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Java : In my JavaFx application , I want to call a method when the main frame gains focus . However , I want to react only in the case where the focus was outside my application and came back ( not when a dialog closes for example ) .When the application was in Swing , I could use the method ( which corresponds to the ... | Equivalent of FocusEvent.getOppositeComponent in JavaFx |
Java : Consider the below scenario : Code:1Commenting the code as below , there are no errors and following output has been displayed.Code:2Output-If the execution is based on the order in which static variables or blocks have been written.why compilation error is not thrown for the initialization ( b=5 ) as shown in C... | How the order of execution is performed between static variables and blocks ? |
Java : There was a question asked : `` Presented with the integer n , find the 0-based position of the second rightmost zero bit in its binary representation ( it is guaranteed that such a bit exists ) , counting from right to left . Return the value of 2position_of_the_found_bit . `` I had written below solution which... | How bit manipulation works ? |
Java : My class GraphicButton.java creates a custom JButton with a certain text and font and a rectangular border . My problem is that there is some extra space between the last character in the string and the end of the border that I would like to remove.Here is what an instance of a GraphicButton looks like with the ... | How to remove the space from the end of a string displayed with Graphics in Java ? |
Java : I have the following codeI am expecting the output to be false , true , true , false and true.However , the output is false , true , false , false , false.I am looking for how the output is false for the 3rd and 5th case . What is the behavior of HashMap containsKey ? Why is the output false even though the Key ... | Java HashMap containsKey |
Java : What do parenthesis do in Java other than type casting.I 've seen them used in a number of confusing situations , here 's one from the Java Tutorials : I only know only two uses for parenthesis , calls , and grouping expressions . I have searched the web but I ca n't find any more information.In the example abov... | Unexplained parenthesise in Java |
Java : This is the line where crash occursThe values I got by catching the Exception and dumping the variables , The variable TreeMap < Long , Long > offsets is parsed from a json file by using the code below.After examining the code many times , I ca n't identify a situation where this code can throw a Any ideas ? Upd... | Werid ClassCastException in TreeMap.containsKey ( ) |
Java : I have the following codes : What I want its output format would be : However , given the above codes , it results to : How do I get rid of the delimiter , as the first character in every line ? Thank you . <code> StringJoiner stringJoiner = new StringJoiner ( `` , '' ) ; List < Person > persons = Arrays.asList ... | StringJoiner remove delimeter from first position for every line |
Java : I 'm working a project to replace a Resource Management system ( QuickTime Resource Manager on Mac and Windows ) that has been deprecated and I have been using the current model that Qt uses where data is retrieved from the resource file using a string key.For example , I may have an image in my resource file , ... | Why are string identifiers used to access resource data ? |
Java : I am new to python recently . Previously all my programming knowledge are limited on Java . So here I have a question about object variables in Python . I know that object variables in Python share on class instances . For example.So my questions is that how many memory copies does A.list have ? only 1 or just a... | How many memory copies do object variables in Python have ? |
Java : I have a hashmap which has key value pair of String and object . It is the conversion of something like below json . But , I am not converting to map . I have just that map . If this may has key and value , I have to do write some logic based on that value . I implemented as below : Now , I wanted to avoid the n... | avoid nested if in hashmap which is created from complex json |
Java : I would like to write a program in Java which , given an array , finds the sum of all the numbers in the array - with an exception ! Since the number 13 is very unlucky , I propose that we shall completely exclude the number 13 , and the number directly after 13 , if it exists , from the total sum.The program , ... | Finding the sum of numbers in an array - excluding the number 13 and the number directly after it |
Java : The author of java 8 in action writes this class : Then he talks about what different values in Characteristic enum mean . And then he explains why this collector he wrote is IDENTITY_FINISH and CONCURRENT and not UNORDERED , saying : The ToListCollector developed so far is IDENTITY_FINISH , because the List use... | Confusion about Characteristics.UNORDERED in Java 8 in action book |
Java : I code a mini Android game scenario inspired by Space Invaders and Moon Patrol . It is possible to shoot an alien horizontally ( see above ) . It is also possible to shoot an alien vertically ( see below ) . But adding aliens does n't `` scale '' , it will be very difficult to add for instance 15 aliens moving w... | Improve movement of space aliens |
Java : Sorry guys I am new to Java and I have an issue with my code . I have read through the threads and have seen many examples regarding this specific error ( java.lang.NoSuchMethodError : main Exception in thread `` main '' ) . I just cant seem to wrap my head around where I would add ( static void main ( String [ ... | Having trouble with MAIN please advise |
Java : I have a string which contains a series of bits ( like `` 01100011 '' ) and some Integers in a while loop . For example : Now I want a nice fastest way to convert string and int to byte array . Until now , what I have done is convert int to String and then apply the getBytes ( ) method on both strings . However ... | Java Byte Array conversion Issue |
Java : I have code that consumes a large number ( millions currently , eventually billions ) of relatively short ( 5-100 elements ) arrays of random numbers and does some not-very-strenuous math with them . Random numbers being , well , random , ideally I 'd like to generate them on multiple cores , since random number... | High-performance buffering for a stream of rands |
Java : I 'm trying to create a program to compare the amount of time it takes various haskell scripts to run , which will later be used to create graphs and displayed in a GUI . I 've tried to create said GUI using Haskell libraries but I have n't had much luck , especially since I 'm having trouble finding up to date ... | Getting the results of a Haskell script from Java |
Java : I have multiple time series : Frustratingly in my dataset there is n't always a matching date in both series . For scenarios where there is one missing I want to use the last available date ( or 0 if there isnt one ) .e.g for 2017-01-03 I would use y=3 and x=1 ( from the date before ) to get output = 3 + 1 = 4I ... | Java : Sum two or more time series |
Java : I 'm learning Java in school right now and our latest topic are sort algorithms in Java . The one that I 'm trying to understand is quicksort.To understand how that algorithm sorts numbers in an array I decided to go through my code step for step in the Eclipse debugger window.Now there was one step that I can n... | Java Quicksort why / where do the values change ? |
Java : I want to publish or advertise my device name over WiFi , which is variable and can be changed by user.For example , Take a file transfer application Xender . We can see the device name set by users on screen when we select receive option in the app . Here is screen shot.You can see in the image that name shah.k... | How to publish device name ( Variable ) over WiFi , as some File transfer applications do ? |
Java : Is it really possible to view partially constructed object in the thread created in the constructor because of the lack of synchronization and the leaking this instance ? Except for the case when there is a child class , of course , or we are doing implicit construction with clone or something like that - so let... | Does happens before Program order rule work in constructors ? |
Java : I have a temperature record something like thisI have to parse this into a POJO and calculate the average delta as per the following problem statement : Use the Streams API to calculate the average annual temperature delta for each country . To calculate delta the average temperature in 1900 would be subtracted ... | Java 8 Streams multiple grouping By |
Java : I have an issue which I hope I will solve by writing this question but if not I will post and see if anyone can help.I am using a client library ( which is poorly written I feel ) to interact with a real time chat server that utilises COMET style long-polling over HTTP . I 'm having issues with cancelling the lo... | Concurrency issue for cancellation of long-poll loop |
Java : I am facing this problem for 2 hours.The problem is I have other classes that are working well . I do n't know why this error is happening for the current class.But the code works for other tables ( other classes ) .It was working so fine until today . Is there anyone that faced this problem before ? I got this ... | Unable to obtain isolated JDBC connection : org.hibernate.exception.JDBCConnectionException |
Java : I have a problem using JXSE.Let 's say i have a rendezVous peer and an Edge peer , not on the same local network.The rendezVous peer create a peerGroup `` test '' , and publish an advertisement in this group with the name `` test advertisement '' Let 's say i 'm sure than my EdgePeer is connected to the rendezVo... | Join existing PeerGroup in JXTA/JXSE |
Java : I was testing some Java8 streams API codes , but i ca n't figure out what is happening with this one.I was thinking about ParallelStream and how this works and i made some comparisons.Two different methods that do a big iteration adding 32.768.000 BigDecimals , one using ParallelStream , other using normal itera... | Java8 streams strange behavior |
Java : Possible Duplicate : Questions about Java 's String pool Recently I read a java article and found the following statement `` improved the String pooling technology in java 6 onward '' . One of the example that they have mentioned as followsNumber of objects created by above example is = 1Here I am little confuse... | How many string objects will be created by JVM version 1.6 |
Java : I 'm coming from Python , and trying to understand how lambda expressions work differently in Java . In Python , you can do stuff like : How can I accomplish something similar in Java ? I have read a bit on Java lambda expressions , and it seems I have to declare an interface first , and I 'm unclear about how a... | How to map lambda expressions in Java |
Java : In Android , I can monitor if certain events are triggered through the use of Broadcast Receivers . Are there any tools which let me view ALL events on an android device I am debugging instead of having to add a broadcast receiver to listen to them ? For example , in a Broadcast receiver , I can monitor for a ca... | Monitor All Android Devices events remotely |
Java : Using the code of a question I just answered as an exampleStarting with the string What if we wanted to replace the space after every four-digit number with an @ such that you end up with something like this : How much more efficient is it to use a back-reference rather than a positive lookbehind ( if at all ) ?... | Is it more efficient to use a positive look-behind or a back reference ? |
Java : I have a List of A , To execute filtering I need to map A to B . But once the filtering logic is done I still need A for further operations , So My question is would it be at all possible to achieve this ? One approach I can think of is storing both A and B into a third type , so I have both available , while pr... | Storing/Reusing intermediate results on a java 8 stream |
Java : andSpecifically , I 'm not clear as to why synchronized is required in the second instance when a synchronized list provides thread-safe access to the list . <code> List < String > list = new ArrayList < String > ( ) ; list.add ( `` a '' ) ; ... list.add ( `` z '' ) ; synchronized ( list ) { Iterator < String > ... | What is the difference in behavior between these two usages of synchronized on a list |
Java : Given list like : List < String > names = Lists.newArrayList ( `` George '' , `` John '' , `` Paul '' , `` Ringo '' ) I 'd like to transform it to a string like this : George , John , Paul and RingoI can do it with rather clumsy StringBuilder thing like so : Is there a bit more elegant approach ? I do n't mind u... | How to join items of list , but use a different delimiter for the last item ? |
Java : I just performed a quick experiment in Eclipse.When the method-reference test fails , the trace beginsThere is no reference back to the line on which the method reference is used although the end of the trace ( not shown ) does link back to line with findFirst on.While the lamdba stacktrace beginsWhich correctly... | Are stack traces less navigable when using method references vs lambdas ? |
Java : I new to java so bear with me if this is a ridiculously simple question but I am curious about this method call which has { code } being taken in - see code below for an example in the method addSelectionListener . What is the purpose of this ? I have been looking through docs for an explaination but cant seem t... | What does that Java construct do ? |
Java : I have a following query where I join tables A , B , and C : C is related to B via C.B_IDB is related to A via B.A_IDI want to retrieve a report , where for each C , I want to retrieve also fields from corresponding B and A.If only a subset of fields is required , a projection and fetching to a POJO ( with requi... | JOOQ Howto fetch a result of join into POJO without flattening properties ? |
Java : According to https : //developer.android.com/training/data-storage/room/relationshipsWe can have one-to-many relationshipsIn both entity User and Playlist , we have added a column named sort_keyThe purpose is , when we perform query , we can do the followingWe can control the order of List < UserWithPlaylists > ... | Is there a way to control the order of child entity , when using one-to-many relationhips ? |
Java : I am getting stuck and do n't know where to look further.I have a Java application and one of its functionality is to grab some specific windows ( ie third party application windows ) and host them within itself ( with some extra frames , etc ... ) The whole thing works great , except when my Java application ge... | Xlib : Adding a window to the save-set using XAddToChangeSet does not work from Java/JNI |
Java : If I am working with Java streams , and end up with an IntStream of code point numbers for Unicode characters , how can I render a CharSequence such as a String ? I have found a codePoints ( ) method on several interfaces & classes that all generate an IntStream of code points . Yet I have not been able to find ... | Make a string from an IntStream of code point numbers ? |
Java : In a method I have this : I do n't understand why it produces compilation error . The error says that x is not final or effectively-final , so it ca n't be accessed from the lambda body . There is no modification to x after the doLater call , so the value of x is actually already determined when doLater is calle... | Why is a local variable in Java not considered `` effectively final '' even though nothing modifies it afterwards ? |
Java : Considering the following Java code : And now let 's try to do the same in C # The Java example outputI 'm bI 'm bThe C # version outputI 'm aI 'm bIs there a way to implement class b so that it prints `` I 'm b '' twice ? Please notice i 'm not looking at a way to change a . <code> public class overriding { pub... | How to achieve same override experience in C # as in Java ? |
Java : I want to get Bitmap from drawable resource id , I found a solution to decode it using BitmapFactory decode method , but it 's giving null . <code> Bitmap bitmap = BitmapFactory.decodeResource ( getResources ( ) , R.drawable.ic_tick ) ; | Decoding bitmap from Drawable Resource Id is giving null |
Java : I am programmatically creating textviews with horizontal lines between each view . Using a drawable created programmatically.The problem is , the opacity starts off light and gradually increases for each line.I 've logged the opacity ( getAlpha ( ) ) of the drawable , paint , image view and linear layout at all ... | Incremental Opacity , wanting constant opacity Image View with Drawable |
Java : What is the best way to convert Integer array to int array . The simple solution for it would be : In the above example I taken 0 for null values for the fact that default value for objects/wrappers is null and for int is 0.This answer shows how to convert int [ ] to Integer [ ] But I do n't find an easy way to ... | What is the best way to convert Integer [ ] to int [ ] |
Java : ( I 'll use T to refer to a generic argument here , used in a parameterized class . ) I read that the reason that T ... is a potential source of heap pollution when used as an argument is that the compiler is making an exception to the normal ( no T [ ] arrays allowed ) rule , and allowing T ... ( which is varar... | Is T ... ( generics vararg parameter ) really stripped down to Object [ ] at compile time ? |
Java : I am still learning about generics and have a question . Say you had this generic class : All the statements compile but I do n't really know what makes them different . Can anyone give me a brief explanation on those three statements . <code> public class Test < T > { public static void main ( String [ ] args )... | What is the difference between these statements in a generic class ? |
Java : I want to optimize this solution ( idiomatically ) .I have a string containing only integer values . I want to convert this string into reverse int array . The output should be an integer arrayHere is my solution : Please suggest how to do same . <code> private static int [ ] stringToReversedIntArray ( String nu... | Convert string to reverse int array |
Java : The following code uses simple arrays of String in Java.In the above code snippet , we can initialize arrays like this.and we can directly pass it to a method without being assigned like this.If it is so , then the following statement should also be valid.but the compiler complains `` Illegal start of expression... | Passing arrays as method parameters in Java |
Java : I 'm new to Java and I have come to having the following problem : I have created several classes which all implement the interface `` Parser '' . I have a JavaParser , PythonParser , CParser and finally a TextParser.I 'm trying to write a method so it will take either a File or a String ( representing a filenam... | How should I return different types in a method based on the value of a string in Java ? |
Java : I have the following 2 methods overloaded in a class : When I invoke the method testMethod it print `` String '' .When I add one more overloaded method : It throws me compiler error : The method testMethod is ambigous for type Test..All this happens when I invoke the method with nullMy questions are : Why it pri... | Method overloading and passing null |
Java : I 'm having trouble following the below code snippet : I know what the result of the code is and it 's correct in unit tests , but I 'm not overly familiar with guava or how/why this implementation works . Also currently it does n't appear to be safe if there is a null value in the list 'prices ' either ? So wha... | Strange looking guava code |
Java : I have a splash screen and a menu screen class that loads all my texture atlases and skins for the menu and processes lots of stuff . If I put the constructor for the menu screen in the SplashScreen constructor or in the create ( ) method of my main game class ( MyGame class ) then it would pass a lot of time wi... | Game crash if interrupted while Splash Screen is on - LIBGDX |
Java : In Java 8 , java.lang.Thread class got 3 new fields : as it said in Javadoc for being exclusively managed by class java.util.concurrent.ThreadLocalRandom.Furthermore , in ThreadLocalRandom they are used in very freakish way : ( the same code piece can be met also in LockSupport class ) .and then this offsets are... | New additional fields in java.lang.Thread , what is the idea ? |
Java : I compiled following code using Java-8 compiler : I compiled the above code using Java-8 compiler as : Version of my default Java Interpreter : And I can run the compiled code using Java-9 interpreter without any error.According to my knowledge : At runtime the package `` pack '' will be contained inside a speci... | How is Java 9 running code compiled with Java 8 that is using a non-exported package |
Java : First code : distance is called very often . When I compiled it with javac and then decompiled with javap -c I got this bytecode : It seems that javac has n't optimized second function , distance.Second code , I think , faster : And its bytecode : Is invokestatic so fast that it 's the same as inlining static fu... | Static functions inlining in Java |
Java : Here 's my code : Here 's my output : My understanding is that increment is synchronized . So , it should first increment one number and then release the lock and then give the lock to the thread t1 or t2 . So , it should increment one number at a time , right ? But why is my code incrementing two or three numbe... | Why is synchronized not working properly ? |
Java : If do not call System.gc ( ) , the system will throw an OutOfMemoryException . I do not know why I need to call System.gc ( ) explicitly ; the JVM should call gc ( ) itself , right ? Please advise.The following is my test code : As following , add -XX : +PrintGCDetails to print out the GC info ; as you see , act... | OutOfMemoryException despite using WeakHashMap |
Java : Following is my codeThe error occurs at c.acceptParameterOfTypeA ( this ) ; .The error is The method acceptParameterOfTypeA ( A2 ) in the type C is not applicable for the arguments ( A ) From what I see , the method acceptParameterOfTypeA expects a parameter of type A , and this at the line giving the error is o... | Why Does the following code with Cyclic Generics not compile ? |
Java : The question is about java.util.stream.Stream.reduce ( U identity , BiFunction < U , ? super T , U > accumulator , BinaryOperator < U > combiner ) method.One of the requirements is that the combiner function must be compatible with the accumulator function ; for all u and t , the following must hold : If the com... | Example of stream reduction with distinct combiner and accumulator |
Java : My Java textbook says that you can use the following code to randomly shuffle any given array : Would the following code that I wrote would be equally efficient or valid ? I tested my code and it does shuffle the elements properly . Is there any reason to use the textbook 's algorithm over this one ? <code> for ... | Is there any difference between the following algorithms for shuffling arrays ? |
Java : Here 's snippet from java.util.ArrayList : Here 's snippet from com.google.collect.Preconditions : May somebody shed light on : why private outOfBoundsMsg is requiredmeaning of `` this outlining performs best ... '' should I start refactoring my code to include string returning methods for my exception construct... | Why is there private method outOfBoundsMsg in java.util.ArrayList ? |
Java : The JavaFX docs state that a WebView is ready when Worker.State.SUCCEEDED is reached however , unless you wait a while ( i.e . Animation , Transition , PauseTransition , etc . ) , a blank page is rendered.This suggests that there is an event which occurs inside the WebView readying it for a capture , but what is... | When is a WebView ready for a snapshot ( ) ? |
Java : I 'm confused by the Java spec about how this code should be tokenized : The spec says : The longest possible translation is used at each step , even if the result does not ultimately make a correct program while another lexical translation would.As I understand it , applying the `` longest match '' rule would r... | Are `` > > '' s in type parameters tokenized using a special rule ? |
Java : Am I breaking the “ Law of Demeter ” ? For example i create a Class person which contains name , phone and id and it match the column in my database.When I want to fill my Order info using person 's id.I do like this.I use getName and getPhone return by databaseComponent.That 's break LoD.Somebody recommend that... | Law of Demeter confusion in Java |
Java : I want to replace `` a '' of `` abababababababab '' with 001,002,003,004 ... ... that is `` 001b002b003b004b005b ... .. '' however this is poor efficiency , when the string is large enough , it will take minutes ! do you have a high efficiency way ? thanks very much ! <code> int n=1String test= '' ababababab '' ... | Java replace string with increasing number |
Java : Please take a look at below example i cant understand the relation between char and byteGive me compilation Error because c is type of char and b is type of byte so casting is must in such condition but now the tweest here is when i run below codeline 2 compile successfully it does n't need any casting at allso ... | char and byte with final access modifier - java |
Java : Considering the following toy example class : outerVar is volatile so all threads that may be using it will see it in the same state . But what about outerVar.innerVar ? Does the fact that its parent object ( outerVar ) is marked as volatile make it volatile also ? Or do we have to declare innerVar volatile expl... | Is Java 's volatile keyword `` recursive '' regarding references tree , or must each reference be declared as volatile ? |
Java : compilation error : The left-hand side of an assignment must be a variable but when I tried this way , there is no compilation errorgetBoolean ( ) is returning a boolean value , so for the first case why the for loop is not accepting boolean value directly ? <code> class A { public static void main ( String [ ] ... | why for loop is not accepting boolean value directly ? |
Java : Can you please run the below and explain ? I found that surprising as someone would expect 1 to be printed and not 1.0 <code> Object o = true ? new Integer ( 1 ) : new Double ( 2.0 ) ; System.out.println ( o ) ; | Strange java behaviour with conditional operator . Is it a bug ? |
Java : I am trying to test following method : Following is the Junit code : On the verify method call , I am getting following mockito exception : I do n't understand why mockito considers both the lambda 's are different ? UpdateI solved it without using Mockito . Here 's the other approach . Omitted empty overridden ... | Mockito how to verify lamba functions |
Java : While upgrading a build from Java 1.6 to 1.7 our unit tests started failing because of a difference between how the 2 versions handle the printing of trailing zeros on doubles.This can be reproduced with this example : Java 1.6 will output : Java 1.7 will output : I have 2 questions : Why is the printing of an i... | Difference in output printing a pre-initialized Java double vs. inline |
Java : I 'm trying to port some code from Linux to Windows . I really do n't know much about Windows , and so I 'm kind of flying blind . The code in question attempts to delete some directories using org.apache.commons.io.FileUtilssegments is a File , as is mergedSegFile . It dies with an IOException `` Unable to dele... | Why is this code dying on Windows ? |
Java : I want to write an APP to record screen , there are two way , RecordHelper_Method_A and RecordHelper_Method_B .In RecordHelper_Method_A , I define mMediaRecorder , MediaProjection mMediaProjection and mVirtualDisplay as static var , it 's easy to invoke , such as StartRecord ( mContext , requestCode , resultCode... | Which one is the better between using static var and passing object parameter ? |
Java : I was given this assignment yesterday in class and thought I understood the process of selection sort but I feel a little unsure about it now . I thought that after each pass the numbers on the left become sorted and are not checked again until all the numbers on the right have been sorted first.Below are the in... | Need help understanding Selection Sort Algorithm |
Java : I have this Java code some other person wrote , specifically JSPs . I am trying to understand where everything is.In my index.jsp ( the main file which is loaded ) it imports a certain namespace ( I suppose tomcat does all the compiling , I do n't know ) : This physical location does n't exist in my CLASSPATH so... | Java code - looking for source code |
Java : I have searched through stackoverflow as well as a few other sites and sadly have not found this question asked , let alone answered . Maybe my approach is best attempted another way ? I am new to Java ; this should be a really easy answer I would think.The issue : I have a static method that I would like to ret... | How can I use a non-static ( dynamic instance ) object as return for a static method in Java ? |
Java : I successfully read an XSD schema using org.eclipse.xsd.util.XSDResourceImpl and process all contained XSD elements , types , attributes etc.But when I want to process a reference to an element declared in the imported schema , I get null as its type . It seems the imported schemas are not processed by XSDResour... | Read XSD using org.eclipse.xsd.util.XSDResourceImpl |
Java : So I have a try/finally block . I need to execute a number of methods in the finally block . However , each one of those methods can throw an exception . Is there a way to ensure that all these methods are called ( or attempted ) without nested finally blocks ? This is what I do right now , which is pretty ugly ... | In java , is there a way to ensure that multiple methods get called in a finally block ? |
Java : I have a few classes that perform background tasks that might raise exceptions . They all implement the following interface : When one of the background tasks raises an exception , all the ExceptionHandlers are informed of the exception so that it can be properly handled / propagated.How would you call the inter... | What is this pattern ? |
Java : goal : I 'm using sharepoint REST APIs to create a list in my sharepoint site . In this case I 'm using okHttp as my Http library.expected result : should return 201 as response code when calling the request using okHttp.actual result : following are the steps I have implemented : create a bearer token set the r... | Bad request with response code 400 , when posting json data to rest api using okHttp 4 . * |
Java : I have an Android Service running daily which does some data synchronization . Once a day it downloads a file and caches it to disk via context.openFileOutput : This happens on a background thread.I also have a UI which contains a WebView . The WebView uses those cached resources if they are available via contex... | Synchronization between Context.openFileInput and Context.openFileOutput |
Java : For example , if I userather thandecompiled code will contain getOwner , getName , getSignature methods in Java code , due to reflection . Do these methods counted against 64k limit ? <code> methodReference = : :method methodReference = { method ( it ) } | Does Kotlin generated byte code affect the method count ? |
Java : I am trying to use Java Streams to collects all the Strings of the greatest length from my list : I would like my longest to contain { `` long word '' , `` long wwww '' , `` llll wwww '' } , because those are the Strings that have the greatest lengths . In case of only having one of the Strings with greatest len... | How can I collect only the elements of the greatest length with Java Streams ? |
Java : I think that ( String ) x is an unchecked cast , but the compiler does not give any warning . Why does it happen ? <code> public static void main ( String [ ] args ) { Object x=new Object ( ) ; String y= ( String ) x ; } | Why does n't the following codes cause `` unchecked cast '' warning ? |
Java : I have this class , it perfectly does what I want . Now I need new class VSV which will derive from ( vertical ) ScrollView and be just the same . I surely can just copy whole block and change extends HorizontalScrolView to extends ScrollView , and then ( L , 0 ) to ( 0 , L ) ( oops , this was a mistake when pub... | java sugaring , can I avoid almost-duplicate code here ? |
Java : I want to check whether JVM options for a particular application ( in this case , Matlab ) have been set to prefer IPV4 or if they still use IPV6.I know how to set the JVM to prefer IPV4 . In my case , it can be done by adding the line -Djava.net.preferIPv4Stack=trueto the java.opts file within $ MATLABROOT/bin/... | Check programatically ( without string-matching ) whether using IPV6 or IPV4 for JVM |
Java : In xml file i do next : In class Keyboard in the method onKeyDown i create next constructionbut is dont work . What 's wrong ? <code> < Row > < Key android : codes= '' FLAG_EDITOR_ACTION '' android : keyLabel= '' Start '' / > < /Row > @ Overridepublic boolean onKeyDown ( int keyCode , KeyEvent event ) { switch (... | How to create own key on soft Keyboard |
Java : I wonder how Hibernate finds NullValidator class which extends ConstraintValidator interface even if @ Null annotation definition as follows : <code> @ Target ( { METHOD , FIELD , ANNOTATION_TYPE , CONSTRUCTOR , PARAMETER } ) @ Retention ( RUNTIME ) @ Documented @ Constraint ( validatedBy = { } ) public @ interf... | How HibernateValidator finds ConstraintValidator when validatedBy is empty ? |
Java : I encountered below code in my project . I was wondering if it can be optimized further may be by using java 8 streams or by collection APIs in general.Note : unfilteredSet and adminAreaSet hold different child types of Student <code> private Set < Student > getFilteredSet ( ) { Set < Student > unfilteredSet = g... | Is there way of optimizing below code further using java8 ? |
Java : I want to have a constructor like the following.In this I would like to have a method called incrementValue ( Number n ) which will add n to value . I know you can not add two Number objects together due to the possible issues with casting . However , if I use a check to guarantee value and n are the same type i... | Java : add two values of the same type where both are subclasses of java.lang.Number |
Java : BackgroundAn existing system creates a plethora of HashMap instances via its Generics class : This is the single point of creation for all instances of classes that implement the Map interface . We would like the ability to change the map implementation without recompiling the application . This would allow us t... | Suppressing Warnings when using a dynamic class reference |
Java : So I have a class I have made which I wanted to be able to sort . To do so I simply had it implement the collection interface so it can be used in the Collections class . Now I have noticed that the class itself is just a hop , skip , and a jump away from a ListIterator and it would be nice to have it implement ... | Is it possible to implement both a ListIterator and a Collection in java ? |
Java : UPDATE solution is Java.lang.reflect.Proxy returning another proxy from invocation results in ClassCastException on assignmentMy test code proxies java.sql.Connection.I create my proxy like so : When I wrap an H2 DB connection , this works perfectly.When I try and wrap a MySQL connection , the cast of the proxy ... | can proxy some classes but not others |
Java : What is the equivalent c # generics notation of the above java generics ? Parameter listenerClass will be a type & not a object . But the object T has to belong to a specific hierachy . <code> public < T extends java.util.EventListener > T [ ] getListeners ( final Class < T > listenerClass ) { ... } | C # generics & not going insane |
Java : I 've created a minified JRE using the JLink toolI 've created a very basic application that connects to https : //www.example.comWhen I run this application using the JDK , everything works fine.When I run this using the minified JRE , I get the following : I 've noticed the lib\security\cacerts file in the JDK... | JRE created via JLink missing some security certificates ( cacerts ) |
Java : This code is benchmarking 3 different ways to compute the sum of the reciprocals of the elements of a double [ ] .a for-loopJava 8 streamsthe colt math libraryWhat is the reason that the computation using a simple for-loop is ~400 times faster than the one using streams ? ( Or is there anything needs to be impro... | Why is the sum of reciprocals using a for-loop ~400x faster than streams ? |
Java : I have the following code to check if a game unit is a player or an enemy . These are the only two categories . I could delete the isEnemy method and run all checks for enemy as if ( ! isPlayer ) , but I personally feel that if ( isEnemy ) makes the intent of the code clearer . Are there any established coding s... | Is redundant code acceptable if it improves readability ? |
Java : I 'm totally lost on why that wo n't work : Is this some weird Eclipse error message ( it 's not able to cope with Lamdas either , so maybe Mars is n't entirely Java 8 ready , yet ) ? I can fix it by letting SpecialTestImpl implement Test directly ( which yields a warning , because it 's unnecessary ) or overrid... | Using The Default Method Of Grandparent Interface |
Java : I have a Spring Boot application using javax.validation annotations and I 'm trying to return friendly JSON error messages pointing to the offending field , yet converting from the available `` Java-object '' path to either JSONPath or JSON Pointer is something I 'm not finding a way to do.SSCO sample : Output :... | From Spring BindingResult to field JSONPath/JSON Pointer , with Jackson |
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