Java
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Java – how to read line by line using FileReader
Thank you for your attention I created a program and I am using the login form and registration form Once users regist…… -
Is there a standard option or nullable class in Java?
Nullable (c#) has some different meanings, but in any case, option (Scala) and nullable can be used to express the con…… -
How to use java to control the LED lights connected to PC through USB / SerialPort, etc? What equipment should I use?
I want to write a program in Java, which can control the LED light to connect to the "thing" connected to the computer…… -
Java – add multiple jpprogressbars to the tablecolumn of JTable
I have added multiple jpprogressbars to the tablecolumn of JTable After some calculations, I'm updating all jpprogress…… -
How do I synchronize from two processes – atomic writes on one file?
I have two processes. Each process writes big data buffer. I want to control the synchronization of these processes to…… -
Java – is there any way to use secondarytable to jump multiple tables?
Suppose I have a main user table named userprofile and a display name I have various modules. You can use userprofile …… -
Java – identify swing components on specific screen coordinates? (and manually schedule mouseevents)
I'm working on some Java applications that are compatible with alternative input devices Unfortunately, the device in …… -
Java – primitive types and in generics Differences between
It may be asked somewhere, but I can't find it Please tell me the exact difference between the two: ArrayList list = n…… -
Programming languages – why are closures suddenly useful for optimizing programs to run on multiple cores?
I read an article claiming that closure (or "block") is a useful weapon in "multi-nuclear war", because Now, I'm not t…… -
JAVA_ Home is not defined correctly (only from Jenkins)
Tried to set Jenkins, but my build failed: $ant test Error: JAVA_HOME is not defined correctly. We cannot execute /u…… -
Java – beannotofrequiredtypeexception, but it is actually a $proxy type
I need help with spring and proxy issues Webapp project – > Spring context <context:annotation-config/> <c…… -
java – Calendar. What does undecimber do?
The calendar class has a constant named undefcimber It describes the 13th month Is this constant useful? In Wikipedia,…… -
What time do you use the Callable object to call call () in Java Executor?
Here are some sample code for example What I need to know is when calling call () on calllable? What triggered it? pub…… -
How to create a linked list array in Java?
So I need to input the edges of a bipartite graph like this: 6 1 3 1 2 1 5 2 7 2 4 2 9 The first number is the number …… -
Java – anonymous variable (?) Advantages?
I want to know something suddenly came to my mind yesterday We can do this (in Java): ObjA instanceA = new ObjA(); Obj…… -
Java – generic type parameters depend on itself
I encountered the following situations: I understand this: In the type parameter part of the class, if s is the bounda…… -
java – EJB3 / JPA @Transactional
Is there an EJB or JPA annotation equivalent to spring's @ transactional? Solution The equivalent EJB 3 attribute is j…… -
Java – understand the last value and value returned by try catch
I have the following code public static void main(String[] args) { System.out.println(returnString()); } private s…… -
Java – return try block in block vs return block
I have a try statement in a small static method. Is there a best practice for where I should return? try { mightTh…… -
Java – is there a way to expose hibernate entities as restful resources without dto?
I'm developing a simple webapp that exposes the domain model as a restful resource When grouping hibernate entities in…… -
Java – when should I use inputstreamreader and outputstreamwriter?
From the Java Tutorial site, we know that inputstreamreader and outputstreamwriter can convert streams between bytes a…… -
Java – sonar flag “bad practice”: if the class is extended, it may not be safe to use getresource in XYZ
Sonar pointed out this error in our java project Welcome any suggestions on safe programming! URL url = getClass().get…… -
Java – how to avoid instanceof when using list in design pattern
Imagine that you have a menu and each dish should be in multiple languages (French, English, Arabic...) The dish class…… -
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Java – add jar classpath in Ubuntu
This may be a common problem, but I can't add Classpaths to jar files in Ubuntu I have given all the details I know be…… -
Java – Maven jetty plug-in daemon elements are not allowed here
I'm trying to configure the project's POM XML file I want it to start the jetty server during the test phase To do thi…… -
Java – MapReduce job without mapper
This may be a very basic question, but it is still helpful for many novices like me Can I do Mr work without a mapper?…… -
Java – separate Classpaths for test code and main code
I have two source code trees in my eclipse Java application One is "SRC" and the other is "test" Each contains Directo…… -
Java – parsing XML from httppost response
During HTTP post, I store the response as a string response HttpResponse httpresponse = httpclient.execute(httppost); …… -
Java – use beans to send mail from JSF pages
I am using JSF and primefaces to create a web application. My problem is how to send e-mail through the contact form o…… -
Java – Apache beam – integration test of unbounded pcollection
We are building integration tests for the Apache beam pipeline and have encountered some problems For background infor……