Java
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Can I write “foreach” functions in Java?
In PHP, you can do foreach ($array as $key = > $value) {/ / code. Can you create a function in Java to execute fore…… -
Java – IntelliJ code formatting, keeping / * package * / on the same line
In some cases, it makes sense to use package visibility for certain methods /* package */ int getSpan() { return…… -
How to use multiple threads to execute map, filter and flatmap in rxscala / Java?
How to use multiple threads to run filter, map and flatmap on observable: def withDelay[T](delay: Duration)(t: => T…… -
Java – Lucene search even if it should return no results
I am creating a Lucene search application. I use multiple instances of different analyzers and indexwriters of their i…… -
Differences between different implementations assigned to a wider range of types in Java
I know that assigning subclass implementations to variables of interface type is a best practice to maintain flexibili…… -
Java – layout parameter layout_ Weight is ignored unless layout is also specified on the tag_ Width and layout_ height
I treat this message as an error and cannot run the application <include android:layout_weight="1" layout=…… -
Java – can I use the same POM Redefine imported Maven dependencies in XML?
I'm working in an application server environment, and I'm using BOM to collect dependency information, as follows: <…… -
Java – check if string x is equal to any string in string []
If the string entered by the user is equal to any string in the string array, I try to set a Boolean value of true I i…… -
Java – object cache data structure with “object expiration”
Which data structure in Java is best suited for in memory object caching, where objects have a separate expiration tim…… -
What non free tools do java developers like
Most of the developers I interact with are using eclipse (I prefer NetBeans) and will take advantage of many free plug…… -
Java – upload running files in PHP
I know it sounds strange There is a PHP file on my server, which is responsible for processing the upload The Java pro…… -
Java – class level custom annotations cannot be detected in spring AOP
I tried to intercept classes in spring with the following settings Interceptor @Aspect @Component public class MyInter…… -
Java – how to run a thread repeatedly after a period of time
I want to run a thread (perform some time-consuming tasks in the background and do not update the UI). It just downloa…… -
Java – invalid name pattern when trying to pass custom Oracle type object mapping
Java spring customizes the Oracle type as a parameter and gets the following error I don't understand what the invalid…… -
Java: faster overloading or if / else
I have children's classes, and each class has other members who bring different types of value There may be longobject…… -
Java – one to many one-way parent-child ID cascade saving
When I try to save the ID from the parent class to the child class, I keep getting errors I tried all types of mapping…… -
Java – repeated input errors when using POI with gradle
I started a project that needed the Apache POI library I pasted them in my build Everything seems to be fine in the gr…… -
Java – use Jackson JSON parsing to convert true or false to Boolean values
I'm using the Jackson annotation to parse the JSON response into a POJO object I use Boolean variables in POJO to map …… -
java – Restlet Protocol. File usage
I have an example about protocol in the restlet site Problems with file usage // URI of the root directory. public sta…… -
Writing custom Java objects to parquet
I have some custom Java objects (internally composed of other custom objects) I want to write this to HDFS in parquet …… -
Cause: javax net. ssl. SSLHandshakeException：java. security. Cert.certificateexception: there is no x509trustmanager implementation (spring) in Java
I'm trying to verify that I have a server certificate. I've created a keystore and trust store The exception occurred …… -
Java – error R10 (boot timeout) – > the web process cannot bind to $port – heroku within 60 seconds after startup
I'm trying to deploy my server on heroku I received this error: Error R10 (Boot timeout) -> Web process Failed to b…… -
General Java questions about interfaces
Consider that I have a method that passes list as a parameter In this method, I want to use a specific function such a…… -
Playframework – cause: javax persistence. Entitynotfoundexception: bean deleted – deferred load failed
Edit: additional information: play.api.Application$$anon$1: Execution exception[[EntityNotFoundException: Bean has bee…… -
java – String. Error in replaceall() function
I'm trying the following code: – String x = "asdfg/dgws"; x.replaceAll("/","\\"); But it was a failure This gave me th…… -
Java – ternary operator does not work
NetBeans says my ternary operator is not a declaration How? int direction; direction = (Math.random() < 0.5) ? 0 : …… -
Java – InputStream closed by imageio
I encountered a very strange problem with imageio Some objects in my java program have an image I use the static metho…… -
About classes extended from base classes (Java)
I am a beginner of Java, trying to write a party task system for the game I am writing. I have a few questions I want …… -
Java – prime factorization of large numbers
I want to find the prime factorization of large numbers less than 10 ^ 12 public static List<Long> primeFactors(…… -
Why does the java compiler complain that local variables are not initialized here?
int a = 1,b; int a = 1,b; if(a > 0) b = 1; if(a <= 0) b = 2; System.out.println(b); If I run this, I receive: Ex…… -
Java – to in Oracle_ Display time zone description in char()
I have an SQL query select to_char(cast(sysdate as timestamp with LOCAL time zone),'YYYY-MM-DD,HH24:MI:SS TZR') from d…… -
Java – namespace issues
I have the following questions I tried to wrap the code from C to Java COMMON. H namespace rinad { namespace mad_manag……