Java
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Exponential backoff in rxjava
I have an API that accepts an observable that triggers an event I want to return an observable. If an Internet connect…… -
Java object < = relational operator check
In Java, when = = is used to compare two objects, their references are also compared But what happens when other relat…… -
Java – link list class and default linked list class from scratch?
As a project / assignment student, I have been writing my linked list data structure. I want to know whether "real wor…… -
How efficient is java serialization?
We have a class named row, which represents a row in the result set We need to write a list < < row > submiss…… -
Java – how to add cookies to the htmlunit request header?
I'm trying to visit a website, but I can't add the collected "cookies" to the outgoing post request header I have been…… -
Java – repeat once integer n times
I tried to make a pyramid out of integers 3 33 333 So based on the answer I found, I did this: int n = 8; String n2 = …… -
Java – forces abstract methods to execute predefined code – similar to overloaded return statements
I have an abstract class of abstract methods public abstract class Foo{ public int bar(); } This is inherited and …… -
Is this the correct implementation of the bridge pattern in Java?
I'm trying to improve my understanding of design patterns, and I'm a little confused about bridge patterns You can see…… -
Java – SQS expiredtoken: the security token contained in the request is expired status code: 403
I have a long - running worker process running on EC2 that uses items from the SQS queue After some time (8-12 hours, …… -
Java – how do you ensure that spring @ EventListener is called first?
When implementing the applicationlister interface, there is an option to implement ordered to specify the call order S…… -
Java – undefined behavior
I did some simulations on C and I encountered a strange problem I have the following function to return the vector of …… -
Embedded wharf java. lang.IllegalStateException：！ STOPPED
I tried to make a simple servlet in an embedded jetty container public class Application { public static void main(S…… -
Java – obtain the currently logged in user from the spring angle
I use spring security in the spring boot application. I want to get the currently logged in user from the principal #g…… -
Unable to run program “…” error = 2, no such file or directory (Java)
I'm trying to create a java program that will set up an SSH connection for me on my MacBook It prompts me for a user n…… -
Comparing “queue” objects in Java
I am currently studying the properties of the queue interface and encounter the following declaration in Java document…… -
Java – gradle build error (Android studio 2.2.2)
I installed Android studio 2.2 with the necessary packages on Debian Jessie 2 and check for updates When the gradle bu…… -
How does Java 8 pass non functional methods as parameters
See English answers > java pass method as parameter 15 Class SimpleClass { methodA(var1,var2) { //body …… -
Database – Java multiple database connections in UserTransaction
static void clean() throws Exception { static void clean() throws Exception { final UserTransaction tx = InitialCont…… -
Error creating bean named ‘application’, unable to find default constructor; The nested exception is Java lang.NoSuchMethodException
I don't quite understand why this code gives me the error "can't find the default constructor" The constructor is @ Au…… -
How to replace two loops with a stream and keep the same elements in the list
Set <ShipperModel> shippers = baseSiteSerivce.getCurrentBaseSite().getStores().get(0).getShippers(); Set…… -
External parameters referenced by methods in Java 8
I want to pass external parameters to method references: String prefix = "The number is :"; numbers.forEach(Main::prin…… -
Add a table with borders for each cell in Javadoc
I know I can use HTML tags in Java documents How do I add a table with borders for each cell? I want the cells to alig…… -
How to convert a list into a map in Java 8 Map function in chain
See the English answer > java 8 grouping using custom collector? 3 class Passenger { String type; String firs…… -
Java – localdate cannot resolve ‘WW’ using ‘yyyy’
I must parse the date in the following format: "201710", in which the year number of 10 weeks I try to achieve it in t…… -
RX Java – create an observable by combining other observables, and issue events from the first sampling
When one is an infinite data source, I need to combine two observers, and the other is an indicator that obtains the l…… -
JavaFX: when tabed to the textarea, place the insert / cursor at the end of the textarea
(searching on stack overflow, I see that this problem is aimed at JavaScript rather than JavaFX) I have a textarea tha…… -
Java – * and * * differences
*What's the difference between and * *? Why** When using pattern Did not compile when compiling (". * *");? Solution S…… -
Java – Android: reverse the position of recyclerview
I'm setting up a recyclerview like a list. I want to have a button at the bottom of the list to add more views when cl…… -
Convert from swing to JavaFX?
When converting a swing project to a JavaFX project, which classes in JavaFX match the swing class? 1 - 1 is the best …… -
The Java size() function does not work in Processing 3.0
I tried to set the window size by passing parameters from image width and height in Processing 3.0 However, processing…… -
How to draw arrow JavaFX? (pane)
I need to make a directed graph from undirected I can draw line edge, but I don't know how to make arrows: public clas…… -
Java – what is notifyitemrangechanged (0, this. Data. Size()); How does it work in this example?
I understand how the onbindviewholder of viewholder works, but I don't know how notifyitemrangechanged (0, this. Data.……