if 4 integer variables are equal to 0?
Any of those help I have 4 non negative integer values a,b,c and d.how i can check if a,b,c and d all are equal to 0 in best way? Which is the best practice for minimum computation
TAG : java
Date : November 24 2020, 03:41 PM , By : Mark
Storing constant webdriver elements in an enum
Storing constant webdriver elements in an enum
seems to work fine I don't think storing locators in Enum is a good idea, neither is storing locators in properties files. Both have issues. Instead I would recommend you to use PageFactory which supports PageObjects. For debugging, updating, adding
TAG : java
Date : November 24 2020, 03:41 PM , By : MyFunnyBeard
Java: Why main class does not extend Thread class
Java: Why main class does not extend Thread class
I wish this helpful for you You are confused a bit. All code runs in some thread, yet the class that defines this code needs not extend Thread. If this were not so, all classes had to extend Thread or you couldn't call any of their methods.Look at th
TAG : java
Date : November 24 2020, 03:41 PM , By : Rocío CisRen
Java - how to find out if a directory is being used by another process?
Java - how to find out if a directory is being used by another process?
should help you out Taken from here
TAG : java
Date : November 24 2020, 03:41 PM , By : Sudiarto21
How can I get a method to print?
How can I get a method to print?
With these it helps Add displayMonth(1) to the bottom of main function. Also, find a good Java tutorial.
TAG : java
Date : November 24 2020, 03:41 PM , By : Nicholas Ayala
Java unknown exceptions
Java unknown exceptions
around this issue clockpanel probably extends a window such as JFrame. You probably meant to extend JPanel instead (although doing so is not necessary unless adding new functionality such as custom painting to the new JPanel).
TAG : java
Date : November 24 2020, 03:41 PM , By : Chandra
BufferedReader,StreamWriter crash
BufferedReader,StreamWriter crash
I wish this help you This is because when you're closing one of the stream's (osw.close();) - the socked gets closed as well. From Socket.getOutputStream's javadoc:
TAG : java
Date : November 24 2020, 03:41 PM , By : Sukhjit Singh Dadwal
found raw type: JComboBox
found raw type: JComboBox
Does that help Starting from Java 7 many Swing components use generics, so older code will produce a warning for raw types.For the combobox example you can eliminate the warning if you provide the type of the objects it holds e.g. you should use JCom
TAG : java
Date : November 24 2020, 03:41 PM , By : Anthony Hernandez
Java Generics -> Function return type
Java Generics -> Function return type
Hope this helps I have a situation like this: , Your problem is with this method:
TAG : java
Date : November 24 2020, 03:41 PM , By : Mochammad Chasan Fau
how to refresh contents of jtable on event of action listener?
how to refresh contents of jtable on event of action listener?
it helps some times Don't create a new JTable each time. Instead, get the model and replace/edit the data (best), or give the table a new model ("ok").After a model's data has been changed, you need to call a "fireTableXXX" method.
TAG : java
Date : November 24 2020, 03:41 PM , By : Satish G
Why does List interface extend Collection interface?
Why does List interface extend Collection interface?
seems to work fine They're re-written so that they can be documented, in order to specify how the List refines the contract of these methods compared to the contract specified in the Collection interface.For example, the add() method in List is docum
TAG : java
Date : November 24 2020, 03:41 PM , By : Nurtria Iman Sari
Pros and Cons of Clojure http client libraries
Pros and Cons of Clojure http client libraries
I hope this helps . I am trying to write a http file downloader in Clojure, and in one of my other questions, someone commented that using a dedicated http client library is better than coding with Clojure's and Java's own api. I did some research an
TAG : java
Date : November 24 2020, 05:47 AM , By : Jonathan Roux
use final inside a for each loop
use final inside a for each loop
wish help you to fix your issue Usually developers leave the defaults and only add code when they need to. i.e. what ever is the shortest code to write is easier. Think of a lecture theatre and they ask you to raise your hands if you do something and
TAG : java
Date : November 24 2020, 05:47 AM , By : sfz5
Convert java data object to service object
Convert java data object to service object
Hope that helps What you call "data object" is usually called an "entity". What you call "service object" is usually called a "data transfer object" ("DTO"). Those two are Java objects like all the other Java objects, and the JVM doesn't have any spe
TAG : java
Date : November 24 2020, 05:47 AM , By : wayne001
Unsupported major.minor version 51.0 while executing JSP
Unsupported major.minor version 51.0 while executing JSP
Any of those help ... but I am using JAVA 1.7 on my server and my client when I do ...
TAG : java
Date : November 24 2020, 05:47 AM , By : vskintiyan
How do I display a word diagonally in Java?
How do I display a word diagonally in Java?
Does that help I am trying to make a program that accepts a word then displays the word diagonally. So far I've only gotten it to display vertically. , You can try something like this:-
TAG : java
Date : November 24 2020, 05:47 AM , By : Ampare Lee
making sure one task completes before another starts in java
making sure one task completes before another starts in java
I think the issue was by ths following , If you have two tasks that should be performed serially (i.e. one finishes before the next one starts) then the best answer is to perform them synchronously. For instance, suppose that task1() and task2() are
TAG : java
Date : November 24 2020, 05:47 AM , By : Zach Spina
My program gives an index out of bounds error
My program gives an index out of bounds error
wish help you to fix your issue You're not changing a in the loop, so a.isEmpty() will not change and you'll continue looping until i goes out of bounds. Did you mean:
TAG : java
Date : November 24 2020, 05:47 AM , By : Hui Liu
Removing duplicate characters in a String (user inputted keyword)
Removing duplicate characters in a String (user inputted keyword)
To fix this issue There are infinitely many ways to do this. Finding your own solution within the bounds of the toolset you've established is what learning to program is all about. Here is one possible solution to get you thinking:Create a Set, which
TAG : java
Date : November 24 2020, 05:47 AM , By : Adi Ajit
Jersey 2.0 Content-Length not set
Jersey 2.0 Content-Length not set
hop of those help? I ran a quick test with Jersey Client 2.2 and Netcat, and it is showing me that Jersey is sending the Content-Length header, even though the LoggingFilter is not reporting it.To do this test, I first ran netcat in one shell.
TAG : java
Date : November 24 2020, 05:47 AM , By : Juan R
AWS.SimpleQueueService.NonExistentQueue Exception thrown when Accessing Existing SQS queue
AWS.SimpleQueueService.NonExistentQueue Exception thrown when Accessing Existing SQS queue
fixed the issue. Will look into that further Stumbled on the same problem. Solution is pretty simple after reading the Java docs more carefully :) Simply set client.setEndPoint(...) when creating your SQSClient
TAG : java
Date : November 24 2020, 05:47 AM , By : Roberto Pinto
Where can I find the source code for the com.sun.jdi package?
Where can I find the source code for the com.sun.jdi package?
like below fixes the issue You can get the source for the OpenJDK implementation of the package here. Just use the tree view on the left to select the package you want.
TAG : java
Date : November 24 2020, 05:47 AM , By : westsomething
How can I get path of resource under WEB-INF/class folder (java ee web dynamic project)
How can I get path of resource under WEB-INF/class folder (java ee web dynamic project)
wish helps you Generally speaking you should not rely on modifying files in your web application directory.One of the reasons is that servlet container is not obligated to extract your .war file to the fs, it could, in theory, run your web applicatio
TAG : java
Date : November 24 2020, 05:47 AM , By : Safer-db Dom Basilio
convert a hexadecimal into a decimal via string convert in java
convert a hexadecimal into a decimal via string convert in java
may help you . Use the overloaded Integer.parseInt method that takes a second parameter for the radix:
TAG : java
Date : November 24 2020, 05:47 AM , By : Da875
error populating a table using jstl
error populating a table using jstl
I hope this helps you . You are trying to use value attribute, which is not a valid attribute for tag. Perhaps you meant to use items:
TAG : java
Date : November 24 2020, 05:47 AM , By : Ari
If Singletons are bad then how do you store global state for a framework
If Singletons are bad then how do you store global state for a framework
seems to work fine Load this data in a place that is already global for your application. For instance, in Web applications, you can store this data in application scope i.e. ServletContext using a ServletContextListener.Also, you can use a framework
TAG : java
Date : November 24 2020, 05:47 AM , By : karakuratown
input system where the user inputs the array position of the object followed by a # to indiacte quantity but it gives me
input system where the user inputs the array position of the object followed by a # to indiacte quantity but it gives me
Does that help You're splitting the same String twice, but Strings are immutable so you're getting back two different arrays while the original String stays the same. Therefore, if you have input like:
TAG : java
Date : November 24 2020, 05:47 AM , By : Sigit Utomo
Java: when would I ever want to use static methods when I can use a singleton instead?
Java: when would I ever want to use static methods when I can use a singleton instead?
Hope that helps As with all questions of this nature, use the right tool for the job. Use a singleton when your class represents an object that there can be only one of. Use static methods when your methods are appropriate for the class they are memb
TAG : java
Date : November 24 2020, 05:47 AM , By : Queue
Extracting RSA public key modulus and exponent stored in unsigned char arrays
Extracting RSA public key modulus and exponent stored in unsigned char arrays
will be helpful for those in need I'm assuming that you can't just send binary data since you mention the hexadecimal conversion. The most compact way you can send the data as text would be with base 64 but this is more complex than hexadecimal.Clien
TAG : java
Date : November 24 2020, 05:47 AM , By : Johnno
What does "cannot be resolved to a type" mean, and how can I fix it? Java Android 4.0
What does "cannot be resolved to a type" mean, and how can I fix it? Java Android 4.0
wish help you to fix your issue As the error is trying to tell you, there is no type named DialogInterface.onClickListener.Java is case-sensitive; you need a capital O.
TAG : java
Date : November 24 2020, 05:47 AM , By : Игорь Коломиец
How can I have a callback on stdout/stderr readiness instead of busy polling?
How can I have a callback on stdout/stderr readiness instead of busy polling?
Hope that helps If you have an event loop, you can start a background thread to add events to that event loop.e.g.
TAG : java
Date : November 24 2020, 05:44 AM , By : Susan Klein
How to report AWT/Swing event queue length programmatically?
How to report AWT/Swing event queue length programmatically?
like below fixes the issue Interesting subject. I've investigated the EventQueue code a bit, and while I haven't solved your problem, I may have some useful pointers: Oracle's implementation of EventQueue doesn't keep a size variable, so unless you t
TAG : java
Date : November 24 2020, 05:44 AM , By : Rob Fritz
What is the difference between different for loops in Java?
What is the difference between different for loops in Java?
seems to work fine Your second variant is the best (and it's essentially equivalent to your third, but less verbose). The reason it's superior is because you're looping via an Iterator as opposed to calling get() multiple times, as you would have to
TAG : java
Date : November 24 2020, 05:44 AM , By : Norbert D'Souza
Java arrays effective use/alternative
Java arrays effective use/alternative
hope this fix your issue This is simple code which should demonstrate point of my question.I don't know if there are some more effective implementations of arrays than this one.What makes them so uncomfortable to me is that we have to write condition
TAG : java
Date : November 24 2020, 05:44 AM , By : Pedro Berrios Maulen
EasyMock chained method call producing null pointer exception
EasyMock chained method call producing null pointer exception
With these it helps I am using EasyMock to try and mock iteration through a list of items that are two levels deep. My unit test code is below , You probably need to add the EasyMock.replay();
TAG : java
Date : November 24 2020, 05:44 AM , By : Z.Wang
Installing Java on Windows 8
Installing Java on Windows 8
around this issue I'm in a Java I class and I have a new-ish laptop with Windows 8 on it. I've installed Java and changed the environment variables, created a Path, etc. When I enter java or javac in the cmd, it comes back with information. But when
TAG : java
Date : November 24 2020, 05:44 AM , By : JayLord Andrada Lagu
Java: Is it bad practice to write methods that start with "get" when they aren't getters?
Java: Is it bad practice to write methods that start with "get" when they aren't getters?
I hope this helps you . Using the prefix get for methods that serve a purpose greater than a simple getter can be misleading since the method may have unintended consequences not expected by the caller.It would be a better practice to extract the add
TAG : java
Date : November 24 2020, 05:44 AM , By : Devin Jones
Can Iterable.filter() skip processing with "constant" (including short circuited) Predicates?
Can Iterable.filter() skip processing with "constant" (including short circuited) Predicates?
will be helpful for those in need There are reasons why this would not be a good idea: it wouldn't end up being an "optimization."Specifically, the users who'd be affected by this optimization are a very small fraction of the users of Predicates.and
TAG : java
Date : November 24 2020, 05:44 AM , By : daniel hayden
How to save edited JTable data to database?
How to save edited JTable data to database?
To fix this issue As you are using DefaultTableModel you have to register a listener to that model a TableModelListener listening for changes. How to use TableModelListenerExample:
TAG : java
Date : November 24 2020, 05:44 AM , By : wilbil1
Java Packet Sniffer
Java Packet Sniffer
seems to work fine I am not answering how you can write a sniffer but still wondering why do you want to do it when tomcat provides an option to dump the complete http requests. It may help you save a lot of time without actually writing any code and
TAG : java
Date : November 24 2020, 05:44 AM , By : Paul Lange
I have a getText error
I have a getText error
will be helpful for those in need After compiling the code below, I get the error Could not find symbol on that line which contains String str = getText(jtf). I Checked the java docs but i could not understand the syntax. Please help me as i am a com
TAG : java
Date : November 24 2020, 05:44 AM , By : Giuliana Richetta
Reading bytestream and writing to file
Reading bytestream and writing to file
this will help Currently I have this implementation working reading from a bytestream and writing out to file. I am wondering if this is particularly dangerous or discouraged against, in the essence of time I'm unable to test all the different implem
TAG : java
Date : November 24 2020, 05:44 AM , By : hegu2212
dat file is not get created by buffered writer
dat file is not get created by buffered writer
fixed the issue. Will look into that further I am stuck up in a odd sitution I have to create a .dat file named abc.dat but the issue is that when I create it then in my c: drive I check that file with extension .dat is not cretaed instead file with
TAG : java
Date : November 24 2020, 05:44 AM , By : Sean Reddell
Converting a pdf to word document using java
Converting a pdf to word document using java
it should still fix some issue In fact, you need two libraries. Both libraries are open source. The first one is iText, it is used to extract the text from a PDF file. The second one is POI, it is ued to create the word document.The code is quite sim
TAG : java
Date : November 24 2020, 05:44 AM , By : Lorenz Rossi
Measuring memory use of a piece of code at runtime in Java as an on-going functionality of a service
Measuring memory use of a piece of code at runtime in Java as an on-going functionality of a service
it helps some times I think using ThreadMXBean is the best way to achieve this, you can get all the info you need.We are using this snippet to mesure the max memory used during an execution:
TAG : java
Date : November 24 2020, 05:44 AM , By : Mando

shadow
Privacy Policy - Terms - Contact Us © ourworld-yourmove.org