Java
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Java – is there any way to create a basic array without initialization?
As we know, Java always initializes arrays at creation time That is, new int [1000000] always returns an array with al…… -
How can the Java – @ Autowired annotation be used for private fields?
See English answers > what is reflection and why is it useful? 21 Solution It applies to reflection Here you can fi…… -
Java – does any program recognize that it crashed last time?
What is the best way to let the (Java) program recognize the crash when it was last run, and display a message "it loo…… -
Java – is it acceptable to use the hamcrest matcher in non test code
I tried to find a clear answer to using hamcrest matchers in non - Test code I have done some research and have some c…… -
Java – what is the reason for the failure: “jarsigner: failed to try to rename {file} to {file}. Org” sign up with ants?
I received an error: When trying to sign a set of cans with ants in eclipse Ant build works well in this project and h…… -
Multithreading – prevents / removes threads from publishing messages to the main UI thread
My problem is that if a thread quickly publishes messages to the main UI thread, and if I update the UI at that time, …… -
Java n-dimensional array
I need to be able to have an n-dimensional field, where n is the input based on the constructor But I'm not even sure …… -
Java – spring MVC: Form: RadioButton of Boolean attribute
I just want to know how to use Boolean values in spring MVC forms I try to use this Code: My jsp: <form:radiobutton…… -
Concurrency – can a single process run in multiple cores?
Can a single process run different threads on different cores? (I think they can) @ h_ 301_ 3@ In this case, different…… -
Use the latest JRE instead of the old java version. Can I guarantee that it will work?
Suppose I have a java project encoded in Java 1.5. I use a newer version of Java, but set the target to 1.5 If the cod…… -
Java – find the largest connected component in the adj matrix graph?
I try to find a way to find the largest connected component in adj matrix graph For example: 0000000110 0001100000 000…… -
Parallel for loop
I want to use the go routine to parallelize the for loop I tried to use the channel, but it didn't work My main proble…… -
Java – multiple object types in an ArrayList
I have an abstract class named user, which can be created as student type or teacher type I have created an ArrayList …… -
Java – parent POM Invalid wrapper for XML, must be ‘POM’, but ‘ear’
Someone can suggest a solution, with the following exceptions I'm going to create a multi - module project The parent …… -
Why does my java RSA encryption give me an arithmetic exception?
Yes Net, I generated the following public key file: <RSAKeyValue> <Modulus>xTSiS4+I/x9awUXcF66Ffw7tracs…… -
Java – gridbaglayout: how to prevent invisible components from crashing
When making the components of the layout managed by gridbaglayout invisible, the arrangement of other components in th…… -
Does java have a static sequential initialization failure?
A recent problem here is to have the following code (and similar) to implement a singleton without synchronization pub…… -
Java stretch icon fit button
I'm trying to resize my icon so that it covers the entire button and is in the center of the button When I try, it str…… -
Java – how to create an ArrayList correctly?
See English answers > type list vs type ArrayList in java15 List<String/*or other object*/> arrList = new Arr…… -
How to create a universal date formatter in Java for Solr?
I have a request that you can pass the date in the following format before indexing the date to Solr The following is …… -
Java – Excel read error: invalid header signature How?
I am uploading an excel file from my browser I'm using poi. Jar But get wrong The two JSP files I use are as follows: …… -
Java API streams collects streams in the map, where value is TreeSet
There is a student class with name, last name, age and getter Given a student object stream How to call a collect meth…… -
Java EE – ejbclient0000025: no EJB sink to process?
I tried to connect from an executable Java application (not on JBoss locally) to a remote EJB on JBoss 7.2 locally How…… -
Cause: Java sql. Sqlexception: connection and managed connection org. jboss. resource. ADA independent
I have an application for JBoss, seam, hibernate and H2 I wrote a simple operation to import data from an external fil…… -
How does Java – JFrame work? Deep inside, how does it draw things?
Usually, when I create a class, such as customer, I give it some data fields, that is, public int IDnumber; And some m…… -
Java 8 HashMap high memory usage
I use HashMap to store qtable to implement reinforcement learning algorithm My HashMap should store 15 million entries…… -
Java – project setup using eclipse and mercurial
I'd like to make some suggestions on using eclipse to set up multi - Project workspaces In other words, I'm going to c…… -
Java – JMX monitoring using ZABBIX
I need to check the memory size and CPU utilization of my application, find ZABBIX as a monitoring tool, and hope to b…… -
Multithreading – is this a race condition?
Definition of competitive condition: racial condition or racial hazard is a defect in the system or process, in which …… -
Java – jsplitpane: is there any way to show / hide one of the panes?
I have a jsplitpane with two components a and B, but sometimes I want to be able to hide B to meet any of the followin…… -
Java – Android – why is using interfaces considered a best practice for communicating between activities and fragments?
In this document "communicating with other fragments", Google tells us that the best practice for transmitting activit…… -
Java – how to avoid concurrentmodificationexception when iterating over this collection?
I need to iterate over a series of projects & sometimes added to the collection at the same time However, if I add……