Recent Posts
-
How to create subclasses so that parameters belong to subclass types in Java
I have an abstract parent class animal: public abstract class Animal { public abstract <T extends Animal> T …… -
Java – Android architecture blueprint “todo MVP dagger”, where is @ provides for tasksrepository?
View the Android architecture blueprint "todo MVP dagger" here: https://github.com/googlesamples/android-architecture.…… -
Nanosecond time in Java, do not use Java util. Date
I need as little garbage collection (GC) as possible, very accurate and accurate time, ideally once a day System. Curr…… -
Java – two spring service beans with the same class name (different packages) will throw an error even if they use a qualifier
I have the following package package1; @Service @Qualifier("kb") public class UserService { ... } package package2; …… -
pthread_ cond_ Which thread will signal?
When a thread calls pthread_ cond_ Signal(), unix network programming says pthread_ cond_ Signal () is just that nofit…… -
ColdFusion Java method exception not found
This question makes me very angry I'm trying to use java to create document objects in ColdFusion When I do this: nd =…… -
Java – thread safety when inserting values into HashMap in a parallel stream
I need to make an asynchronous call with a timeout of 10 seconds, and I need to do this for each element in the map Th…… -
Java – when calling integer Should you check whether a string is empty before parseInt?
In a loop, thousands of items are converted from string to int, calling integer Should you check whether the string is…… -
Java datetimeformatterbuilder with optional mode causes datetimeparseexception
target Provide a flexible parser for localdate instances, which can process input in one of the following formats: >…… -
Java 8 groupby one field and then maps to multiple fields
I have an object structure like this class Person{ String userId; String firstName; String lastName; Set&l…… -
Collections – java8 converts lists to map >
I have a list < person > object and want to convert it to map < integer. The keyword of the list < person …… -
Why do two java files that differ only in comments produce different class files?
I have one named one Java file, which has only one comment line I compile it to generate the class file one Class and …… -
Java – is it possible to shallow copy singleton class objects?
Using the clone method, can we get many instances of a class that has become a singleton? In addition, is it necessary…… -
For loop to Java 8 stream foreach()
See English answers > break or return from Java 8 stream for each? 11 If any value does not exist, it immediately r…… -
Java reactor: how to generate flux from stdin?
I want to read user generated messages from stdin asynchronously Flux.from(stdinPublisher()) .subscribe(msg ->…… -
Java lambda expression: incompatible type: error return type in lambda expression
I have the following worklists, each of which is a list of profits and difficulties: List<List<Integer>> j…… -
Java bitwise “&” on integer
I have the following: int a = 10001000; int b = 10000000; I want the following output: (a&b) = 10000000; But my p…… -
Java – Jenkins: unable to run the program “docker”: error = 2, there is no such file or directory
I installed Jenkins on my local machine, which runs on MacOS High Sierra and installs docker I'm trying to run a simpl…… -
Trying to understand class inheritance in Java
Let me say I have a super class public class SuperSub { public void overideThisMethod(){ System.out.println("Pri…… -
Java modifies UTF-8 strings in Python
I connect to Java applications through python I need to be able to construct byte sequences that contain UTF - 8 strin…… -
How to dynamically determine the number of goroutines to process tasks
I wrote a virtual code to prove the purpose There are two channels and three goroutines in the code 1 goroutine genera…… -
Java – suppress jdk1 4 project warning
Can I create JDK 1.0 in eclipse 4 project prohibition warning? Edit: longer version One project requires jdk1 4 (no no…… -
How does Java make windows?
How does the JVM make its window? I know it has jar files and executable files Is it a graphics library standard insta…… -
Array – it is faster for PowerShell ArrayList Add or = operator?
I found that if you create an array in the power shell and do this: $myArray = @() $myArray += 7 Each time this statem…… -
Multithreading – pthreads – how to parallelize jobs
I need to parallelize a simple password cracking program to use it on N processor systems My idea is to create n threa…… -
Java – parameterized query: check whether the field is in the value array in the select statement
I'm trying to configure a parameterized query to have the following effects: SELECT field1 FROM myTable WHERE field2 I…… -
Speed of Java – Google App Engine spring MVC annotations
I am developing applications on gae using spring MVC and annotations It takes a long time for the application to load …… -
Java – remote debugging: no connection to wildly 14 on openjdk 11 on port 8787
I'm trying to connect my debugger to wild. Net running on open JDK 11 Although wildfly said: My IDE (IntelliJ idea CE …… -
I can use Java util. Set implements state transition for DFA in Java
I am working as close as possible to formally define the implementation of DFA as a learning exercise (and blog materi…… -
Java – Eclipse Plug-in – notification when opening the editor in eclipse
I want to be notified when I open the editor in eclipse What is the best way? Solution From this thread (Note: startin…… -
Why use Java. Net in Java security. Can securitymanager read any file?
I just want to read and write some files in my java program So I use Java security. Security manager to manage it, but…… -
Java – represents Association and inheritance in UML
If I have a class definition similar to the following: class A extends class B { private B b } How can I express this ……