Java
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Is java – volatile propagated to instance members?
Suppose you have some simple container declarations and instantiate them like this class Test { private volatile L…… -
JavaFX filteredlist, which filters based on the properties of the items in the list
I have a case where I need to filter an observablelist < item > based on some attributes of the item (that is, t…… -
Java – I need to insert randomly generated numbers into the array
I examined these questions carefully with similar words or intentions, but it seems that I can't find any questions th…… -
java. Lang. IllegalStateException: commit has been called
I tried the following code, try { final Activity activity = ctx; FragmentTransaction ft = activity.getFragment…… -
Java – mybatis uses XML configuration in spring to return large results
I need to dump data from tables in Oracle to elastic search (100 million records), package com.fudy.mapper; import jav…… -
Java – null pointer exception error, no obvious code error
I have a mistake here. I don't know where it comes from My java course for beginners is high school, so I don't have m…… -
java – Thread. Yield () is still a cross platform minefield?
I can find the answers of old references and so, say thread The behavior of yield() varies from platform to platform T…… -
How do I add new functionality to pre-existing Java components?
To explain what I mean, I'll use the following code example Imagine you have this function private void fadeButton(JBu…… -
Java streams – how to use conditions on keys to translate all values in a collection map
I have a map Let's talk Map<Long,List<MyObj>> I want to create a long array in all myobjs, where the key (…… -
. Net – how to make an asynchronous servicecontroller WaitForStatus？
So servicecontroller Waitforstatus is a blocked call How can I complete the task / asynchronously? Solution ServiceCon…… -
Java – spring MVC and Hibernate cannot obtain the session of transaction synchronization for the current thread
I have a spring application that works with hibernate Hibernate session is not created Throw an error as shown below &…… -
Java – why is map conversion so narrow?
I know the difference between narrow transform and wide transform of RDD My question is which parameters can prove tha…… -
Java 8: are longadder and longaccumulator the first choice for atomiclong?
Longadder as a substitute for atomiclong ExecutorService executor = Executors.newFixedThreadPool(2); IntStream.ran…… -
Java – case insensitive string What is an alternative to the contains method?
See English answers > how to check if a string contains another string in a case insensitive manner in Java? 17 If …… -
How to get each number separately by numbers (floating point numbers) and using int Java
Is there a good way to search the first four numbers of a floating-point number and return each number separately with…… -
Java equivalent Delphi language features
See English answer > equivalent of c# anonymous methods in Java? 6 I see from the Java language specification that …… -
Java / spring application cannot start on cloudfoundry: outofmemoryerror compresses class space
After deploying the new version of Java / spring boot software to the Swisscom developer cloud running on the cloud fo…… -
JavaFX: how to create a scrollpane pan only on the middle key?
When panning is allowed, the scrollpane pane of JavaFX displays all mouse events: scrollPane.setPannable(true); How ca…… -
Java – Tomcat permission denied when trying to write to a file
I'd like to send a zip through the Tomcat server But when I try to visit http://localhost:8094/fetna -At project rest …… -
Java – unlimited when trying catch
I encountered a problem when I tried to execute a try catch statement in a loop I ask the user to input letters first …… -
Is it possible to resolve ambiguity through annotations in Java
See English answers > method overloading for null argument 7 void bla(Integer a); void bla(String a); Basically, wh…… -
Java – unit testing: calling @PostConstruct after defining simulation behavior
I have two classes: public MyService { @Autowired private MyDao myDao; private List<Items>…… -
Java – add a property file on the classpath
I am building a spring independent application based on spring boot I want this application to read its properties fro…… -
Java – a bufferedimage is grayed out
I tried to gray the buffered image (instead of converting it to gray, just add gray at the top) Now I do this by using…… -
java. Lang. illegalargumentexception: undefined filter parameter [P1]
I'm trying to execute hibernate filter This is my POJO course: @Entity @Table(name="flight") @FilterDef(name="f1",para…… -
Java – why do I use random run to get the same number?
I'm following a book and in this Code: Random rand = new Random(47); int i,j,k; j = rand.nextInt(100) + 1; …… -
Java – build error: Jack needs build tool 24.0 0 or later
I use the RX Library in my android project, and for some reason, I need to build Gradle as: apply plugin: 'com.android…… -
Java – dagger 2: error getting multiple instances of the same object using @ named
How can I get multiple instances of the same return type like a cursor For example:- Module @CursorScope public class …… -
Java – Android NFC device owner configuration: send custom attributes Is it possible?
I am developing an application and have the following problems When using NFC for device owner configuration, I want t…… -
Java – textview confirmation location
I'm trying to make an Android code that provides different work for each button So when the user presses button 1, the…… -
java – CompletableFuture vs Spring Transactions
idea I have a handler that receives a list of items and processes them asynchronously using an external web service Th…… -
Java transform format String
I'm still a novice in Java. I wonder if there is any way to format double without rounding? double n = 0.12876543; Str……