Java
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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…… -
Java – tag interface
Can anyone explain the contract of marking interface in Java? For ex: if clonable is a tag interface without fields / …… -
Java – use graphics2d to draw images with sub-pixel precision
I'm currently trying to draw images on the screen at normal speed, just like in a video game Unfortunately, due to the…… -
Use ‘STD:: vector’ containing incomplete types to recursively define and access’ boost:: variant ‘– libstdc vs libc
I tried to use the incomplete wrapper class and STD:: vector as my indirect technique to define and access the "recurs…… -
In Java cross plateform ably, there is no time to seed the random generator
I initialize two random number generators on two threads almost at the same time. I want the behavior of the two gener…… -
Java – how to verify whether an exception is thrown
In my unit tests using mockito, I want to verify that NullPointerException is not thrown public void testNPENotThrown{…… -
Java – use icons with jcheckbox
I have a swing application that I want to use with icons JCheck@R_244_2419 @I constructed the following icons: JCheck@…… -
Java – how to read specific excel columns using Apache poi
I encountered an excel problem when using Apache poi I can read across lines, but sometimes I'm in a situation where I…… -
Java – Android – listview onitemclick() is not triggered in 4.1 jellybean
I have a user who only installs 4.1 (frozen beans), and listview onitemclick() stops working in my application Events …… -
sun. net. www.http. Httpclient has a memory leak in Tomcat 6
I'm using Tomcat 6.0 18. After Undeploying my application, httpclient seems to hold a reference to webappclassloader, …… -
The spring repository method that returns the Java 8 stream does not close the JDBC connection
I have a spring data repository: @Repository interface SomeRepository extends CrudRepository<Entity,Long> { …… -
Java – Apache camel example inserts a row into a table
I want to exchange Insert body into the database table to get one of my routing conditions >Are there any sample / …… -
Java – no body message is displayed when sending attachments
When I send an attachment, I can't see the body message in the email (message. Settext (this. Getemailbody());) MimeMe…… -
Java – button text disappears in KitKat (API level 19)
The main menu of my application (a game) uses standard Android buttons In addition to nexus 7 and Android 4.4 All equi…… -
Java – about the precision of float type
I can't understand why float f = Integer.MAX_VALUE; System.out.println(Integer.MAX_VALUE); System.out.println((int)f);…… -
Java – default parameter in jar manifest
Is there any way to create a jar file that contains some parameters passed to the main class? (no need to add paramete…… -
Java multithreading in notebook computers with quad core processors
I'm reading a java tutorial that says that actual multithreading does not occur on a machine with a single processor I…… -
Java: can I use two different names in an enumeration to count the same thing?
I have an enumeration course with main directions (North, East, South, West): public enum Direction { NORTH,EAST,S…… -
Java – forkjoinpool – why does the program throw outofmemoryerror?
I want to try forkjoinpool in Java 8, so I wrote a small program to search all files with names containing specific ke…… -
jpa – persistence. XML is used for multiple persistence units
I try to hold the same entity in MySQL and Postgres databases (this is mainly to identify any inconsistencies and expl…… -
Creating general Lambdas with Java
In Java, you can add a type parameter to a static method to create a method that handles generics Can you do the same …… -
Java – how to use graduates to delete specific permissions when building Android applications?
Recently, Google automatically merged licenses from Google services to the final version of APK My problem is that som…… -
How to use Java 8 stream iteration nested for loops to reference parent elements?
I want to use the Java 8 stream to iterate over the nested list and extract some results of the list at the first matc…… -
Java – use ActiveMQ, camel and spring to implement the request reply mode
I'm trying to implement the following features: Then read the CSV file line by line: >Build the request according t…… -
Java – spring boot and thymeleaf – remove strict HTML error checking
I use spring boot as an MVC application, and my view technology is thymeleaf One thing I need to do is copy the HTML o…… -
Java – Android – can you publish different applications with the same keystore file in multiple accounts?
There is already an answer to this question: > can I use the same keystore file to sign two different applications?…… -
How to clear HTTP from Java?
I am trying to perform purge using httpurlconnection as follows: private void callVarnish(URL url) { HttpURLConnec……