Java
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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…… -
Java – this method contains redundancy checks for known non null values of the constant null
javac 1.7.0_79 javac 1.7.0_79 findbugs 3.0.0 Hello, I am using findbugs and I received this report with an error: This…… -
Java – try sliding windows
I try to print images like sliding windows I can't do it right Therefore, when the sliding window size is 1, it should…… -
Java – no suitable method for sort (int [], >) found
Algorithm problem: given a list of nonnegative integers, arrange them into the largest number For example, given [3,30…… -
Java – use Jackson to generate CSV without quotation marks
I'm using Jackson CSV to generate CSV files, but I want references everywhere I can't find any information on apidoc C…… -
Java – Android studio – change the default code style
I'm used to writing code in this way: private String blabla() { return "bla"; } However, Android studio has adjust…… -
Java heap memory usage fluctuates
Dear developer, I encountered heap memory usage problems in Java applications The application itself only accepts sock…… -
Get the first and last time (in milliseconds) using the Java 8 time API
I converted my time calculation from self implemented code to Java 8 time API I need from Java time. Year or Java time…… -
Java – hibernate / spring – rollback transaction in transaction
In view of this example code: public class MyServiceImpl implements MyService { @Transactional public void myT…… -
Java – the symbol ‘asynctask’ cannot be resolved in Android studio
I have a class that extends asynctask in Java, but Android studio will fail to resolve the symbol asynctask class GcmR…… -
Java – if you reopen the application, SharedPreferences is not saved
My sharing preferences will not be saved. If I reopen my game and the previously saved SharedPreferences data is not l…… -
How to achieve proper layer separation in xpage (that is, talking to Java objects instead of domino views and domino documents)
I am trying to implement appropriate layer separation in my xpage project Ideally, I try to reach the point where XML …… -
Java – how do I use null’s to sort a collection and then reverse the list?
So I'm using a list of dates, some of which are "" or null I used the answer how to handle nuts when using java collec……