Java
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Java – bean validation: how to manually create a constraintviolation?
I have a specific scenario where I can only manually check violations later in the process What I want to do is throw …… -
Java – is delayed initialization using immutable data always thread safe?
I have two classes a and B: class A { private final String someData; private B b; public String getSomeDa…… -
Java – why are the best practices for static classes different in OOP?
I'm currently reading about Java best practices. I find that according to this book, we must support non static static…… -
Java – a better way to implement an empty while loop to maintain control
I'm playing the background audio. I want the control of the program to remain stationary until the audio playback is o…… -
Java – StringBuffer class and Chinese character encoding
I wrote a method to return a string containing Chinese characters public printChineseMenu(){ StringBuffer buffer; …… -
Java – hibernate does not create tables – spring MVC
I have a spring project and I'm using hibernation When I started the project, DB didn't change I tried the difrenf con…… -
Java – why does the swagger annotation generate API docs with a default path prefix
I use the Maven plug-in below to integrate swagger with my application I configured the following in my spring servlet…… -
Java – use regexp to extract values between parentheses
Before management, I try to extract the value between parentheses (and) to check the existence of the value Please hel…… -
Java – Eclipse Plug-in: run the code immediately after startup
I want to display a message immediately after the plug-in starts If I put my code in activator At the end of the start…… -
Why does this multithreaded Python program print correctly from 0 to 99?
This is the code from Queue import Queue from threading import * threadLock = Lock() def do_stuff(q): while True: …… -
Java regular expression: if the closing bracket is the last character in the string, match any number of digits in the parentheses
I need some help to save my day (or my night) I want to match: >Any number of numbers > enclosed in parentheses …… -
Java – Android slidinguppanellayout up slide event
I'm using https://github.com/umano/AndroidSlidingUpPanel. It works well, but I'm trying to find some ways to listen fo…… -
How to use the same add () method in two different classes
Is there any way you can use the same add () method between two different classes (add content to the array)? For exam…… -
Java – using action tabs and WebView
I want to have my application to display tabs at the top of the screen (make it work) and set up WebView. XML in the X…… -
Reading streams over HTTP networks using Java I / O
Now I'm trying to improve the performance of Java I / O I have some crazy questions about using Java I / O to read / w…… -
Java – smack 4 throws “sslhandshakeexception: validatorexception: suncertpathbuilderexception” on the connection
For the integration test of my XMPP stack, I set up a vysper server (0.7) on localhost Question: Caused by: javax.net.…… -
Java – is it a good habit to use atomicinteger as an alternative to variable integers?
I have the following situations: public void callMe() { AtomicInteger howManyOdds = new AtomicInteger(0); AtomicInte…… -
Mirrored shapes in Java (swing)
hello everyone, I have a lesson about drawing and manipulating shapes in swing GUI I have a problem. When I try to mir…… -
Is there an activity failure that occurs in concurrency in Java 8
I will try to reproduce the code mentioned in the following valid Java (Second Edition) public class StopThread { p…… -
Java – use drawLine to extend the graphics class (double, double, double, double)
Question: / / where the story begins You can see it's terrible Actual prototype: public abstract void drawLine (int x1…… -
Displacement differences in Java and C – how to reconcile
I have some code in C, I'm trying to migrate to Java, and there's a problem I can't solve@ H_ 301_ 7@ Solution C code …… -
Java – defaulttablemodel does not return the value in the datavector
My question is related to JTable and defaulttablemodel DefaultTableModel model=(DefaultTableModel)jTable1.getModel(); …… -
Why doesn’t Java seem to respect my classpath?
I have jt400 in my directory jar： /path /jt400.jar /Test.java Test. Java content: import java.sql.*; //impor…… -
Java – the scan count returns a number significantly less than the dynamodb table
I'm running a sample Java program to query the dynamodb table, which has about 90000 items, but when I get the scan co…… -
Java – find integer patterns in arrays
For this problem, I will write a method called mode, which returns the most common element in an integer array Suppose…… -
Java – requires multiple input from the user
I'm trying to write a program that keeps asking users for an integer until they enter a non integer value, and the pro…… -
Java – serialize the object containing the ArrayList object
public class User implements Serializable{ public class User implements Serializable{ public String name; …… -
Java – how to add JButton to JScrollPane?
Hi, I want to make a desktop application here. I'm using JScrollPane I want to add a multipul button to the JScrollPan…… -
Multithreading – forces Perl programs to use threads to use all CPU capacity
I have a laptop equipped with Intel Core I3 CPU. I want to create a simple program in Perl to use 100% CPU capacity My…… -
Error: Java io. IOException: bad value class: org apache. hadoop. io. Text is not a MyClass class
I have my mapper and reducer as follows But I got some strange exceptions public static class MyMapper implements Mapp…… -
java – android. support. v7. widget. GridLayout cannot be instantiated
I'm trying to use GridLayout in my project, but ideally I use the Android support library, so I can locate a lower ver……