Java
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Java – string literals and permanently generated memory areas
When we say that the actual string is stored in the permanent generation area, the same applies to string text? Or is …… -
Determines whether the current thread holds Java ` lock`
Suppose I have a Java util. concurrent. locks. Instance of lock Can I determine whether the current thread holds a loc…… -
Java – restlet server resources required to use constructors
Get this error in restlet: ForwardUIApplication ; Exception while instantiating the target server resource. java.lang.…… -
Java – compare any similar values of two arrays
See English answers > most effective way to return common elements from two string arrays 6 Find the scheme #1:2 in…… -
Java – displays the tree on the JSP page
I need to display the tree on the JSP page How can I do this? I have the following objects: public class Node { pr…… -
How to set the default file name of swing Jfilechooser?
I want to set the default file name to untitled. In this Jfilechooser text box txt. Can I set it? Solution Use the fol…… -
Java – unit testing using Apache Mina as an emulated / in memory SFTP server
I'm working on how to use Apache Mina Their documents are a little inadequate for my powerless brain I've seen useful …… -
Code snippet for creating a file from the contents of a blob in Java
I have some files stored in the blob column of the database in Oracle 9 I want to store those files in the file system…… -
Java: datainputstream replaced with byte order
The following is my code to replace datainputstream to wrap an InputStream, but in addition to the common method of re…… -
Java – hibernate criteria: different entities and then restrictions
I have a standard to return all the data required by the application, basically: Criteria criteria = session.createCri…… -
Converting Java applications to Mac OS X applications
Is there a way to convert Java applications to Mac OS X executable applications? I use NetBeans to develop java, and I…… -
Populate check boxes in JSP pages with data from JavaBeans
I have a JSP page with check boxes in the HTML form, as shown below Now, when editing user skills, I want to get comma…… -
“Synchronized (this)” vs. “synchronized ((baseClass) this)” in Java
Is this variable being safely accessed by using synchronization? Heirs of For the following procedures, Class SubClass…… -
Java – spring: file upload restful Web Service
I am using spring 4.0 to create a PoC for restful web services @RequestMapping(value="/getcontent/file",method=Request…… -
Java – how to understand Maven dependency tree
Please forgive me if this is a dump problem, but I searched a lot and didn't understand how to actually read Maven dep…… -
Java – the error message “attempt to split long or double on the stack” indicates?
The following error occurred in my code: I am ignorant of the origin of this error and do not know how to debug it Wha…… -
Java – how to create docker image files and value parameters for local applications
I have a Java application (jar file) that I want to be able to run from the dock image I created a docker file to crea…… -
How to configure Java imported organizations in NetBeans
At present, NetBeans (I use version 7.3.1) has the built-in function of organizing java file import through the menu s…… -
Java – deploying spring boot applications in Weblogic
I deployed a spring boot application in Weblogic 12C 10.4. 4 403 prohibit the server from understanding the request, b…… -
Java – “with private access” errors and generics
I have a problem I can solve myself, but I still don't understand why my original code doesn't work, or if there is a …… -
Java – is this object mutable?
If I have such a class: @ h_ 301_ 2@public class MyObject { private int myField = 2; public void setMyField(int f) { t…… -
Java – have I implemented equals and hashcode correctly using Google guava?
I am using hibernate and need to rewrite equals and hashcode () I chose to use Google guava's equals and hashcode assi…… -
Java – what about Dagger’s custom range?
How to create a custom range with dagger? Are there any guidelines? I didn't find them I am developing vaadin applicat…… -
java – WSContext. Getuserprincipal() returns null for password digest validation
In my web service, I need to record the caller's ID, but wscontext Getuserprincipal() returns null, even if the user a…… -
Java – comparison of positive and negative zeros
Why is java inconsistent when comparing - 0.0 and 0.0? What is the Java standard way to compare numbers to - 0 / 0? I …… -
Java – best practices for controlling access to “. Internal” packages
I write eclipse plug-ins and export some classes as APIs, while I want to restrict access to other classes I follow ec…… -
Java – the best way to compare enumerations
See the English answer > comparing Java enum members: = = or equals()? 16 Color c1 = Brown,c2 = Red What is the bes…… -
java. Lang.illegalstateexception: cannot perform this operation after onsaveinstancestate: – fragment error
Hi, I use segment a and the second segment B. call B and use the asynctask method, but I use this first time, it works…… -
What’s the difference between Java’s equals () and C’s operator = =?
When a question regulating the use of typeID is C, I suggest it can be used to compare types in objects I don't see it…… -
Java – does explicit locking automatically provide memory visibility?
Example code: class Sample{ private int v; public void setV(){ Lock a=new Lock(); a.lock(); …… -
Java – using maven, OSGi, and bndtools
Today, I was asked that using Maven in our current OSGi application is a good idea We use bndtools and it's great beca…… -
How do I check the number of threads currently running in Java?
I'm looking for a way to see how many threads are currently running >First > programmatically via windows Soluti……