Java
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Java – a rest service that accepts and returns objects How to write client?
I have announced two rest web services A simple return of an object Others accept one object and return another @XmlRo…… -
What is Java util. Random. O (n) of next (n)
I want to know Java util. Random. Is next (n) linearly proportional to N or a constant? Can someone help me with this …… -
Why should a Java – 12 factor application be self-contained?
In the 12 factor article on Port Binding Solution To understand the rules for port binding and self-contained applicat…… -
Java – can you confuse code with unit tests?
I wanted to confuse our Java Web application code in our existing ant build script, but I encountered a problem with u…… -
Java – passing ArrayList to a separate class?
I have a code to read from the SQL database and save each column of information to the ArrayList I need to pass each A…… -
Java – does creating a new thread have the side effect of refreshing the cache?
I wonder if creating a new thread in Java will trigger a cache refresh Suppose I do this in the following order: >T…… -
Java: enumerating values () and valueof (string)
Why does javac add the value () and valueof (string) methods to the enumeration type being defined? Wouldn't it be bet…… -
Java – export jasperreports in HTML format
The following code gets a byte [] result, which is applicable to PDF and xlsx An exception was thrown for HTML JasperP…… -
Pass Java map to C method using swig
I have a method defined in C: std::map<std::string,std::string> validate( std…… -
Trace the Java / Android stack to a unique bucket
When a stack trace of unhandled exceptions is recorded in Java or Android (for example, through acra), the stack trace…… -
Java – how to create a generic type safe HashMap by class type?
See English answers > java map with values limited by key's type parameter5 Later, I want to pass the class type an…… -
Java – should I override the hashcode () of the collection?
Given that I have a number of courses that cover a variety of areas: class MyClass { private String s; private…… -
A filled list with an empty vector causes its length to change
In the following code, I expect something of length 96, but I get a list of length 48 Can you explain the result? num_…… -
Java – log in and play non blocked?
Log in to play non blocked? Does it use some non blocking IO APIs behind the scenes? Is it scheduled in some other thr…… -
Randomize text files read in Java
I try to read a text file in Java, which is basically a set of problems There are four choices and one answer The stru…… -
java. Lang. internalerror: callersensitive comment expected in frame 1
In a static method (annotated with @ callersensitive), I try to get the name of the calling class: @CallerSensitive pu…… -
Java – jeooq does not generate Dao with flag set to true
I have refreshed my project, rebuilt it cleanly, searched for similar problems in stackoverflow with Google, read the …… -
Is there any way to use typescript in my code Collections. HashTable？
I saw the implementation of "hashtable" in the code of typescript compiler (in the file Src / compiler / core / hashta…… -
Do you need a reference to the second value to sort tuple vectors?
I have a vector of integer tuples and want to sort them by the second element of each tuple: fn main() { let mut t…… -
Java – how to use JPA2 to persist entities containing user type fields
I'm looking for a way to persist entities that contain user type fields import org.joda.time.DateTime; @Entity public…… -
Java – monitor windows directory size
I'm looking for something that can monitor the size of the windows directory and the number of files I'm talking about…… -
Java – ehcache – uses list as the cache value
So this is the problem I'm trying to solve - I have an object with two integer fields, and I want to cache public clas…… -
The Java logger uses the… Function
See English answer > which of array creation vs string concatenation for logging method has better performance? 3 m…… -
Java – can I prefix each row of the stack trace in log4j?
When you write logger.error("message",exception); Log4j generates a message and a complete stack trace: Aug 9 06:26:1…… -
Java – Guice abstractmodule installation method
What does the method install () in the abstractmodule class do? Can anyone explain to me? From the documents I read fr…… -
Java – softreferences and weakreferences / outofmemoryerror
There was a problem processing soft and weak references The code has a flag that can be switched The code is a little …… -
Java – what is the difference between static and non static annotations?
Java's internal classes can be static or non - static A non - static inner class is associated with an instance of a c…… -
Java – the font name “classname” is inserted into mongodb by morphia
I just started using mongodb and morphia. I realized that there was an extra part in the mongodb file. The record cont…… -
Java – length in array and length () in string
When we talk about arrays and length (), why is the length of data fields when we talk about strings in Java? Means: i…… -
Java – Office add in development – malformed get URL (_host_info =…)
I am currently developing MS Word office addin using the JavaScript interface provided by Microsoft I used Django back…… -
Java – hikaripool-1 – driverclassname requires JDBC URL
I'll go back and program my old program https://github.com/JonkiPro/REST-Web-Services. I have updated spring boot from…… -
Just in time compilation – when does it actually happen in Java?
Recently, I participated in a discussion on Java efficiency The answer is that Java code is often compiled directly in……