Java
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Java – generate ECDSA signature using secp256r1 curve and sha256 algorithm – bouncycastle
I am trying to generate a signature using ECDSA with secp256r1 curve (P256) and sha256 algorithm for message hashing I…… -
Java – how do I call this class?
I have my main class to call a custom JFrame class called mainframe public class App { public static MainFrame mf; p…… -
How to automatically convert input characters to uppercase letters in Java
I'm using the scanner class to get input and want to convert the input to uppercase letters when displayed This is my …… -
Java – click the close x button to close the frame
I have got the answer through link1 and link2, but it doesn't help because frame.setVisible(false); The following exce…… -
Java – outofmemoryerror commented out from seemingly unrelated code blocks
Can anyone explain why the program throws an outofmemoryerror when the for loop is commented out? If it is uncommented…… -
Java – automatically connect to sleep interceptor
I'm extending hibernate Emptyinterceptor, in my implementation, I want to automatically connect to some services, but …… -
Java – on event dispatch thread – want to leave it
Suppose I have methods that are sometimes called on the event dispatch thread, and sometimes not Now suppose I want so…… -
Java – content resolver and “in” statement in “where” statement
I'm trying to get the cursor of the contact list based on therir ID I'm not sure how to use an "in" statement with an …… -
Java – redirect to another port, keeping all remaining ports
On the server (embedded jetty), I need to redirect to another port, leaving everything else unchanged, for example, re…… -
Java – what do I need to do to make liveconnect run again?
A few years ago, I wrote a Java Web start application in NetBeans, which performs a simple file upload task Over the y…… -
Java – access the shadowed variable in the local class
I'm new to Java, and I'm confused in the following example public class Test { int testOne(){ //member method …… -
Java – why is rt.jar not a classpath system attribute?
I use the system properties Java class. Path to find all jars and directories belonging to the classpath At the first …… -
Java – can I force GWT compilation without an entry point? (verify compatibility with GWT)
This question is related to this question, but not repeated My question is slightly different; I have a "utility modul…… -
Java – webtarget and thread safety
My understanding is that Jersey's webtargets are thread safe and can be called at the same time, but I have a concurre…… -
How to use java to get git information?
Is there any way to programmatically retrieve git information using Java? I want to know: >All branches in the curr…… -
Java – method of finding numeric factors
I'm trying to write a simple program that accepts a non - prime number and returns its first factor I must use a metho…… -
Concat two JSON objects in Java
I want to connect multiple JSON objects I have two JSON like this {"message":"test","status":"0"} And this {"message":…… -
Do you need to explicitly close the Java keystore input stream?
When using FileInputStream to read the following in keystore, do you need to explicitly close the input stream to stop…… -
Java – datastex querybuilder insert statement
What is the correct way to build insert statements using querybuilder from datastex Java driver for Cassandra I'm usin…… -
Java – is this integration testing or unit testing?
It's not just a real case, it's the problem I encountered when trying to get the detailed difference between unit test…… -
Is it effective to keep Java programs running indefinitely?
My program starts with main and starts some threads to execute the program work (reading sensors, updating databases, …… -
Java – when should encapsulation be used?
I am completing the sun / Oracle trail（ http://docs.oracle.com/javase/tutorial/java/TOC.html ）And constantly reitera…… -
Removes spaces and words that begin with a specific character from a Java string
Remove spaces and words beginning with specific characters from Java strings Code spaces are eliminated by the followi…… -
Java – filter directories in Maven war plugin
This is a follow-up to my question yesterday conditionally exclude some resources in Maven from war I can rearrange th…… -
Java – references a method with specified parameters (for lambda)
I have a way to verify that there are no negative numbers in the number list: private void validateNoNegatives(List<…… -
Audio processing using java
The smallest unit of digital image is pixel Solution The smallest sound unit is called a frame For 8 - bit mono, it wi…… -
Java – about map Confusion of containsvalue method
I have the following program, I have a HashMap The key of HashMap is a simple integer and the value is an array of int…… -
Java – using Otto, if I call it directly elsewhere, the method will only subscribe
I have a problem that one of my subscription methods will not be called for posts of the correct event type unless the…… -
Calculates the number of sequences in a vector
See English answer > How can I count runs in a sequence? 2 bin <- c(1,1,1) I'll get 5 I haven't found any existi…… -
Java – spring MVC with JPA data binding
My problem is to bind the data obtained by spring from the form to the JPA entity Strangely, if I don't look at bindin…… -
How to query bigquery through ODBC connection?
It would be nice to be able to use bigquery through ODBC I have used MySQL through ODBC, which allows me to switch to …… -
Java: implicit conversion of object at compile time does not work, but reflection can be used
The following codes are given: import java.lang.reflect.Array; import java.lang.reflect.Method; public class Test { ……