Recent Posts
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Java – use add () in the fragmenttransaction addToBackStack(),add(). Detach() and replace() What’s the difference between addtobackstack()?
In the FragmentTransaction project on Android docs, the method replace () is described, which is the same as calling t…… -
Java – default timeout for httpcomponent client
I can't find any documents on the default httpparams of httpclient 4.1? What is the default socket timeout when I do a…… -
Java – JPS cannot connect to remote jstatd
I'm using jstatd to query a remote JVM using JPS so that I can eventually monitor it using visual VM I use jstatd to r…… -
Java – lists and lists
Why lose type security when using list and use list < Object >? Aren't they basically the same? Editor: I found …… -
@Elementcollection Java persistence (hibernate) causes duplicate instances to be loaded
When @ elementcollection is used, multiple instances of all objects being loaded are loaded More specifically, it is l…… -
Java: the difference between collections and “data structures”
In Java, I don't understand the relationship between sets and "data structures" In my opinion, set refers to list, set…… -
Is the Java – VIM editor smart?
I program in C or Java So I want to use the VIM editor because it is very flexible I heard I can configure the VIM edi…… -
Java – convert a triangle to another triangle
Hi, I'm trying to create an affine transformation, let me turn one triangle into another I have the coordinates of two…… -
Sparksql and explode on dataframe in Java
Is there a simple way to use array column explosion on sparksql dataframe? It's relatively simple in Scala, but this f…… -
Java – delete elements from copyonwritearraylist
I received an exception when I tried to delete an element from copyonwritearraylist using an iterator (from http://dow…… -
How to extract dates from UUIDs using Java?
How to convert UUID to date format 2011-04-22? For example, I have such a UUID 118ffe80-466b-11e1-b5a5-5732cf729524. H…… -
Java: the difference between collections and “data structures”
In Java, I don't understand the relationship between sets and "data structures" In my opinion, set refers to list, set…… -
Java – sqlitedatabase multi thread locking mode
I use this class to manage connections to the underlying SQLite database public class BasicDataSource { protected…… -
Sparksql and explode on dataframe in Java
Is there a simple way to use array column explosion on sparksql dataframe? It's relatively simple in Scala, but this f…… -
The best way to merge and remove duplicates from multiple lists in Java
I have a situation where I will receive 2 ArrayList < widget > I need to be able to merge all lists and delete a…… -
java – Make Enum. Tostring() localization
I'm developing an Android application and I want to know if I can set enum Tostring() multilingual I'll use this enume…… -
JavaFX – how to make ComboBox hgrow?
I have JavaFX (8), H@R_509_2419 @, Combo@R_509_2419 @And hgrow This is my fxml Code: <?xml version="1.0" encoding="…… -
Java – why is maptoint() not in the optionalint class?
The intstream class has map(), maptoobj(), maptolong() and maptodouble() methods, but these methods seem to be missing…… -
Java introspection – strange behavior
The following code is a small example that can easily reproduce the problem So I have a variable of type string and se…… -
Java – spring data dynamic query
I am using spring data to set up a dynamic query. Basically, I have an array with a series of features. I need to comb…… -
Java – JPA: @ primarykeyjoincolumn (…) and @ joincolumn (…, insertable =?, updatable =?) Same?
It can be derived from the JPA specification if there is no @ primarykeyjoincolumn (...) with pluggable and updatable …… -
Java – what is the meaning of the three points in the function parameters?
There is already an answer to this question: > java, 3 dots in parameters8 private class DownloadFilesTask extends …… -
Java – does JSF use JSP?
I'm learning JSF and I have some questions I know JSF is a UI framework for making pages. I'm using it and successfull…… -
Java – automatically redirect from one JSP page to another
Once the home page is loaded, can users be automatically redirected to the second JSP page@ H_ 502_ 2@ resolvent Solut…… -
How do I register JavaScript callbacks in a java applet?
I'm developing an invisible Java applet that will be completely controlled by JavaScript I can easily call the Java me…… -
Java – JPA POJO as data object
What are the best practices for using JPA entities? Since the JPA entity is only a POJO, is it appropriate to use this…… -
How does Java’s dynamic proxy actually work?
I know how to use dynamic proxies in Java, but what I don't understand is how VM actually creates dynamic proxies Does…… -
Java – get the metadata of the file
Can I know the metadata of a file through Java? If so, how to get the metadata of the file in Java? Solution You can g…… -
Remote virtual machine using vagrant
I want to use vagrant to make the virtual machine run on a more powerful server than my laptop Can I use vagrant remot…… -
java – com. w3c. dom. Document does not have
I'm using the following code to create com. Com from string w3c. dom. Document： DocumentBuilderFactory docFactory = D…… -
Parallelism and plan view in Java 8 streams
Hey, I have a problem with parallelism when I use flatmap IntStream.of(-1,1).parallel().flatMap(i->IntStream.range(…… -
Java – should you report the message text of the exception?
Consider some code that can throw a check exception (an exception of type exception) Of course, your code catches exce……