Java
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When to use ‘Java util. Objects.*’？
I'm browsing the seven functions of Java. They talked about Java util. Objects course What I can't understand is the f…… -
Java – file upload “multipart / form” exception org apache. commons. fileupload. FileUploadBase $InvalidContentTypeException
I tried to upload a file using Apache commons, but threw the following exception org. apache. commons. fileupload. Fil…… -
Java – classpath problem using xpathfactory
I encountered the following exception on one of the real-time servers (other servers running the same code seem to hav…… -
Java – J2ME networks, threads and deadlocks
The simple MIDlet code (class MOO) is locked (after excerpt) (at least I think it is locked after reading this article…… -
java – . Time format used in ICs file?
I'm creating one in Java ICs file, I need to know the date and time format to use This is the current format of my ICs…… -
Why is BigInteger in java designed to be immutable?
In Java, BigInteger is immutable, but I want to understand why, because it is often used to do many calculations that …… -
java – MyBatis 3.0. 1 insert questions
I decided to move one of my projects from ibatis to mybatis and encountered an insertion problem mapper xml： <?xml…… -
Java – read and write files that contain UTF – 8 (different language) characters
I have a file, It contains the following characters: “Joh 1：1ஆதியிலேஆதியிலே்த்தைதை்தது,அந்ததவாரதததைதைதைதைதைதைதைதேவனிட…… -
Java – how do I remember the last value in the swing GUI form?
I have a simple java GUI form made with swing It has some text input and check boxes, and I want it to remember the la…… -
Simple java pyramid – using system out. Printf() format output
Objectives: I am trying to generate a pyramid similar to the format given below This requires a basic Java program tha…… -
Java – realmobject and Parcelable
I'm new to real for Android, so I'm not sure if I'm getting close to this problem correctly I have a class that looks …… -
Java – get the first 10 values in the hash map
I tried to figure out how to get the top 10 values from HashMap I initially tried to use treemap and sort by value, an…… -
Java optimizer and redundant array evaluation
This is a very basic problem about Java optimization If you have a simple for loop, iterate over the array and use arr…… -
Java – CRC-16 with 0xa001 polynomial
I want to calculate CRC - 16 checksum of byte array with 0xa001 polynomial But I really don't know how to use it in Ja…… -
Java generics and number classes
I want to create a method to compare a number, but can have an input of any subclass of a number I see this in the fol…… -
Haskell – parallel strategy using Monad
I often see the use and interpretation of Haskell's parallel strategy related to pure computing (such as FIB) However,…… -
Are the default values of Java annotations compiled into bytecode?
I tried to implement several static analyses for Java bytecode They try to calculate whether a method has specific pro…… -
Java – learn about spring boot
I try to understand the difference between spring boot and spring boot web Starting from this boot tutorial, POM inclu…… -
Java – how to check how many threads are waiting for the synchronization method to unlock
Is there any way to check how many threads are waiting for the synchronization method to unlock? I want to know when a…… -
Java – push notifications in spring MVC webapp
I am writing a forum web application using spring MVC I'm just a beginner in spring. Now it's only a week I need help.…… -
Java – pass the parameterized class instance to the constructor
I have lost my way through the jungle, please help me:) I have such a thing: public class BaseClass<TYPE> { …… -
Java – project Euler problem #12
I have always been happy to challenge with project Euler. I noticed that my solution 12 is my slowest speed, reaching …… -
How to set a switch statement in a Java loop
I want to perform a switch in the while loop. At the break of each switch statement, the while loop stops and requires…… -
Unit tests – run JUnit tests using SBT
I have a 0.13 7 SBT project has several subprojects One of them is called webapp, which has many JUnit tests in webapp…… -
Java – unchecked exceptions will be better checked
I realize that in Java, the relative advantage between checking exceptions and unchecked exceptions is a be example di…… -
Java – OSS implementation of Google application engine?
After Google first launched map reduce, the community launched Hadoop. Is there an OSS Google App Engine project? Or, …… -
Java – code navigation in eclipse
I find it difficult to browse the code of a large project involving many classes, XML files, SQL files, etc I know shi…… -
Java – open the paradox / Borland Database as a single file
My question is: This is what I have: so it's a paradox 7 database file I'm trying the driver: http://www.hxtt.com/para…… -
Java – catch several exceptions and re throw the general exception
I'm using reflection to add some data to private variables in classes from third-party libraries There are about four …… -
Accelerating mathematical computation in Java
I have a neural network written in Java, which uses sigmoid transfer function to define as follows: private static dou…… -
Java – the comparator must override superclass methods
I'm making a treemap < < string, string >, and hope to arrange it in descending order I created the following…… -
Is there a map implementation for Java listeners?
I want a map implementation where I can add listeners for put () events What is available in standards or any third-pa……