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JAVA QUESTIONS

Does Android support Java 11?
Does Android support Java 11?
I hope this helps . I am new to android development. And I have installed eclipse, java 11 and android sdk tools in my computer. But when I try to build a project it says that to upgrade tools. But I have installed the latest sdk. , As official doc s
TAG : java
Date : November 06 2020, 07:00 PM , By : Senthur Pandi S
How do I receive byte array sent from a server and read 4 single bytes at a time
How do I receive byte array sent from a server and read 4 single bytes at a time
To fix the issue you can do I need to receive 320 bytes of data from a server which consist of 80 4 byte int fields. How do I receive them in bytes of 4 and display their respective int values? .
TAG : java
Date : November 06 2020, 07:00 PM , By : speed_ani
How to use datastore cursors with jpa on GAE
How to use datastore cursors with jpa on GAE
To fix this issue Can you try this (adapted from the JDO sample):
TAG : java
Date : November 06 2020, 07:00 PM , By : user3857199
How to define a method that can take arbitrary arguments in java?
How to define a method that can take arbitrary arguments in java?
This might help you varargs were introduced in Java 5.For instance:
TAG : java
Date : November 06 2020, 07:00 PM , By : user3857193
is it is possible to disable the windows keys using java
is it is possible to disable the windows keys using java
Does that help You can use JNA to achieve this.Include jna.jar and platform.jar on the classpath and create the following class. This class disables left windows key (0x5B) and right windows key (0x5C). So you can add other codes at the switch case s
TAG : java
Date : November 06 2020, 07:00 PM , By : user3857167
What method in Java is used to destroy your objects
What method in Java is used to destroy your objects
help you fix your problem Sorry, but there isn't really a "free" or "dispose" equivalent in Java.The best you can do is just set the object to null (removes the reference). Then explicitly tell the garbage collector you're going rambo (its somewhere
TAG : java
Date : November 06 2020, 07:00 PM , By : user3857164
Compile Error Using MutableClassToInstanceMap with Generics
Compile Error Using MutableClassToInstanceMap with Generics
will help you The purpose of the putInstance method, as opposed to the regular put, is to provide compile-time type safety. In this case, you and I can easily reason that number must be of the type given by number.getClass(), but to the compiler, tha
TAG : java
Date : November 06 2020, 07:00 PM , By : CodeJag
Why does the Java VM not recover after "Too many open files" errors?
Why does the Java VM not recover after "Too many open files" errors?
around this issue I think that the reason you are getting repeated ClassNotFoundExceptions is that the first attempted class initialization of ControllerThreadSocketFactory failed due to the Socket leakage problem. Your code is now repeatedly doing t
TAG : java
Date : November 06 2020, 07:00 PM , By : user3857141
Httpclient not returning entire response
Httpclient not returning entire response
I hope this helps you . This might not be it, but sometimes this can happen if you aren't flushing a stream somewhere.
TAG : java
Date : November 06 2020, 07:00 PM , By : William Leong
How to pass a serialized object to appengine java task?
How to pass a serialized object to appengine java task?
To fix the issue you can do You have a few techniques to deliver the byte stream using Queue API,
TAG : java
Date : November 06 2020, 07:00 PM , By : user3857124
Please help with my twodimensional array source code
Please help with my twodimensional array source code
like below fixes the issue Here is what i have done but i have some questions: , Question 1 - look at your code:
TAG : java
Date : November 06 2020, 07:00 PM , By : Frank Abedini
Why my object sees variables which were not given to it in the constructor?
Why my object sees variables which were not given to it in the constructor?
help you fix your problem final variables declared in the enclosing method can be accessed by an anonymous inner class in that method. If you would make the parameters non-final, you would see the compiler complain. You can't declare a constructor in
TAG : java
Date : November 06 2020, 07:00 PM , By : KGT
run a servlet program in tomcat 6.0
run a servlet program in tomcat 6.0
I wish did fix the issue. First, you need to declare your servlet in a web deployment descriptor (a web.xml file) which looks like this:
TAG : java
Date : November 06 2020, 07:00 PM , By : Rammohan
is it possible to change titlebar color of JFrame or JInternalFrame
is it possible to change titlebar color of JFrame or JInternalFrame
fixed the issue. Will look into that further I do not think that you can do anything about the colors in the title bar of a JFrame, at least not without using native code to implement a platform-specific solution. That is because JFrame actually uses
TAG : java
Date : November 06 2020, 07:00 PM , By : Eduardo Almeida
Custom view in ListView disappears while scrolling in Android
Custom view in ListView disappears while scrolling in Android
may help you . Try setting android:cacheColorHint="00000000" in the XML layout file for the ListView.Check this- ListView Backgrounds: An Optimization http://developer.android.com/resources/articles/listview-backgrounds.html This can solve your probl
TAG : java
Date : November 06 2020, 07:00 PM , By : caltac
NullPointerException, Collections not storing data?
NullPointerException, Collections not storing data?
Hope that helps Ah. Your Hydro class is completely wrong. You're assigning the parameters to the uninitialised members.e.g.
TAG : java
Date : November 06 2020, 07:00 PM , By : Krishna Kumar Goutam
Creating lots of arrays
Creating lots of arrays
fixed the issue. Will look into that further I recommend reading the tutorial on arrays. It covers basic array manipulation, including creation of "multidimensional" arrays.
TAG : java
Date : November 06 2020, 07:00 PM , By : user3856994
Singleton pattern and broken double checked locking in a real-world Java application
Singleton pattern and broken double checked locking in a real-world Java application
I wish did fix the issue. Illustrating example of a singleton with respect to double-checked locking that looks clever but is broken The start of a synchronization block guarantees that you see the latest data, but it does not guarantee reordering, y
TAG : java
Date : November 06 2020, 07:00 PM , By : No One
How to get a random letter from a list of specific letters?
How to get a random letter from a list of specific letters?
will help you I've started writing some JAVA code and now I want to get a random letter from list of letters given so what should I use for this. , I'll take your question literally:
TAG : java
Date : November 06 2020, 07:00 PM , By : Ali Mohammad
Can a java program "type" into another windows program like notepad
Can a java program "type" into another windows program like notepad
I think the issue was by ths following , is there anyway to type into a notepad.exe process from a JAVA process? , Yes, using the robot is the solution:
TAG : java
Date : November 06 2020, 07:00 PM , By : user3856974
Jetty 7 Continuations: How to *not* redispatch the request?
Jetty 7 Continuations: How to *not* redispatch the request?
This might help you See the documentation around continuation.isInitial() - from http://wiki.eclipse.org/Jetty/Feature/Continuations: Resuming a Request
TAG : java
Date : November 06 2020, 07:00 PM , By : user3856969
java.net.SocketTimeoutException: Read timed out
java.net.SocketTimeoutException: Read timed out
this one helps. You haven't given us much information to go on, especially about the client side. But my suspicion is that the client side is: failing to setting the Content-length header (or setting it to the wrong value), failing to flush the outpu
TAG : java
Date : November 06 2020, 07:00 PM , By : Irioth
Use Math class to calculate
Use Math class to calculate
hop of those help? If this is the source code verbatim, then there are quite a few issues here.First, The line:
TAG : java
Date : November 06 2020, 07:00 PM , By : Thiago Lopes
Portable Device Path on Windows
Portable Device Path on Windows
should help you out The solution to above problem using JMTP library on https://code.google.com/p/jmtp/Here is my code
TAG : java
Date : November 06 2020, 07:00 PM , By : CodeNaked
Java get user details
Java get user details
it should still fix some issue I'm new to Java and I have to write a program to get user details which appear like this: , Among other things, change this:
TAG : java
Date : November 06 2020, 07:00 PM , By : user3856697
Generics and wildcards in Java
Generics and wildcards in Java
Does that help The type of the variable declaration should match the type you pass in actual object type. So:
TAG : java
Date : November 05 2020, 07:01 PM , By : shine__wu
Processing XML file with Huge data
Processing XML file with Huge data
I hope this helps . Java's XMLReader is a a SAX2 parser. Where a DOM parser reads the whole of the XML file in and creates a (often large) data structure (usually a tree) to represent its contents, a SAX parser lets you register a handler that will b
TAG : java
Date : November 05 2020, 07:01 PM , By : Raoul Wernert
Question about Java File Reader
Question about Java File Reader
To fix this issue You can't. FileReader reads a character at a time or a line at a time. Obviously you can write your own code extending or wrapping it to skip to the unneeded lines.
TAG : java
Date : November 05 2020, 07:01 PM , By : user49394
Is there an updated javabean reflection library that includes generics?
Is there an updated javabean reflection library that includes generics?
I hope this helps you . I don't believe that there is any current library which allows reflection of Java generics. When Java generics were introduced in Java 1.5, they were implemented in the compiler but were not implemented in the VM. So you have
TAG : java
Date : November 05 2020, 07:01 PM , By : RedSunz
method implementation for this case in Java
method implementation for this case in Java
will be helpful for those in need I just saw a code snippet like this: , You would define the method like this:
TAG : java
Date : November 05 2020, 07:01 PM , By : striderFirstBorn
What Java concurrency classes might help me?
What Java concurrency classes might help me?
help you fix your problem Looks like a task for ReentrantReadWriteLock. Something like this:
TAG : java
Date : November 05 2020, 07:01 PM , By : user3856832
Problem with Java file locking mechanism (FileLock etc)
Problem with Java file locking mechanism (FileLock etc)
I wish this help you I am creating a simple application for opening and editing xml files. These files are located in a local folder accessed by multiple instances of the application. What I want to do is lock each file that is opened by an instance
TAG : java
Date : November 05 2020, 07:01 PM , By : MasterDebator
How to make a boolean variable switch between true and false every time a method is invoked?
How to make a boolean variable switch between true and false every time a method is invoked?
hop of those help? I am trying to write a method that when invoked, changes a boolean variable to true, and when invoked again, changes the same variable to false, etc.
TAG : java
Date : November 05 2020, 07:01 PM , By : Ramiro Aduviri Velas
How to print PDF file in a Java application?
How to print PDF file in a Java application?
I wish did fix the issue. How do I print a PDF file from a Java application? , Here some source code that will allow you print any text file:
TAG : java
Date : November 05 2020, 07:01 PM , By : user3856802
Separate log files for each web application and shared libraries with log4j
Separate log files for each web application and shared libraries with log4j
Hope this helps You can look at SL4J bridging. You can configure an application to re-route calls to log4j to sl4j, and then you can do what you like with them, you can configure them to come out in the same file, or whatever.There is a good article
TAG : java
Date : November 05 2020, 07:01 PM , By : Paloma
Why Timer does not work if we do not generate a window?
Why Timer does not work if we do not generate a window?
This might help you You're missing the point. The Timer is independent from the window you created and it works also when you comment out that window creation line.However, what you failed to see is: your main program exits after timer.start(), hence
TAG : java
Date : November 05 2020, 07:01 PM , By : user3856780
Why are so many new languages written for the Java VM?
Why are so many new languages written for the Java VM?
this one helps. There are more and more programming languages (Scala, Clojure,...) coming out that are made for the Java VM and are therefore compatible with the Java Byte-Code. , Why don't they write a new VM for a new language?
TAG : java
Date : November 05 2020, 07:01 PM , By : iamjoanne
java.lang.OutOfMemory error when fetching records from Database
java.lang.OutOfMemory error when fetching records from Database
I hope this helps . An answer is difficult without knowing the details of your system, but there are a few options: Increase memory for the JVM (see many other questions on SO) avoid processing all records at once; try grabbing a subset of your query
TAG : java
Date : November 05 2020, 07:01 PM , By : Taylor Monique
how to obfuscate the war file using proguard
how to obfuscate the war file using proguard
Hope this helps I'm puzzled by this question.As other Java obfuscators, Proguard obfuscates the compiled bytecode (.class files) by renaming every variable, method etc. it considers safe to rename. I suppose you know this and know how to use Proguard
TAG : java
Date : November 05 2020, 07:01 PM , By : user3856706
Problem loading R own created libraries in Java/JRI code
Problem loading R own created libraries in Java/JRI code
it fixes the issue You can modify the library path - see ?.libPaths in R, you simply want to add your private library to the path. The GUI does that for you, but if you are outside it doesn't happen. For example:
TAG : java
Date : November 05 2020, 07:01 PM , By : Youri
How do I send emails in Java?
How do I send emails in Java?
I hope this helps you . the library - commons-email, built ontop of the harder to use JavaMail the servers James - java based Postfix - for unix/linux (howto) many more - there are many smtp servers. Each requires some non-trivial configurations befo
TAG : java
Date : November 05 2020, 07:01 PM , By : Truc Nguyen
SOAP logging axis2
SOAP logging axis2
around this issue Try logging these two packages with DEBUG level: httpclient.wire org.apache.commons.httpclient
TAG : java
Date : November 05 2020, 07:01 PM , By : Mahesh Mahesh
Complex HashMap has different hashCode after serialization
Complex HashMap has different hashCode after serialization
will help you Hashcode of enum is not consistent across JVM instances. You can use hashcode of enum.toString() instead.
TAG : java
Date : November 05 2020, 07:01 PM , By : Kristoffel
How can I concatenate multiple rows in a matrix
How can I concatenate multiple rows in a matrix
Does that help In Java I would like to concatenate an array (a[], fixed length) to an array of the same length, to create a matrix M[2][length of a]. This way I would like to subsequently paste more of those arrays onto the matrix. (Comparable to the
TAG : java
Date : November 05 2020, 07:01 PM , By : user3856654
Open Source Iris Scanning Library in Java
Open Source Iris Scanning Library in Java
will be helpful for those in need I haven't used Java libraries that "just do" that entire work you describe, but it's not that difficult to use JavaVis (http://sourceforge.net/projects/javavis/) as in the sample code described in the following paper
TAG : java
Date : November 05 2020, 07:01 PM , By : fair_18
java System.nanoTime is really slow. Is it possible to implement a high performance java profiler?
java System.nanoTime is really slow. Is it possible to implement a high performance java profiler?
I hope this helps you . I've spent 10 years working on commercial Java performance profilers, for use in both development and production.The short answer is - yes, you're right. You can't pull that off. And even if you could, putting anything but tri
TAG : java
Date : November 05 2020, 07:01 PM , By : user3856638
Image Uploading in a web aplication
Image Uploading in a web aplication
Any of those help I would advise against saving images in the database. This usually gives poor performance since files work better from the file system, data in the database etc.It will also be harder to scale the database when the number of images
TAG : java
Date : November 05 2020, 07:01 PM , By : user3856595
Calling Java classes from IzPack
Calling Java classes from IzPack
wish of those help You can call static methods, but I don't think you can pass in parameters. You could create a new 'Condition type', but I have no experience with this so I can't confirm the flexibility it provides...So, I don't have a direct respo
TAG : java
Date : November 05 2020, 07:01 PM , By : Hunter Yelton
Find time taken to string S2
Find time taken to string S2
should help you out Big Edit Actually, by definition, the fact that S1 is a fixed length and does not depend on the input S2 means that @Amiy's answer is correct. Because indexOf runs only on S1, it will take at most a constant 26 steps. O(26n) = O(n
TAG : java
Date : November 04 2020, 07:01 PM , By : Adrian Ramos
Is there a better way to do an empty check in Java?
Is there a better way to do an empty check in Java?
hop of those help? You can use java.util.Optional in this way:
TAG : java
Date : November 04 2020, 07:01 PM , By : Alex
When Trying to Run Code, I get a "Does Not Have Main Method Error"
When Trying to Run Code, I get a "Does Not Have Main Method Error"
like below fixes the issue I'm very new to Java, and haven't learned much in my course. Every time I try running my code, I am told that I do not have a main method. However, I thought that public void main(String[] args) { declares the main method,
TAG : java
Date : November 04 2020, 07:01 PM , By : Oscar M
Possible without String?
Possible without String?
I hope this helps . I can’t solve this task without a string (don’t know yet) : , I don't know if i understan you but you can try:
TAG : java
Date : November 04 2020, 07:01 PM , By : Brynjar
Can I override and overload static methods in Java?
Can I override and overload static methods in Java?
will help you Static methods can not be overridden in the exact sense of the word, but they can hide parent static methodsIn practice it means that the compiler will decide which method to execute at the compile time, and not at the runtime, as it do
TAG : java
Date : November 04 2020, 07:01 PM , By : Simon Mduma
How to programatically insert image into Word document?
How to programatically insert image into Word document?
I wish this helpful for you I am just looking for that. Is it possible to insert image into MS Word document through Java? please reply....
TAG : java
Date : November 04 2020, 07:01 PM , By : Joseph Biancalana
actionlistener not responding in java calculator
actionlistener not responding in java calculator
this will help That's a lot of code!You don't actually create a ButtonListener let alone add one to a button.
TAG : java
Date : November 04 2020, 07:01 PM , By : Digbijay Mohanty
load class not in classpath dynamically in web application - without using custom classloader
load class not in classpath dynamically in web application - without using custom classloader
this will help You need a custom class loader to do this, and in this classloader you need to re-define a method findClass(String name)An example:
TAG : java
Date : November 04 2020, 07:01 PM , By : user3856482
In Swing, what is the best listener to use in a textarea
In Swing, what is the best listener to use in a textarea
To fix the issue you can do I am trying to change the font of the text in a textarea in Swing.
TAG : java
Date : November 04 2020, 07:01 PM , By : user3856456
Java. Writing a matrix in a file using column information. ( matrix transposition )
Java. Writing a matrix in a file using column information. ( matrix transposition )
To fix this issue Ok, after understanding the question, the algorithm I can think of is the next. Open the file Read a line from that file If you're in the first row -> 3.1 Create a file for the column being read Read a number from the current line S
TAG : java
Date : November 04 2020, 07:01 PM , By : Divy Jain Kamaldhwaj
Using RabbitMQ (Java client), is there a way to determine if network connection is closed during consume?
Using RabbitMQ (Java client), is there a way to determine if network connection is closed during consume?
like below fixes the issue In general, you're much better off posting questions regarding rabbitmq on the rabbitmq-discuss mailing list. We don't tend to track questions being asked outside of this.There is a heartbeat that you can configure, though
TAG : java
Date : November 04 2020, 07:01 PM , By : user3856405
requestRouteToHost android
requestRouteToHost android
With these it helps Looks like requestRouteToHost() is not implemented for WiFi. WifiStateTracker private class does not have requestRouteToHost() implementation. Instead, default implementation from base class NetworkStateTracker always returns fals
TAG : java
Date : November 04 2020, 07:01 PM , By : user3856389

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