Java
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Java – fair setting in semaphore class
I'm trying to understand the usefulness of fair property in semaphore grade Specifically, reference Javadoc to mention…… -
Java – spring JPA / Hibernate: failed to import bean definition
Hitting my head against the wall for several hours can't solve this problem. It seems to be an error in my configurati…… -
Java – recursively find the nth element in the linked list
I'm practicing basic data structures. I have some difficulties in recursion I understand how to do this iteratively, b…… -
Java – code color styles in eclipse
A good simple question: is there anything similar to http://studiostyl.es/ Eclipse? Update: since I use this link to l…… -
Java – how to assign method reference values to runnable
I discussed the problem of Java 8 runnable public static void main(String[] args) { Runnable r1 = Test::t1; Ru…… -
Java – finds the number of active sessions created from a given client IP
Is there a way to determine the number of active sessions created from a given client IP address? Solution The standar…… -
Java – reverse color
I have a user setting where they can choose the color of the alarm The alarm is the background color on the text or bu…… -
Java – GWT: gotcha’s
My team is starting its first GWT project We are quite powerful for swing applications, and almost all our work involv…… -
Is there a “best” or most popular database with stand-alone Java applications?
Is there a "best" or more popular database with stand-alone Java applications? Update: talk about small applications (…… -
Java – jasperreports is exported to xlsx instead of XLS
I can't find how to export jasperreports 4.1 1 Xlsx file JRXlsExporter There is no xlsx equivalent I can't find a para…… -
Java – Android – open or restart the application after clicking the push notification using the flag activity
I use push notifications in Android When I receive a push notification, if the application is still running, I want to…… -
Create a zero int array in Java
How do I initialize all elements of an array to 0? for example int[] array = new int[10]; return array[2]; Should retu…… -
Java – maps strings to integers
The simplest method in Java is to map a string (Java string) to a (positive) integer (Java int) >Are equal strings …… -
Java – split screen in libgdx
The question is short and simple How to create split screen effect in libgdx If I create two cameras, it will draw one…… -
Java – factory pattern dynamic method
I'm trying to understand the factory model If there are many implementations, there will be many switch cases in my fa…… -
Java – it makes sense to override the methods in the interface
There is already an answer to this question: > why Java 6 overrides keyset(), entryset() and values() interface in …… -
Avoid checkstyle magic number errors in JDBC queries
I'm having a group project in class. We're trying checkstyle I'm very satisfied with Java, but I've never touched JDBC…… -
. Net and Httpwebrequest are equivalent in Java?
. Net has Httpwebrequest and webclient to simulate browser requests I will Google, but I don't know what keywords to u…… -
[ljava. Lang. object; cannot be discarded
I want to get the value from the database. In my case, I use list to get the value from the database, but I receive th…… -
Java: cloning arbitrary collections by referencing collections
Suppose you have a method of type Java util. Collection, and it can't be said which Java it will point to at run time …… -
Java – why do we have immutable empty maps?
/** /** * Returns the empty map (immutable). This map is serializable. * * <p>This example illustrates the t…… -
Java – WebService call timed out from the client
I am using resteasy client to call WebService One requirement is to abort / timeout the call if the running time excee…… -
Java – how to create a global variable in Android?
See English answers > 12 Android global variables I've tried to put it in a custom class, but the problem is that i…… -
Java – use App Engine to customize the data storage location on the local computer
I am developing App Engine Application in Android studio and testing it on the local computer (using local data store)…… -
Java – why compile code with consecutive semicolons?
According to my scientific Java experiment, int x = 0; Equivalent to int x = 0;; This is equivalent to int x = 0;;;;;;…… -
java. Lang.illegalargumentexception: the observer is null
A user of one of my applications reported this error I'm confused about how to solve what it means After a Google sear…… -
Java – Android support library: getdrawable independent vector or not
When using Android > = 5.0, Drawable d = getResources().getDrawable(R.drawable.icon) Parse the XML correctly and re…… -
Java – anti hacking solution for secret keys in Android applications?
I need to store a private string key in the application Its value never changes and is set manually in the code I can'…… -
Java – cachedrowsetimpl cannot resolve to a type
I am using cachedrowset to save the resultset form dB CachedRowSetImpl crs = new CachedRowSetImpl(); But eclipse remin…… -
Java EE – inject @ EJB beans according to conditions
A novice question: can I inject different beans according to the conditions I set in the properties file This is what …… -
Java – convert bufferedimage to byte without I / o []
Hi, I have a buffered image instance in memory and want to convert it to byte [] to encode it into Base64 string witho…… -
Java – how to programmatically kill a storm topology?
I'm using a Java class to submit a topology to the storm cluster, and I'm also going to use a Java class to kill the t……