Java
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Why not StringBuilder= (string) in scala?
This behavior seems to be broken (I'm using scala 2.9.1) var b= new StringBuilder All right: b+='a' b.append('b') b.a…… -
How does Java choose which constructor to use?
I can't understand the output of the following program public class Confusing { private Confusing(Object o) { …… -
What has been added to Java – outofmemoryerror and how?
I have a very long collection with 10K project that crashes when running a toString () on an object I need to use this…… -
java. io. Is buffer * stream different from ordinary stream?
1) How do buffered streams work in the background, how are they different from normal streams, and what are the advant…… -
Deadlock in Java: when occurs
I'm developing an application for J2ME. Sometimes it's completely frozen. AMS takes a long time to close it In my opin…… -
Although the serializable interface in Java has no methods and no fields, it can realize its functions What about?
Although Java io. Serializable interface public interface serializable {} surprisingly does not contain any methods an…… -
Java – can I specify a class wide group on a TestNG test case?
I have a base class to represent database tests in TestNG. I want to specify that all classes extended from this class…… -
Java – how to clear bad characters that are not suitable for utf8 encoding in MySQL?
I have dirty data Sometimes it contains characters like this I use this data to query WHERE a.address IN ('mydatahere'…… -
Java’s better way to delete files (if any)
We need to be in file Delete () before calling file. Exists() before deleting the file File file = ...; if (file.exis…… -
Java – why do we need to synchronize on the same object to make notify () work
I got Java lang.IllegalMonitorStateException. I mentioned this problem and it solved my problem The first answer is To…… -
Java – how do I check if a thread terminates?
When does the thread reach the termination state? When the end of the run () method is reached, will it be terminated?…… -
Which mobile phone supports which J2ME (Java Micro Edition) specification?
I can't find the latest chart on which mobile device supports which Java I'm particularly interested in Nokia smartpho…… -
Java – how to get int values from a spinner
I use NetBeans 7.1 to write Java I have a JFrame. I have a spinner with integer value on it. I want to know how to get…… -
Java generics and return types
I've just come across something I don't understand Why is every loop illegal when the second is the same? public inter…… -
Is there a Java geometry library? (not JTS)
I want to be equivalent to CGAL (c) – I want convex partitions of polygons or at least triangulation It must also be f…… -
Java – how to solve ‘define and throw special exceptions instead of using general exceptions.’
When the length of the two lists is not equal, I need to throw runtimeException We use the sonarqube tool for code rev…… -
Java – Proguard does not obscure jar dependencies
I have a project with POM given below XML file When I issue the command MVN clean compile assembly: single install, I …… -
Java – simulate a spring validator when unit testing the controller
When coding the unit test postmortem into the code created by another project, I encountered the problem of how to use…… -
Java – how to identify whether a string contains special characters that cannot be stored using utf8-mb4 character sets
Please refer to this tweet and the thread below. We are trying to store similar tweets to the database I can't store t…… -
Java – use huge memory in notifications
I am developing a service application that displays the progress of the timer in the notification area (with progress …… -
What is the difference between const and volatile pointers?
What is the difference between const and volatile pointers? Solution The difference really comes down to the differenc…… -
Java – optimistic cache concurrent design pattern
I have a web service running on a set of servers The network service performs some internal processing, and then you c…… -
Java – relative to the current date in the Dbunit dataset
I wonder if there is any way to specify, for example, tomorrow as the date in the Dbunit XML dataset Sometimes the cod…… -
Java – how to convert jsonobject to gson JsonObject？
I have an org json. Jsonobject object Create gson. From What is the simplest method of jsonobject object? thank you So…… -
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……