包含标签：Java 的文章
-
Java – is this abuse casting?
I have some object lists List<MyObject> But I know it is a list of objects inherited from MyObject List<Child…… -
Java – a common way to write duplicate arrays
For my programming task, I was asked to write a general copy method to copy from an array to an array of the same size…… -
A Java object is not an instance of a declared class
public class SendEmailImpl public class SendEmailImpl { private boolean isValidEmailAddress(String email) …… -
Java – how to receive user data from the console
My console Java application generates a 3 containing some random numbers × 3 matrix What I want to do is delete some r…… -
Java, multipart: determine whether the uploaded multipart is an image
I'm developing a spring MVC application. I have a file upload tool To this end, I want to determine whether the file u…… -
Ternary comparison if in Java
Why is it incorrect to use such triples, because it is correct to use if? //Error when using as ternary Character.isDi…… -
How do I display tabs with spaces?
I have a java program that draws each character (in its own frame) from a text file on a JPanel with a grid Code of dr…… -
If the file does not exist, what will readalllines return?
The Oracle document says here, files The readalllines (path, charset CS) method returns the lines in the file as list …… -
Java –: the selected pseudo class style does not apply to cells
I have some tableviews in the scene. I want to highlight the selected cells According to JavaFX CSS reference, there i…… -
Java – ` annotationconfignnonembeddedwebapplicationcontext ` has not been refreshed
When installing the springboot Legacy (web. XML) war application using the delegatingfilterproxy, I received the follo…… -
JavaFX – how to set the margins of borderpane in fxml?
I want to run this fxml code in JavaFX: <BorderPane fx:controller="com.bryantmorrill.chat.main.Controller" xm…… -
Java – spring switch implementation based on runtime conditions
This is the simplified version I want to implement For example, suppose I am an interface called color There are many …… -
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……