Java
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Java – Apache beam – integration test of unbounded pcollection
We are building integration tests for the Apache beam pipeline and have encountered some problems For background infor…… -
Java – Android Google Maps V2 – SD card as tile provider
I am using Google Maps API V2 to develop an Android application. I have to use offline tiles. I have all tiles of the …… -
Add two vectors by name
I have two named vectors v1 <- 1:4 v2 <- 3:5 names(v1) <- c("a","b","c","d") names(v2) <- c("c","e","d") I…… -
Java – checks at run time whether a class has a specific constructor that uses generics
Hello:) I'm trying to choose the correct constructor in the class This is the code: Constructor[] constructors = targe…… -
Java – JPA – delete children from the onetomany relationship
In the @ onetomany relationship, if I want to delete a child, do I need to explicitly delete the child from the parent…… -
Java – spring boot devtools gets ClassCastException from the cache
I'm having trouble getting value from the cache java.lang.RuntimeException: java.lang.ClassCastException: com.mycom.ad…… -
Suggestions for finding end-to-end Java CPU profilers [closed]
What good end-to-end CPU analyzers exist in Java? Quick list I'm looking for: >Offline analysis – no user interacti…… -
Java – signal / slot mechanism
For people with relatively new Java ecosystems, is there a fairly lightweight way to perform the processing of their s…… -
Java – how to read line by line using FileReader
Thank you for your attention I created a program and I am using the login form and registration form Once users regist…… -
java – EJB3 / JPA @Transactional
Is there an EJB or JPA annotation equivalent to spring's @ transactional? Solution The equivalent EJB 3 attribute is j…… -
Java – how to make jtidy format HTML documents well?
I'm using jtidy v.r938 I'm using this code to try to clean up the page final Tidy tidy = new Tidy(); tidy.setQuiet(fal…… -
Is there a data structure / library in the memory OLAP / pivot table in Java / Scala?
Related issues This question is very relevant, but 2 years old: in memory OLAP engine in Java background I want to cre…… -
Jpa-2.0 – JPA cascading persistence – many to one
I have a one - on - one relationship and I'm trying to stick to a sub - entity public class Office { public int id; pu…… -
Java unchecked / exception clarification
I've been reading about unchecked and checked questions, and no online resource really knows these differences and whe…… -
Java – overrides tostring() using overridden tostring()
Basically, that's what I want to achieve classname @ address(？) [original tostring()], the name of the object and the…… -
Java – where can I find the base64encoder class?
Hi, I saw an example with this code on stackoverflow: String encoding = Base64Encoder.encode ("test1:test1"); HttpPost…… -
Java 8 – zoneddatetime is not equal to another zoneddatetime
I created two zoneddatetime objects, which I think should be the same: public static void main(String[] args) { Zo…… -
Java – how to configure spring boot applications to continue using resteasy?
I have an old web application (pure servlet without spring) and I want to run it as fat jar Solution You can use reste…… -
Is there a standard option or nullable class in Java?
Nullable (c#) has some different meanings, but in any case, option (Scala) and nullable can be used to express the con…… -
Java – understand the last value and value returned by try catch
I have the following code public static void main(String[] args) { System.out.println(returnString()); } private s…… -
What is monad emulation in Java?
I know that in scala and many other functional languages, monad is mainly an interface implementation (for example, us…… -
Java – strange gradle IntelliJ error
When I tried to import the gradle project in IntelliJ idea, the following error occurred: The beginning of the IDE log…… -
Key of string in Java RSA
I use RSA encryption in my application To store the generated public key, I convert it to a string and save it in the …… -
Java – how to execute unit tests using threads?
Executive Summary: when an assertion error is thrown in the thread, the unit test will not crash This makes sense beca…… -
Java – why the super class method?
class One { class One { public void doThing(One o) {System.out.println("One");} } class Two extends One{ public…… -
java – httpURLConnection vs apache commons http
I just want to know if you have any problems using the Java default httpurlconnection class A bug that lets you switch…… -
And Java util. stream. Stream processes two lists in parallel
For each element in each list, perform an action Elements can be processed in any order For example, in old Java: List…… -
Java – querydsl – case expression with string value
QueryDsl 3.3. four public class Document { private Confirmation confirmation; } public class Confirmation { .…… -
User interface – which is a better tool for BlackBerry application development?
Which GUI development option provides an optimized and faster GUI for BlackBerry applications? Solution There is no do…… -
How to find the time complexity of recursive methods in Java?
I can't fully grasp the concept of complexity. I want to know how to calculate it for method f (n) in this Code: impor…… -
Java – is there anything better than calling arrays Aslist is a better alternative to list initialization?
Is there a better alternative to using arrays Aslist as a list batch initialization program? Worryingly, this one is v…… -
Java – how to deeply copy 2-dimensional arrays (different row sizes)
This is my first question in such a community, so my format may not be very good. Sorry Since my problem is that I wan……