Java
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java – Performance Encog vs Deeplearning4J
We are developing Java projects using neural networks We want to test different network structures on our data set Now…… -
Java 8: extracting sub streams from streams
I have an object stream from which I need to extract a stream with only some object properties For example, from strea…… -
Java – why can’t the final variable be used in a switch statement?
When I type the following code in eclipse, it complains that "case expressions must be constant expressions." If the a…… -
Java – place numbers on random points in a 2D array
I have a 2D array with 5 rows and 5 columns I want it to place a '1' character at 8 random points in the 2D array (mak…… -
Java 8 stream reduces arbitrary class types
Well, it's not a homework question, it's a question of "I got the Java 8 program and hope to finally pass the certific…… -
Java – unlimited when trying catch
I encountered a problem when I tried to execute a try catch statement in a loop I ask the user to input letters first …… -
Parallelism in rxjava – filters
I have some very simple code and read a bunch of strings & application filters I want the filter to run on multipl…… -
Java – the synchronization in the constructor makes it happen before
I have a question about how to ensure that objects are thread safe through the JAVA memory model I've read a lot that …… -
Java – how to insert millions of data into a database
I tried to insert a million records into the database table I want to create at least three threads, each thread trigg…… -
Java – HashMap can only be copied through hashcode()
See English answers > Why do I need to override the equals and hashcode methods in Java? 28 Therefore, whether K is…… -
Java – unable to parse the import org. Org springframework. test. context. junit4. SpringRunner
I'm trying to solve this problem from now on But I still haven't solved it I just got out of spring IO downloads a spr…… -
Java – read semicolon delimited CSV
I have the following code block, which uses opencsv to read CSV files and store column 7 The problem I face is that I …… -
Side effects in Java methods
This may be a trivial question, but I need to clarify public Example someMethod() { // ... different lines here …… -
Types – how to specify the element type in the vector of SbCl (or common LISP)?
I tried in SbCl 1.1 14, but it seems that type checking ignores the declaration of the vector element (defun test (vec…… -
Java – hibernate inheritance using different primary keys
I'm trying to use table_ PER_ Class policy creates inheritance, but I want to create a different primary key for each …… -
Java-8 – the java8 metaspacesize flag does not work
I have a simple test code that sets - XX: metaspacesize and - XX: maxmetaspacesize to the same value I don't think Met…… -
Java – kotlin: generic method and for loop request iterator ()
This is a simple generic method, and passing args in forgs to the for loop causes an error: fun main(args: Array<St…… -
Java – Operator ‘cannot be applied to’t’, which represents a bounded generic type
See English answers > generic type extending number, calculations 2 class MathOperationV1<T extends Number> {…… -
External configurable filtering using java lambda
Suppose I have an external JSON: [{ "condition": "equals","field": "name","value": "jack" },{ "condition": "…… -
Java – array initializers are not allowed here
I have some model classes. I try to declare a list with them, but I get that the array initializer is not allowed here…… -
Java-8 – pass the Java 8 stream mapping function as a parameter
I have a comma separated string that I want to convert to an array But in some cases, I need integer parsing, and some…… -
Java – @ datetimeformat not recognized
I tried to annotate a localdatetime object with @ datetimeformat My main idea is that once a string is received in the…… -
Java moves left and fills zeros
I want to move left, but fill in zero, just like int number = 20 >>> 10 = ( 0000 0000 0000 0000 0000 0000 000…… -
Java – regular expressions that begin with an underscore but do not contain any underscores
I try to get the name of the file from the last underscore until the end For example, ABC_ AA. XML should be ABC and A…… -
Java – cut and stack arrays
I have an int array as input The length of the array is always 2 ^ n. I want to cut the array in half and stack it Rep…… -
Compilation of generic class using generic interface failed
As far as I know, the following code should run without any compilation errors However, when I run this program, I get…… -
Java – Android spinner has a different background for each line
I know this topic has been solved many times. I have found several such problems, but I can't meet my needs I want a l…… -
Java – synchronization block within synchronization block
Can I include a synchronization block in another object to synchronize another object? Example: synchronized(myObjetc1…… -
Java – resteasy002142: multiple resource method matching requests
I'm following two completely different URLs, and I can't explain why: RESTEASY002142: Multiple resource methods m…… -
Java – how to interpret a simple setter as a consumer?
First, please wait patiently Most of the time I work in scala (sometimes only on the JVM side) or other languages, so …… -
Typescript – async / await clarity, with sleep example
I tried to get async / await suspended through the following implementation, but it didn't work as expected public sta…… -
Multithreaded (c) program threads cannot be terminated
I'm trying to complete a program that uses multiple threads (3) to distribute $4000 hypothetical scholarships Every ti……