Java
-
Java – cannot be in class org apache. log4j. core. layout. Calling factory methods for element jsonlayout in jsonlayout
I tried to log in to JSON format through log4j2 This is my log4j2 XML file: <?xml version="1.0" encoding="UTF-8"?&g…… -
Classic singleton and lazy using java 8 performance
Recently, I read an article "be lazy with Java 8", which introduces a method to create inert objects (objects whose in…… -
Java – JNI with C keeps crashing cout, printf and method calls
I am writing my first JNI program in C and have developed test methods to ensure that everything is normal The problem…… -
Java – Android: snackBar gives ArrayIndexOutOfBoundsException
It seems that the code of exception is as follows: Snackbar.make(findViewById(R.id.content_main),"E' necessario abilit…… -
Java – delete random index from ArrayList
I have a 4-item ArrayList I need to randomly delete an item and display the updated ArrayList However, my random numbe…… -
Java – Android view animation lifecycle
I would like to ask if the animation will be cancelled if the view is destroyed when the configuration changes I have …… -
Java – IntelliJ – coding style issues
Sorry for the wide range of questions, but how do I set IntelliJ to wrap long method calls as follows: The style of al…… -
How to format multiline tostring() using printf in Java
Therefore, for my beginner programming class, we must write a program focusing on inheritance. We can create and input…… -
Java – parsing soap services using retrofit I’m facing an exception (i.e. a mismatched body model in the class envelope model in the response)
This exception is encountered when parsing the response in soap services using retrofit Iam My exceptions are as follo…… -
Javax. In JDK 7u79 smartcardio. Card. Disconnect (Boolean reset) behavior?
According to the release notes of JRE 7u72: When calling javax smartcardio. Card. When disconnect (true), even if I ha…… -
Java – spring MVC form errors have not been processed on JSP
I'm trying to validate the login form After clicking the login button, the control enters my controller class. With th…… -
Java – dead code warning in try with resources, but not in try catch finally in translation
The following code uses the try - with - resources structure introduced in Java 8 Occasionally, the throw () method is…… -
Java – the calculator does not handle two operator equations
I am developing a calculator application and all functions have been turned off The only problem is that when I enter …… -
How to find an unknown duplicate substring in a string or table Coulmn
I have a large string of numbers as input to the program (I think the sequence name is's'). It can be a string or a ta…… -
How to convert telegraph API core date: int type to Java date?
See English answers > converting long to date in Java returns 1970 11 There is date: int, a ten digit integer with …… -
Java – spring security login 2fa – first check the user name and password, and then request 2fa code when needed
I have set 2fa spring safety The problem is that the 2fa code must now be entered in the same form as the user name / …… -
Basic Java algorithm assistance
I need help writing a program that gives a specified number of coordinate points in the form of (x, y) The score to be…… -
How to use arraymap in the code of JUnit (non institutional) Android unit test?
If an unchecked unit test (not subclassed from androidtestcase) calls code using arraymap, it will be in XX xx. The no…… -
Java – a separate execution queue for a single executor to track the remaining data
In my jetty service, I have an endpoint that triggers a large number of threads I am currently using threadexecutiorpo…… -
Java – how to implement video using connectionservice
I want to use the system application to realize video chat through connection service https://developer.android.com/re…… -
When using async driver for Java, not all documents are inserted into mongodb
I'm trying to use the mongodb async driver（ http://mongodb.github.io/mongo-java-driver/3.0/driver-async/ ）And notice…… -
Java – why does it always call the parent method “dotest (double D)”?
See English answers > polymer in overloaded and overridden methods 4 class PolymorphisomTest { class Base { …… -
Using robot JavaFX keyevents is delayed when movemouse()
I'm trying to write some kind of first person view 3D game in JavaFX, and the motion effect is good so far I'm using J…… -
Can fields of a Java class be of multiple types without using generics?
I have a class whose instances will be serialized Therefore, this class implements serializable This class has a field…… -
Java – how to merge two Android studio projects into one [copy]
See English answers > how to create jar for Android Library Project 8 Solution From combine Android projects togeth…… -
Javac for dynamic compilation does not work
I'm trying to compile a HelloWorld class as a test, which shows an error I don't know how to solve It seems that it is…… -
Java – how to conduct transactions in the service layer
There is a Dao layer in my project This is my usersdao interface, which implements usersdaoimpl public interface Users…… -
Java – without a print statement, the loop cannot see the value changed by other threads
In my code, I have a loop waiting to change a state from a different thread Another thread works, but my loop will nev…… -
Java – “unable to parse: com. Google. Firebase: firebase core: 9.0.0”
I want to use fire base for authentication in my Android application >I created the application, then downloaded th…… -
Java – soap service using NTLM authentication
I tried to create an NTLM engine by following http://hc.apache.org/httpcomponents-client-4.3.x/ntlm.html I use NTLM au…… -
Java – spring cloud AWS code did not find S3 file
I don't understand why the spring AWS cloud code didn't find my S3 file My spring bean XML configuration has' AWS cont…… -
Java – Active Directory password reset without SSL
I tried to reset the password of an active directory user without SSL Through this link, we can learn that the impulse……