Java
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Rest Java Web services use protobuf
I want to use Java & protobuf Anyone can point out where to start or how to achieve it? Any good tutorials? thank …… -
Java – why does a single threaded process execute on multiple processors / cores?
Say I run a simple single threaded process, as follows: public class SirCountALot { public static void main(String…… -
How to start RMI registry through Java code?
I write Java programs for clients and servers However, to run this program, I need to manually start the RMI registry!…… -
How to correctly use @ checkfornull, @ nonnull and @ nullable annotations of findbugs
I want to formally annotate my function signature to clarify their contract - especially if NULL params and return val…… -
How to generate program dependency graph (PDG) from bytecode in Java
I want to generate a program dependency graph (PDG) from Java bytecode for further programmatic analysis Since this is…… -
Java – internal class extension
In Java, I have the following classes: public class A{ protected class B{ } } Can internal classes be extended in …… -
Java – when does recursive backtracking apply?
I'm creating a sudokusolver for a class, and I'm having trouble solving it My current solution uses recursive backtrac…… -
Java – manually add songs to mediastore as music tracks
I want to create a music player that can download songs online and add them to the mediastore I am using the download …… -
Java：JFrame. Setlocationrelativeto (null) is not available as Ubuntu 10.04 / Gnome 2.30 2 window centered openjdk 1.6 0_ eighteen
Example code: JFrame jFrame = new JFrame("Test"); jFrame.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE); jFram…… -
The class generated by Java – querydsl cannot access the second level element for query
I use querydsl with spring data JPA in my java project, and use the file generated by querydsl Maven plug-in to use th…… -
Java – check the checkbox selection in the listener
At present, we are working hard, but Jface has encountered a small problem This is the code Button btnConfirm = new Bu…… -
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 – Common underflow and overflow exceptions
I tried to get an overflow and underflow exception in Java, but I couldn't get any beautiful tutorials Specifically, I…… -
Equivalent to akka, but Net (concurrency framework)
Is there the equivalent of akka Net? http://doc.akka.io/use-cases Solution You can have a look https://github.com/phat…… -
Java – how to define whether the determination point is in the area lat, long?
I have an area defined by a set of geographical locations. I need to know whether a coordinate is in this area public …… -
Java – type prompt functions in clojure
I tried to solve the reflection warning in clojure, which seems to be due to the lack of type inference for the functi…… -
Java – what happens if the executorservice queue is full
I have a large file up to TB. My task is to process it line by line Each line should take 5 seconds to complete To imp…… -
What does colon mean in Java?
What does a colon mean in Java? I have this: public static List<String> findAllAnagrams(List<String> words…… -
Java – how to create a text field that only supports numbers in vaadin
I'm using vaadin text field. I want to limit it to numbers only I tried to override setValue () and return without cal…… -
What type of Java constructor call is this?
I've never encountered such a thing. I don't know this type of coding! DefaultHandler handler = new DefaultHandler() {…… -
Java – JPA last update timestamp
I'm playing JPA (eclipse link is specific) The following entities have one What is the policy for automatically updati…… -
How do negative operands of bitwise operators work in Java?
-4 & -5 = -8 // How? -4 & -5 = -8 // How? -4 & 5 = 4 // How? I need to explain how to achieve the above re…… -
Java – what is the appropriate way to handle warnings: “the expression of X is loaded into X”
I'm not going to close or ignore the expression of type X is boxed into x? Warnings in I wonder if the correct way to …… -
Java – how to prevent hibernate from eagerly obtaining many to one associated objects
I have an attribute in a domain object that is declared in a many - to - one element The basic syntax of this attribut…… -
Java – determines whether a file is a connection (in Windows)?
I've been looking for a way to determine whether a file is a connection point, and I haven't found any satisfactory an…… -
Java – draw text in JPanel
I'm looking for the most basic description of how to draw text in JPanel I know there are a billion tutorials, but non…… -
Java – how do I create a treemultimap from an Iterable / collection?
I'm pruning a tree Multimap and returning the same structured tree Multimap (but pruning) For example, I have differen…… -
Is there any way to force a class to use the public static final field in Java?
Is there any way to force classes in Java to have public static final fields (through interfaces or abstract classes)?…… -
java – Float vs Double
Is there a case where compare (equals()) between two floating-point values returns false if they are compared to doubl…… -
How to create JSON arrays in Java
I have a JSON structure as follows How do I create this array structure programmatically? JSON structure: { "Employee…… -
Unit test code and Java 8 Lambdas
I've been using java 8 for several months, and I've started using lambda expressions, which is very convenient in some……