Recent Posts
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Integer in Java ParseInt, when ” is the first exception
Integer parseInt( “ – 1000”); Returns - 1000 as output Integer. parseInt(“500”); Throw exception How can we recognize …… -
Jpa-2.0 – the @ manytoone relationship cannot be empty
I have a one-on-one relationship and I want to be free: @ManyToOne(optional = true) @JoinColumn(name = "customer_id",n…… -
Java – implementing thread pools in services
I'm trying to implement a service that will perform some work on several parallel threads when requested My implementa…… -
Bluetooth connection failure “java.io.ioexception: read failure, socket may be closed or timeout, read RET: – 1”
I'm trying to connect to the device through an application installed in nexus 5 I want to make an application like rai…… -
What’s the use of Java – persistenceannotation beanpostprocessor?
According to its Javadoc, persistenceannotation beanpostprocessor seems to be responsible for injecting annotation @ p…… -
Java programming layout recommendations?
I've learned to write programs from scratch, but I don't know how to design the layout and implementation of the progr…… -
Synchronization in vectors in Java
Vector in Java means thread safety and synchronization. How does it make threads safe I'm looking at the internal deta…… -
Java – what is the difference between creating unbounded and bounded arrays of wildcard types?
Why is this code valid ArrayList<?>[] arr = new ArrayList<?>[2]; But the following two are not? ArrayList&…… -
Java gets a collection of common types
There is already an answer to this question: > get generic type of Java util. List12 if(originalField.getGenericTyp…… -
Multithreading – many threads or as few threads as possible?
As a side project, I'm writing a server for an old game I've played I try to make servers as loosely coupled as possib…… -
JavaFX – CSS Style list
I have a listview and want the following: >Odd rows of white background color > listview: when the mouse hovers …… -
Java, how to delete integer items in ArrayList
Suppose I have such an ArrayList: ArrayList<Integer> list = new ArrayList<Integer>(); After adding operati…… -
Confusion causes verifyerror: expect a stack diagram frame
We are using the latest JDK 7 (U45) and Proguard version 4.10 Recently, our distribution failed. After confusion, the …… -
Java – disable items in JList
I'm using JList as part of the wizard to display all the steps to be performed (it also allows you to click one step t…… -
How can java thread priority be converted to OS thread priority?
How Java API thread priority (1-10) is converted to operating system level priority, because most operating systems do…… -
Java – VM error starting wildfly (JBoss) server
I have wildfly-10.0 0. Final available path variable set I'm using Ubuntu I also have jdk1 7.0_ 79. The problem I face…… -
When should I turn off Java Preparedstatement?
In the "using prepared statements" tutorial, it states that they should always be closed Suppose I have a function get…… -
Java – how to dynamically pass parameters to spring beans
I'm a novice in spring This is the bean registration code: <bean id="user" class="User_Imple"> </bean> <…… -
Spring – how to write mockito JUnit to exchange methods for resttemplate
How to write mockito JUnit is as follows: @Autowired RestTemplate restTemplate; ResponseEntity<?> execute(final…… -
Java – how to select all text in JTable cells during editing
I want the editor in my editable jtables to select all text in the cell at the beginning of editing I've tried a few a…… -
16 bit hexadecimal string to int signed in Java
I have a Java string representing a signed 16 - bit value in hexadecimal The string can be passed through anything fro…… -
Java – how to cancel asyncresttemplate HTTP requests if they spend too much time?
Since the beginning, I have always confused how to handle interruptedexception and how to cancel HTTP requests correct…… -
The best way to convert an existing Java project into an OSGi package
We have many components, and we want to modularize only a few to start with Want to know what is the best way (in the …… -
Java – copy clipboard manager that supports old and new versions?
I'm trying to edit text on Android. For another question, the most voting answer provides these lines, but when I use …… -
Java – is try / catch a resource consuming operation?
I've heard that it's more reasonable to return null in a method instead of throwing exceptions in a try / catch block …… -
Java – how does undertow do non blocking IO?
I use undertow to create a simple application public class App { public static void main(String[] args) { …… -
Displays morning, afternoon, evening, and evening messages based on time in Java
What do I want to do: Display message based on Good morning (12:00 ~ 12:00) > good noon (12:00 to 4:00) > good e…… -
Multithreading – busy cursor – why?
Can anyone give me a scene they think is reasonable? I think from the user's point of view, they are always a bad idea…… -
Java – Eclipse – source not found
I know this problem has been asked many times, but no proposed solution has solved my problem (or I haven't implemente…… -
Java – JSP, get and post parameters
I need to do some small tasks with JSP; It's a very new JSP. I wonder if it's possible to get only get or only post pa…… -
Why use Java’s asynchronous filechannel?
I can understand why web applications will use multiplexing (not creating too many threads) and why programs will use …… -
Why use Java’s asynchronous filechannel?
I can understand why web applications will use multiplexing (not creating too many threads) and why programs will use ……