Java
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What kind of things can you use Java instead of Python?
I will choose a new programming language, Java, and have been using Python for some time But it seems that most things…… -
java – PropertyNotFoundException：Target Unreachable,’null’returns null
See the English answer > identifying and solving javax el. Propertynotfoundexception: target unreachable7 WARNING: …… -
How do I attach to a Java exception?
I am a novice and general exception to Java In my previous days of C / Perl programming, when I wrote a library functi…… -
Java – capture outofmemoryerror
Is there any memory error (Java. Lang. outofmemoryerror) in Java? Solution Yes Here are several examples to illustrate…… -
Java – retrieves the first number of a number
See the English answer > return first digit of an integer18 int number = 534; String numberString = Integer.toStrin…… -
Java – spring does not have an XML hibernate mapping class
In my ApplicationContext XML, this is how I map XML to POJO How do I map directories to class files without creating X…… -
Java – thread safe date parser
I am looking for a thread safe alternative to simpledateformat Parseobject is not implemented in the old fastdateforma…… -
Java – how to determine if the incoming connection is from the local computer
I have a socketserver that accepts incoming connections For security reasons, I should only allow local connections (f…… -
Does Java – mybatis implement JPA?
An easy question, I think Solution No, ibatis is not an ORM mapper like hibernate, so it does not implement JPA JPA is…… -
SBT java. io. IOException: not in gzip format
The windows 7 Pro computer did not shut down properly When the machine is restarted, running 'SBT test' will cause thi…… -
Java – how to limit the file types uploaded to spring mvc3 controller
I am using spring MVC 3 to handle the file upload of my web application Now, I can limit the size of the file being up…… -
JMX – MBean simple chart monitor
I have some JMX beans that expose performance information in my application I want to draw an MBean attribute in the d…… -
Java – detect objects (words) in images
I want to realize object detection in license plate (city name) I have an image: I want to detect whether the image co…… -
Java – how to determine if the incoming connection is from the local computer
I have a socketserver that accepts incoming connections For security reasons, I should only allow local connections (f…… -
JUnit – main difference: mockito and jmockit
This is what I found when I first tried to use jmockit I must admit that I found the jmockit document very concise abo…… -
Java – Scala divided by zero produces different results
I'm confused about how Scala handles division by zero This is a repl code snippet scala> 1/0 java.lang.ArithmeticEx…… -
Simple adapter problem, fine tune text image Java,Android
Greetings to all ArrayAdapter healthadapter = ArrayAdapter.createFromResource( this,R.array.health…… -
Create an array without declaring size – Java
I've been discussing the same problem, but I can't find the same one as me I want to create an array without declaring…… -
Java – how to implement the same interface multiple times, but with different generics?
There is already an answer to this question: > how to make a Java class that implements one interface with two gene…… -
Java – why can’t object [] be converted to string []
>No error Object[] a = new String[]{"12","34","56"}; String[] b = (String[]) a; >No error Object a = new String[…… -
javax. Persistence field, comment of getter or setter?
I am learning hibernate and Java persistence API I have a @ entity class that needs to annotate each field I've listed…… -
Java – run “MVN package” on “build project” in eclipse
I have Maven java project during the solar eclipse I right click the project and select "build project". I want "MVN p…… -
How to configure Xdebug using Wamp
I'm using Wamp 2.0 and trying to install the Xdebug extension for PHP I have followed all the steps written here http:…… -
Multithreading – creating threaded local objects on Scala
I'm writing a computing library in scala Similar functions I grouped into local Scala singleton objects containing som…… -
Java – create immutable objects using JAXB
I am using JAXB to create Java objects from XSD files I'm creating immutable wrappers to hide JAXB generated objects (…… -
Java – how do you ensure that multiple threads can safely access class fields?
How do you maintain thread safety when accessing class fields through getter methods through multiple threads? Is the …… -
Java – when using HashMap, the values and keys are guaranteed to be in the same order during iteration?
When I iterate over values or keys, are they related? Map the second key graph to the second value? Solution No, not n…… -
Java – how to create MVC based applications without using frameworks
Struts, spring and several other frameworks implement MVC architecture to separate the representation of information f…… -
Java – set the default value to a variable when deserializing with gson
I'm trying to convert JSON to Java objects When a value of a pair is empty, some default values should be set This is …… -
Java – why are private fields on enumeration types visible to containing classes?
public class Parent { public class Parent { public enum ChildType { FIRST_CHILD("I am the first."),SECON…… -
Declare a byte array in Java
How to declare a finite byte array? That's what I'm thinking, but it doesn't work. I can't find anything private Integ…… -
Java – how to put scanner input into an array… For example, several numbers
Scanner scan = new Scanner(system.in); Scanner scan = new Scanner(system.in); double numbers = scan.nextDouble(); doub……