Java
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Java – how do I resolve an IP address or host name that contains alpha characters?
I tried to separate two different types of strings, IP address and DNS address I can't figure out how to split it My i…… -
How does this filter apply in Java 8?
First of all, I apologize for the title of the problem. I can't think of a better way to express it. If I should solve…… -
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…… -
Java – overriding protected methods of superclasses
In the following example, why does string B print null and string c print "GG" If I am wrong, please correct me whenev…… -
Clojure: adding indexes to map vectors
I have a vector map I want to associate an index element with each element Example: (append-index [{:name "foo"} {:nam…… -
Aurelia navigation bar virtual machine does not work
I set up nav bar according to the example in the Aurelia tutorial HTML and nav bar js. Later, I wanted to work at nav …… -
Java – handle leap seconds correctly
Before and during leap seconds, it seems that calling new date() will return 23:59:59 twice (once before leap seconds …… -
Java – how do I detect the number of fingers in use?
I'm playing a game with libgdx. I need to know if the user is using two fingers and placing them in the right position…… -
Java – under what conditions can two different objects have the same hashcode () value?
All I know is: – "Int hashcode() returns the memory address of the object and the default hash value of the object“ If…… -
Java – whether UI threads can be blocked when the alert dialog box is displayed
I have this method. Basically, I wait for the items in the singleton queue to become empty. A background service is ru…… -
How to set the JavaFX WebView to be as large as the scene?
I have a JavaFX WebView, and I want it to be as big as the scene at the beginning If I could resize the scene, it woul…… -
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…… -
How to split character vectors based on the length of the list
I have this character vector: a<-c("tanaman","cabai","banget","hama","sakit","tanaman","koramil","nogosari","melaks…… -
Java thread stop Notifier
My task is to use multiple threads to perform decompression I did it with the following structure // A class for Unzip…… -
Java – why convert up a class that doesn’t change the rewriting method?
See English answers > overriding member variables in Java 10 class BritishPerson { public String name = "A brit…… -
Java – spring MVC @ requestbody map optional
I have a rest controller for this method: @RequestMapping(value = "",method = { RequestMethod.POST },produces = { Medi…… -
Java – what’s the point of a clonable interface?
What's the point of a clonable interface in Java? The core object in Java has a clone () method Can you override that …… -
Does Java automatically optimize loops for multi-core processors
A developer told me today that Java (or JIT) can automatically optimize the execution of the for loop, so that it can …… -
Java – a method that does not return a value when “return” is encountered in “if”
My problem is that this method "islargest" encounters "return true;" Time does not end Even if the condition in "else …… -
Let the presentation layer (JSF) handle business exceptions from the service layer (EJB)
Update the EJB method of the provided entity (using CMT): @Override @SuppressWarnings("unchecked") public boolean upda…… -
Can Java string literals be garbage collected? If so, how to prove it?
Can Java string literals like "ABC" be garbage collected? If so, how can we programmatically prove that they are GCed?…… -
Java – get localdatetime from seconds, including time zone
I have time from our computer "day 0" (at midnight on January 1, 1970) in a few seconds. I want to convert it to a loc…… -
Java – eclipse debugger does not stop at a conditional breakpoint
I have this java code in eclipse and I want to debug it This is the code: public Double repulsion(Node n1,Node n2) { …… -
In Java Correct method of setting read-only path in NiO 2
I'm confused... According to this Java page file The setreadonly() function is now a "legacy" function and should be c…… -
java. nio. file. Nosuchfileexception: why NiO did not create a file
I'm using Java nio. File package and try to create a file using the following code private static void printReport(Str…… -
Java – there is no OpenGL context in the current thread
I'm following the tutorial on youtube, but I've encountered an OpenGL problem that I can't solve I don't know how to s…… -
Java – the file was not found when trying to compile the telegraph source code
I'm trying to build an application like telegraph I downloaded their source code（ https://github.com/DrKLO/Telegram …… -
Java InputStream closed in thread
I tried to read from the InputStream in the thread The class that thread should run looks like this static private cla……