包含标签：Java 的文章
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Convert a string into a decimal number with 2 decimal places in Java
In Java, I try to parse a string of formats "####. ##" into floating point numbers The string should always have 2 dec…… -
Java – LL1 Boolean operator grammar implements a recursive parser
This is a small piece from the original syntax, and I have to implement the correct parser for recursion We must remov…… -
Java – type set is not universal; It cannot be parameterized
My eclipse faces this strange problem Type set is not universal; It cannot be parameterized with the parameter < in…… -
JavaFX tableview does not display content
I'm trying to insert some values in tableview, but it doesn't display the text in the column, even if they are not emp…… -
Java – simulation server for spring OAuth endpoint
I'm trying integration testing to see how my registered endpoint behaves when it fails My registered endpoint is an AP…… -
Java – C: why objects are passed by value
In Java, all variables containing the appropriate object are actually references (i.e. pointers) Therefore, method cal…… -
Java – how do I evaluate this equation?
I think it's very self explanatory in the code Obviously, I don't evaluate the same thing over and over again, it's ju…… -
Java – errors occur when a simple spring startup project contains many third-party jars
Can I use the API from one of my own jars without including its dependencies? I created an independent Maven project (…… -
Java – no gradle dependency created in the gradle cache?
In my module In the dependencies of the gradle file, I have the following: dependencies { compile 'org.apache.cxf:…… -
Java – int error cannot dereference?
My constructor is wrong. I don't know how to fix it? I am a beginner of Java This is an example exercise I'm trying to…… -
Multithreading – clang thread safety annotations and sharing capabilities
When I use clang thread annotations, the following code generates a warning I'm trying to wrap boost:: shared_ Mutex a…… -
Java – how do I load all compiled classes from a folder?
I have a folder operator In this folder, I have compiled files (an interface operator and class 4 implementation opera…… -
Multithreading – is calling binaries such as LS or RM a bad Perl exercise?
I find Perl easy to do the following: print "File not found,valid files are:\n\n".`ls DIRECTORY | grep 'PHP'`; `rm…… -
How to solve the exception in thread “main” Java Lang.nullpointerexception error
See English answers > what is a NullPointerException, and how do I fix it? 12 java.lang.NullPointerException at two…… -
Java – why objectoutputstream Readobject() accesses MyClass readObject()
I'm reading the basics of Java io. I see that in order to use the custom writeobject function in a class, it must be d…… -
Which collection is used in Java?
I want to map integers to strings. They are one-to-one, for example: 60 : c 61 : c# 62 : d 63 : d# 64 : e 65 : f 66 : …… -
Java – what is the purpose of using reflection to modify strings?
I'm reading article, which says that Java strings are not completely immutable However, in the article's sample code f…… -
Java – the difference between a = B and a = a
In Java, I really want to know if there is a difference between using a = B; Or a = a, B Which one should I mainly use…… -
Java – why doesn’t Android clean up memory after completing the activity?
In my case, I have two activities called a (main activities) and B (children's activities) If I use Android memory mon…… -
Java – hosting private Maven artifacts in the GitHub repository
I use the following solution hosting a maven repository on GitHub to host a private Maven repository on GitHub I have …… -
Java – is JDBC secure?
I am a novice in JDBC. The new project requires me to use JDBC What I want to know is, Is JDBC secure? How to prevent …… -
Java – sqlnestedexception: unable to create poolableconnectionfactory (user ‘< >‘ @ ServerIP ‘denied access (use password: Yes))
I have an openshift site that tries to connect to an external MySQL server Here is my code so far public class BaseDAO…… -
Java – Grails overrides default email authentication
I found that Grails authentication also rejected some valid email addresses I opened a question on GitHub here Is ther…… -
Java – Method getbuild() does not define type mvcuricomponentsbuilder MethodArgumentBuilder
The problem of building URIs for controllers and methods from views @Controller @RequestMapping("/produtos") public cl…… -
How to use the & operator in Java? Porting C code
So I have this simple code in C if (flags & 4) Now, when I migrate rows to Java: if ((flags & 4) == 1) It will…… -
Java – should I use dependency injection for good design and testable code?
I have a class representing images: it's called photography The constructor is as follows: Photography::Photography(QS…… -
When a runtimeException is thrown, Java expects the return value
Why doesn't this compile (try Java 8 and Java 10)? It generates a missing return statement error public class Compiler…… -
Java – error compiling Maven selenium project – compilation error package not found
I tried to run the Maven project of selenium test (Maven - install) Below is POM <project xmlns="http://maven.apach…… -
Java – deploy / host spring boot applications
I recently completed a simple spring launch application using the IntelliJ ide The application runs locally as a sprin…… -
How to send objects to socket arrays in Java
Example: ArrayList arraySocket=new ArrayList(); ... arraySocket.add(client); ... for (Object arraySocket1 : arraySocke…… -
Java – get the latest application version from Google playstore when multiple apks are uploaded
I uploaded multiple apks for my app on playstore to support it on all devices The problem now is that when I use the f…… -
Java – relative file path with “user. Dir” system attribute
I'm trying to read a local file in a web application on the server When testing JBoss outside deployment, the file pat……