Java
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java – inputstream. Available() is always 0
I don't know what happened to my code I made no mistakes and did not respond I'm writing data to serialport and activa…… -
In Java / Apache httpclient, you cannot use vertical / pipe bars to process URLs
If I want to handle this URL, for example: post = new HttpPost("http://testurl.com/lists/lprocess?action=LoadList|4018…… -
Java – resolve “duplicate definition of library class” in Proguard
I have a java project that contains the Xerces library When I process a project with Proguard, I receive a warning: No…… -
Java – create volley requests in different threads
I want to use the volley Library in different threads for requests This means that there is a connection in the data p…… -
Java commons cli with options for a list of possible values
Xinxin banner Xinxin 200 new 200 new 200 new 200 new 200 new 200 new 200 new 200 new 200 new 200 new 200 new 200 new 2…… -
What time do you use the Callable object to call call () in Java Executor?
Here are some sample code for example What I need to know is when calling call () on calllable? What triggered it? pub…… -
Java – separate Classpaths for test code and main code
I have two source code trees in my eclipse Java application One is "SRC" and the other is "test" Each contains Directo…… -
Java – should private instance variables be accessed in constructors through getter and setter methods?
I know that private instance variables are accessed through their public getter and setter methods But when I generate…… -
Java – trim struts 2 text string input
What is the best way to trim this string? Where is the best place to place the trim code? Suppose my JSP has the follo…… -
Java – how to export all my IntelliJ code styles to Editorconfig file?
I tried to develop a standard code style for my project, and I've found it http://editorconfig.org/ , this is a standa…… -
Java – preconditions library throws illegalargumentexception for notnull check
Do you know that Apache commons validate or guava preconditions is a good alternative. When checking whether the objec…… -
Java EE – how to instantiate multiple CDI / weld beans for a class?
In spring, you can instantiate any class by defining the corresponding bean in XML conf You can also instantiate multi…… -
Java – create a runnable jar that contains external files
I want to build a running jar. Jar in Java I need to include some files in the jar so that when I execute the jar, the…… -
Java – is there an SQL syntax aware swing component?
I'm looking for some Java Swing components (like textarea) that know SQL syntax - which means it can recognize and hig…… -
How to create a linked list array in Java?
So I need to input the edges of a bipartite graph like this: 6 1 3 1 2 1 5 2 7 2 4 2 9 The first number is the number …… -
Java – parsing XML from httppost response
During HTTP post, I store the response as a string response HttpResponse httpresponse = httpclient.execute(httppost); …… -
Java – using messagepack with Android
Has anyone tried to use @ l_ 502_ 0 @ app using messagepack? Caused by: java.lang.ExceptionInInitializerError at org…… -
Java generics and collections reading reference
Although I know some working knowledge of generics and collections, I can also say that I have some experience in usin…… -
Java – when to use hibernate connection. provider_ class
When should I use hibernate connection. provider_ class？ Me and 'hibernate connection. diver_ There is a bit of confu…… -
Java-8 – delete the “05:30” section from java8 localdatetime to xmlregistry calender
As shown below, LocalDateTime currentUTCTime = LocalDateTime.Now(ZoneId.of("UTC")); String reqPattern = currentUTCTime…… -
Java – how to run methods asynchronously using spring?
The following code assumes asynchronous work, but waits for the async part to complete and then continues How do I mak…… -
Java – cannot instantiate a type in a generic
I have this course public class Tree<T> { //List of branches for this tree private List<Tree<? su…… -
Randomize text files read in Java
I try to read a text file in Java, which is basically a set of problems There are four choices and one answer The stru…… -
Java – use the abstract init() function in the constructor of the abstract class
I have something like this: public abstract class Menu { public Menu() { init(); } protected abs…… -
Converting images to 2 colors in Java
I want to use java to convert the image to 2 colors, black and white I am converting to grayscale using the following …… -
Java nosuchmethodexception when getting constructor
I tried to use reflection to load instances of classes When I tried this, I got an exception without this method I'll …… -
Java – does hibernate / JPA consider transiant modifiers (not annotations)
I want to avoid serialization (in JMS / AMF), but still use JPA / hibernate to hold fields Is the transient modifier m…… -
Java – how to animate a gyro?
It's Hanukkah, and I'm trying to animate the Dreidel: I can make it rotate on its own axis This is my code: import sta…… -
Java – won’t Android studio let me use switches on strings?
I'm creating an Android Application in Android studio and trying to create a switch case on the string As far as I kno…… -
Java – why do I throw a NullPointerException
So it's a winter vacation for college, and I'm trying to be sharp in coding, so I just write the code of programs and …… -
How to calculate a good hash code for a large list of strings?
What is the best way to calculate a hash code based on the value of these strings in a pass? OK, I mean, it needs to: …… -
Java – tag interface
Can anyone explain the contract of marking interface in Java? For ex: if clonable is a tag interface without fields / ……