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JAVA QUESTIONS

Why is it mandatory for ternary operations to return a value?
Why is it mandatory for ternary operations to return a value?
Hope that helps It's a matter of specification:
TAG : java
Date : December 05 2020, 12:24 PM , By : Vikas Gupta
How can I make my listview rows different heights
How can I make my listview rows different heights
it should still fix some issue Right now if there is a list item that is 2 lines in height then all the rows are two lines in height , why don't you try making the height = 0dp and weight 1
TAG : java
Date : December 05 2020, 12:24 PM , By : Alexander Tsybulsky
Array declaration trick : Is it bad to use it?
Array declaration trick : Is it bad to use it?
may help you . I am declaring this class, that doesn't to be useful. , Not much different from
TAG : java
Date : December 05 2020, 12:24 PM , By : warship
Calling different classes with if else statements
Calling different classes with if else statements
wish of those help I'm writing a java program that is like a physics lesson: , Use equals to compare strings like-
TAG : java
Date : December 05 2020, 12:24 PM , By : Abester
Free API for speech recognition system
Free API for speech recognition system
it helps some times I would suggest CMU's Sphinx system. See http://cmusphinx.sourceforge.net. It has tools to tune language and acoustic models, which can increase accuracy. There are multiple versions, but I would begin with PocketSphinx.
TAG : java
Date : December 05 2020, 12:18 PM , By : Umair
Java: Objects in JFrame are messed up
Java: Objects in JFrame are messed up
With these it helps I'm creating a simple Java JFrame in Eclipse with a label, 2 radio buttons with 2 textfields, and a JButton. When i run the program, the objects inside it are messed up, the buttons and textfields don't show up and sometimes a tex
TAG : java
Date : December 05 2020, 12:18 PM , By : desizombie
Is there a similar of MessageBox of ExtJS in ADF Faces
Is there a similar of MessageBox of ExtJS in ADF Faces
hope this fix your issue You can have a look at and then use an within it to get YesNo, OkCancel, YesNoCancel dialogs. Also you can add components like within an to get the popup showing the progress.
TAG : java
Date : December 05 2020, 12:18 PM , By : lisa stallings
Passing HttpServletResponse in Spring Boot controller method
Passing HttpServletResponse in Spring Boot controller method
I hope this helps . Better solution is to use @ResponseStatus for there is no real reason to add non-API arguments, such as HttpServletResponse or ResponseEntity in controller methods. Only path variables, request params, request body headers should
TAG : java
Date : December 01 2020, 04:55 PM , By : Matt
Failed to load libraries: [netty_tcnative_linux_arm_32, netty_tcnative_linux_arm_32_fedora, netty_tcnative_arm_32, netty
Failed to load libraries: [netty_tcnative_linux_arm_32, netty_tcnative_linux_arm_32_fedora, netty_tcnative_arm_32, netty
This might help you Netty itself does not support its native libraries on arm platform. This is why you get the error. You will need to not use the native SSL lib provided by netty-tcnative.
TAG : java
Date : December 01 2020, 04:55 PM , By : Stevo le Tsamby
How to build a small documents storage?
How to build a small documents storage?
may help you . Why not use JackRabbit, which is a JSR-170 compliant Java document store ?
TAG : java
Date : December 01 2020, 04:55 PM , By : Devin Acker
Getting pixel position of a text in an image
Getting pixel position of a text in an image
To fix the issue you can do If I understood you right you want to move your mouse and click on the screen. That not that hard you could use the robot class from Java!For example:
TAG : java
Date : December 01 2020, 04:55 PM , By : sreejith pulickal
How do I get a list of Methods called from a Class in Eclipse IDE?
How do I get a list of Methods called from a Class in Eclipse IDE?
To fix the issue you can do If you need to list only the method being used, there is no in-language way to achieve that. Though there might be some coverage tools which can handle this.But If its about all the available methods, you can use reflectio
TAG : java
Date : December 01 2020, 04:55 PM , By : Milton Lenis
Convert string to day of week (not exact date)
Convert string to day of week (not exact date)
I wish this help you You can use SimpleDateFormat it can also parse the day for a specific Locale
TAG : java
Date : December 01 2020, 04:55 PM , By : HARSHA MAGANTI
Unable to understand how rounding is working for decimal digits (Java)
Unable to understand how rounding is working for decimal digits (Java)
fixed the issue. Will look into that further It's because of the way floating point numbers are stored in memory. The value 1091.225, and 1091.255d, don't have exact binary representation. Try printing their value using the below statements:
TAG : java
Date : December 01 2020, 04:55 PM , By : Savannah Danford
How to avoid java.lang.NoSuchMethodError: org.apache.poi.util.IOUtils.copy(Ljava/io/InputStream;Ljava/io/OutputStream;)
How to avoid java.lang.NoSuchMethodError: org.apache.poi.util.IOUtils.copy(Ljava/io/InputStream;Ljava/io/OutputStream;)
To fix the issue you can do I got this error today: "java.lang.NoSuchMethodError:org.apache.poi.util.POILogger.log(I[Ljava/lang/Object;)V]"It looks different from your error, but quite similar. FYI, I'm using maven to manage jars. After some experime
TAG : java
Date : December 01 2020, 04:55 PM , By : John
JTable Renderer not working with RowSorter?
JTable Renderer not working with RowSorter?
fixed the issue. Will look into that further Absent an sscce, two several things stand out:
TAG : java
Date : December 01 2020, 04:55 PM , By : Vasil Levski
From java.util.concurrent.Future<T> to play.libs.F.Promise<T>: How to do that in Java?
From java.util.concurrent.Future<T> to play.libs.F.Promise<T>: How to do that in Java?
hope this fix your issue There is no way to non-blockingly/non-pollingly transform an arbitrary j.u.c.Future into an async Future/Promise. Try it and see for yourself :)
TAG : java
Date : December 01 2020, 04:55 PM , By : Orlando Amorim
jUnit tests work in Eclipse, but fail in ant - java.lang.RuntimeException: Stub
jUnit tests work in Eclipse, but fail in ant - java.lang.RuntimeException: Stub
To fix the issue you can do The problem occurs when the android.jar is referenced before the junit.jar in the classpath.In your build.xml, the order seems correct, but you specified the id with a space in it:
TAG : java
Date : December 01 2020, 04:55 PM , By : ChessPlayer
How do i add a tooltip to existing gwt Textbox?
How do i add a tooltip to existing gwt Textbox?
will be helpful for those in need my application is using eclipse with gwt plugin included. Currently it has a simple textbox without tool tip functionality. , You can do this easily in GWT - use the setTitle() method:
TAG : java
Date : December 01 2020, 04:55 PM , By : ACIDITYRAIN
actor replying to non-actor
actor replying to non-actor
fixed the issue. Will look into that further This should work just fine. When you use ask, a lightweight actor (I believe represented by a PromiseActorRef) is created to represent the sender so that a response can be sent back that will complete the
TAG : java
Date : December 01 2020, 04:55 PM , By : kidfrommars
Google Cloud Messaging - server connection
Google Cloud Messaging - server connection
To fix the issue you can do Ok I encountered the same problem and I fixed it by looking for some firewall rules. Maybe you can try to add a rule to grant access from inside to gcm.googleapis.com.
TAG : java
Date : December 01 2020, 04:55 PM , By : analpaper
Which classes are unmodifiable and cannot be intrumented and is there a way to bypass it?
Which classes are unmodifiable and cannot be intrumented and is there a way to bypass it?
will be helpful for those in need When trying to instrument classes such as java.util.ArrayList, I was getting java.lang.instrument.UnmodifiableClassException. , You should call isModifiableClass on your instrumentation
TAG : java
Date : December 01 2020, 04:55 PM , By : Tim Turner
Java & Jersey 1.17: Custom default response headers
Java & Jersey 1.17: Custom default response headers
will help you I don't think jersey provides this feature but you can achieve this by writing a Servlet Response Filter. Learn more about servlet filters here: http://punekaramit.wordpress.com/2010/03/16/intercepting-http-response-using-servlet-filter
TAG : java
Date : December 01 2020, 04:55 PM , By : HHicker
Java rounding error
Java rounding error
will help you The Mathround method is not broken. 138.515 can't be exactly represented as a double. To see the exact value, you can use:
TAG : java
Date : December 01 2020, 04:55 PM , By : sumanth
Setting custom RejectedExecutionHandler for ThreadPoolExecutor after executing some tasks?
Setting custom RejectedExecutionHandler for ThreadPoolExecutor after executing some tasks?
hope this fix your issue The question should be "Should we handle the RejectedExecutionException?". The answer is of course yes. Not doing so will crash the thread in which it occurs i.e. the thread submitting the task for execution, and the applicat
TAG : java
Date : December 01 2020, 04:55 PM , By : Xinyu Wang
Arquillian test class variables lose value
Arquillian test class variables lose value
I wish this help you Junit does not allow to share the variables between/among test cases. During execution, each test case will have its own local copy of the variables. The rationale behind such a design is simple that test cases should not depend
TAG : java
Date : December 01 2020, 04:55 PM , By : Robert Hughes
java.util.ConcurrentModificationException while inserting in ArrayList
java.util.ConcurrentModificationException while inserting in ArrayList
like below fixes the issue It happens due to array list is modified after creation of Iterator.
TAG : java
Date : December 01 2020, 04:55 PM , By : user4642535
How to write generic Java API without method Overloading
How to write generic Java API without method Overloading
This might help you Varargs are fine when they are needed, though in this case I think it would be better to have a setter for the connection.To make this shareable across threads you can use
TAG : java
Date : November 29 2020, 01:01 AM , By : DreJoh
Java Serialization / Deserialization of an ArrayList works only on first program execution
Java Serialization / Deserialization of an ArrayList works only on first program execution
To fix this issue That's exactly that, nothing is overwritten, since you explicitely chose to append rather than overwrite when writing to the file:
TAG : java
Date : November 29 2020, 01:01 AM , By : D. Tupper
Conway's Game of Life's rules dont apply properly
Conway's Game of Life's rules dont apply properly
should help you out In Conway's Game of Life the cells must not be updated in-place. Instead, your function nextGeneration should use the values of the current grid and write the result into a different grid.
TAG : java
Date : November 29 2020, 01:01 AM , By : Ibiyemi Olagoke Kay
call a java method when Click on a html button without using javascript
call a java method when Click on a html button without using javascript
seems to work fine You're misunderstanding how server-side programming works. When you load that page, the webserver will get to the line and will immediately parse and execute the JSP snippet, in your case po.killThread(), and replace everything bet
TAG : java
Date : November 29 2020, 01:01 AM , By : DydBoy
Why does SSLSocketFactory.createSocket returns a Socket instead of SSLSocket?
Why does SSLSocketFactory.createSocket returns a Socket instead of SSLSocket?
I hope this helps . Because createSocket method is inherited from SocketFactory. It's impossible to override result type.There could be a way around it using generics, but that would break existing API and all existing code.
TAG : java
Date : November 29 2020, 01:01 AM , By : Acie Clayborne
How to schedule a task in Tomcat
How to schedule a task in Tomcat
will be helpful for those in need Actually, the best way to schedule task in Tomcat is to use ScheduledExecutorService. TimeTask should not be used in J2E applications, this is not a good practice.Example with the right way :
TAG : java
Date : November 29 2020, 01:01 AM , By : Chris Rovin
compare two pdf files (approach) using java
compare two pdf files (approach) using java
I wish this help you I had to compare tons of pdf files in my project. my requirement was to compare the pdf files by pixel by pixel. After a lot of googling and as i could not find anything good, I ended up creating my own pdf utility for this purpo
TAG : java
Date : November 29 2020, 01:01 AM , By : SillyLossy
What is the use of allowCoreThreadTimeout( ) in ThreadPoolExecutor?
What is the use of allowCoreThreadTimeout( ) in ThreadPoolExecutor?
Any of those help This method allows you to specify whether to terminate the core thread if there is no incoming task within the thread keep alive time. This is related to other configuration like, setCorePoolSize(), setKeepAliveTime(..)When you are
TAG : java
Date : November 29 2020, 01:01 AM , By : Nick B UK
Describe the Strategy Design Pattern in Java?
Describe the Strategy Design Pattern in Java?
I hope this helps . Consider java.util.Comparator. It defines the way two objects are compared. A TreeSet created with different implementations of Comparator will sort elements in different ways. Another example from Java SE is java.util.concurrent.
TAG : java
Date : November 29 2020, 01:01 AM , By : Ashish S Vaidya
MongoDB too many open connections
MongoDB too many open connections
will help you I am running Mongo with 1 shard, 10 Mongo servers and about 1K java clients.
TAG : java
Date : November 29 2020, 01:01 AM , By : techiegeek
Issue with generate JAXB classes with value constructors
Issue with generate JAXB classes with value constructors
this one helps. Using Java 7(no porobem when use java1.5), I had a similiar problem, solved by using "com.sun.tools.xjc.XJC2Task" in taskdef, ieInstead of
TAG : java
Date : November 29 2020, 01:01 AM , By : Lamp
Moving from one frame to another in java swing
Moving from one frame to another in java swing
wish helps you Having multiple JFrame instances in one application is bad usability Consider using something like a CardLayout instead.
TAG : java
Date : November 29 2020, 01:01 AM , By : JSCSD
Get a thread by Id
Get a thread by Id
I hope this helps . I worked in JMX java and I get all the thread IDs by using the getAllThreadIds () method of the interface ThreadMXBean but I need a way to kill the thread of a given ID. for example: , You can try this:
TAG : java
Date : November 29 2020, 01:01 AM , By : Josh York
how to open front camera and back camera at same time?
how to open front camera and back camera at same time?
will help you First You are not creating any new object of Camera explicitly. You are using singleton method of Camera. So there will be only one instance in memory.
TAG : java
Date : November 29 2020, 01:01 AM , By : Frank Purnell
Messed up with Java Declaration
Messed up with Java Declaration
I wish this help you You cannot put literals ('a') in the middle of identifiers.The line
TAG : java
Date : November 29 2020, 01:01 AM , By : Tony Kim
Extracting chart in EXcel as image using java
Extracting chart in EXcel as image using java
I wish this helpful for you You can convert or copy charts(graphs) using J XL or Aspose Cells(Aspose is not free).This is the code snippet to extract excel chart to image
TAG : java
Date : November 29 2020, 01:01 AM , By : Marcie
How to get latitude and longitude in Android phone?
How to get latitude and longitude in Android phone?
Any of those help Google Longitude was something else. The location API uses LocationManager and has never been deprecated.
TAG : java
Date : November 29 2020, 01:01 AM , By : Walter Oresto
Do GC pauses and kill -STOP produce the same behavior?
Do GC pauses and kill -STOP produce the same behavior?
it should still fix some issue There certainly is a difference. At the very least, the garbage collector is operating and parsing objects during a GC pause, and it is not doing so during a kill -STOP.Furthermore, the garbage collector will be calling
TAG : java
Date : November 29 2020, 01:01 AM , By : Sven Tantau
Android HTML.ImageGetter Images resized
Android HTML.ImageGetter Images resized
I wish did fix the issue. I have a TextView which load a HTML content (which has img tags as well). My problem is that some images are too big so the app crashes. Is there any way to make the images to be all to the same size ? , Use this code instea
TAG : java
Date : November 29 2020, 01:01 AM , By : punk_russian
The way to instantiate map<String, List<String>> in Java
The way to instantiate map<String, List<String>> in Java
this will help I would like to instantiate Map in Java,
TAG : java
Date : November 29 2020, 01:01 AM , By : Макс Авдеев
Java Making objects move while buttons held
Java Making objects move while buttons held
it helps some times There are a number of important considerations that you need to take into consideration. Buttons aren't designed to work this way. They are designed to trigger and action event when they are clicked (pressed and released), so you
TAG : java
Date : November 29 2020, 01:01 AM , By : zcaad9
Androidx Navigation View - `setNavigationItemSelectedListener` Doesn't Work
Androidx Navigation View - `setNavigationItemSelectedListener` Doesn't Work
around this issue I Figured it out guys.Just in case if someone needs it, I'm posting it here.
TAG : java
Date : November 28 2020, 08:01 AM , By : Reimu Hakure
after compiling code JFrame does not appear
after compiling code JFrame does not appear
I wish did fix the issue. I'm using the Intellij idea platform. , You should do something like this:
TAG : java
Date : November 28 2020, 08:01 AM , By : Dawid Bobyla
Netbeans project, JFrames ran from the main JFrame close all JFrames in project
Netbeans project, JFrames ran from the main JFrame close all JFrames in project
Hope this helps I think you have .setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); on the inner JFrame object, but you haven't provided enough code to know for sure.If that's the case, you want to change it to DISPOSE_ON_CLOSE.
TAG : java
Date : November 28 2020, 08:01 AM , By : keithka
Square Retrofit Client: How to enable/disable followRedirects? How to intercept redirect URL?
Square Retrofit Client: How to enable/disable followRedirects? How to intercept redirect URL?
wish of those help I'm using Square's Retrofit Client to make simple requests from an Android App. Like so: , With OkHttp:
TAG : java
Date : November 28 2020, 08:01 AM , By : Jeff-VBS
Java Circular Reference - Can’t Compile
Java Circular Reference - Can’t Compile
this one helps. File: A.java , They should compile fine if you compile them both at once:
TAG : java
Date : November 28 2020, 08:01 AM , By : Islam Ahmed
Mouse click on specific time JAVA
Mouse click on specific time JAVA
this one helps. Your question shows zero ability to google and zero intentions of searching for information yourself. I won't play into that by giving you complete code...You use the java.awt.Robot class to do mouse clicks.
TAG : java
Date : November 28 2020, 08:01 AM , By : Sandy
android 4 onCreateDialog return type incompatible when overriding
android 4 onCreateDialog return type incompatible when overriding
To fix the issue you can do You need a default return block in your switch or a return after the switch. You can return null in those cases.
TAG : java
Date : November 28 2020, 08:01 AM , By : Jonas Oliveira Barbo
Java Implementation of Oracle's DBMS_UTILITY.GET_HASH_VALUE Function
Java Implementation of Oracle's DBMS_UTILITY.GET_HASH_VALUE Function
seems to work fine Oracle doesn't detail the implementation of the hash, and Tom Kyte has indicated that the implementation can change release to release. If you are looking for a hash function you can use in Java and Oracle, you can do SHA1 (and oth
TAG : java
Date : November 28 2020, 08:01 AM , By : SunFlower S
javac cannot be run, and furthermore does not seem installed
javac cannot be run, and furthermore does not seem installed
I think the issue was by ths following , The JRE is merely the Java Runtime Environment, which includes only the infrastructure needed to run Java programs that are already compiled.To compile Java source code using javac, you need the Java Developme
TAG : java
Date : November 28 2020, 08:01 AM , By : ankita
Function to obtain a thread given its ID
Function to obtain a thread given its ID
should help you out No, there is no such provision in Java, but it is easy enough to implement it yourself: each time you create a new thread and give it an ID, add it to a Map. Then you can look up your thread there.
TAG : java
Date : November 28 2020, 08:01 AM , By : bersy
Java File path to Executable has spaces
Java File path to Executable has spaces
To fix the issue you can do EDIT: By far the most reliable way is to use Runtime.exec(String[] cmdarray).
TAG : java
Date : November 28 2020, 08:01 AM , By : ankita
Minimum Oracle Java VM heap memory setting?
Minimum Oracle Java VM heap memory setting?
wish help you to fix your issue Is there a minimum -Xmx setting for Oracle's JVM? It looks like -Xmx2M does provide the application with more than 2 MB of heap size, as the Java Memory MX bean tells me it allocates like 10 MB... , If I run
TAG : java
Date : November 28 2020, 08:01 AM , By : MechDev

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