Java
-
Memory size of Java 32-bit system int [] array
In Java, the memory used to occupy an int [] array of size n is equal to (4 N) * 4 bytes In fact, it can be proved by …… -
Java – how to initialize a servlet when the server starts
I wrote a simple servlet with init () and doget (), dopost () methods I have a request, I have an API, I need to call …… -
Java, httpurlconnection, and set the content length
I am setting the length of the content in my httpurlconnection for put urlConnection.setRequestProperty("Content-Lengt…… -
Convert the conversion date in Java to an integer and then to Delphi time
I have a server device configuration. I need to use UDP to change the equipment date configuration The server is writt…… -
Simple java XML to POJO mapping / binding?
I tried to find the easiest way to map an XML file to a simple old Java object Note: in my example, the XML does not m…… -
Javafx-2 – JavaFX: when the scene is initially loaded from fxml, a new node is added to the scene in the Java code
When a scene is initially loaded from F XML, how do I add a new node to the scene in Java code? Parent root = FXMLLoad…… -
Java – how to get the size of the visible part of a JScrollPane based window
This JScrollPane - based window is the top - level part of jsplitpane Getbounds(), getwidth(), getheight() return the …… -
Java – how to define the OSGi bundle startup level?
How to define the OSGi package startup level? I am using Apache Felix and want to maintain the starting level through …… -
Java – why does getcanonicalpath throw a checked exception while getabsolutepath does not?
I read some relevant texts to understand the difference between the two But I wonder why getcanonicalpath () throws a …… -
Java – inject mock @ service for spring unit test
I'm testing a class that uses @ Autowired injection service: public class RuleIdValidator implements ConstraintValidat…… -
Java – get a file from a remote mercurial repository
Is there a way to programmatically download a single file from a Java Remote mercurial repository? I asked a very simi…… -
Java – converts MIDI counts to names and octaves
Does anyone know anything in the Java world that maps MIDI note numbers to specific note names and octaves For example…… -
Java – multi level static nested classes produce incorrect output
When you run the following code, "x.q" instead of "a" will be printed as required by the language specification Soluti…… -
Do you need a defensive copy of Java enumeration types?
People should return so - called "defensive copies" of private reference types This is to avoid returning references t…… -
Java – play 2.5 3: Use dependency injection to get configuration values
I tried to migrate a play framework application from 2.4 to 2.5 3, and I have questions from application Conf file get…… -
Java – how to serialize classes?
When I insert the list into mongodb, there is a problem: Exception in thread "main" java.lang.IllegalArgumentException…… -
Commercial Java analyzers have an advantage over free ones The one in NetBeans?
Occasionally, I have to do some analysis of Java code. What I want to know is why my boss will investigate in business…… -
How to convert floating point numbers to 4 bytes in Java?
I haven't been able to convert such things: byte[] b = new byte[] { 12,24,19,17}; Become something like this: float my…… -
Java – httpurlconnection conn.getrequestproperty returns null
I'm trying to push some data to the URL of BES (mds_cs) @ h_ 502_ 2 @ when I set some request headers in my code and s…… -
Java – jtextarea auto wrap resize
So, I'm at JPanel (@ r_104_ 2419@Layout ）Jtextarea. On I also have @ R_ 104_ 2419 @ the stuffer fills the rest of the…… -
Matching non spaces in Java
I want to detect strings that contain non white space characters Now I'm trying: !Pattern.matches("\\*\\S\\*",city) Bu…… -
Download – IE9 streaming files to browser when suspended
I use the following methods to stream files (usually Excel or PDF) to my browser It operates by setting the location o…… -
Java – access annotations in UIMA
Is there any way in UIMA to access annotations from tokens as they are in the CAS debugger GUI? Of course you can acce…… -
Java – if you have only one write thread, do you need special concurrency?
Assumptions: >Only one specific thread can set a reference field (not long or double, so writing it is atomic) >…… -
Java checkstyle – constructor definition for wrong order
I have a course that looks like this: public final class OrderedSetList<T extends Comparable<? super T>> i…… -
What tools are available to audit changes to Java interfaces?
Does anyone know of any tool that can summarize the changes of Java interfaces between different versions? (by interfa…… -
Java – how to reload a resource package in a web application?
I use the resource bundle as a Java class to read values from the database When I update dB, I need to reload the bund…… -
Algorithm – the large O and Ω of the worst-case running time are the best cases, but why do you sometimes use Ω in the worst case?
I'm confused. I think you use big O runtime in the worst case. Ω is the best case? Can anyone explain? Not (LG n) the …… -
Java 8 stream – why is the filter method not executed?
See English answers > why does java8 stream generate nothing? 3 Stream.of("d2","a2","b1","b3","c") .filter(s -&…… -
Java – why are indexes inclusive but exclusive?
In Java API methods, such as: > String. substring(int beginIndex,int endIndex) > String. subSequence(int beginIn…… -
Java – when the field vars is final, do you need a getter?
In Java, the Convention (for me) is to make your field variables private and use getters and / or setters to access th…… -
Java – get the full string stack trace containing the inner exception
Java's e.printstacktrace() does not print all the details of the stack trace of the inner exception Is there a ready w……