Java
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Java – how do you call the paint method in the Applet extension class?
I have two called paintme Java and starter Java class file import java.applet.Applet; import java.awt.*; public class…… -
Why are there exceptions to the following java code?
Why do I get exceptions Exception in thread "main" java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to…… -
Java – string foo = “bar” and string foo = new string in Android (“bar”)?
I searched for this, but the keywords must be too generic to narrow the relevant bits Why are both ways of declaring s…… -
Java and C 11 volatile
I want to port some code from Java to C 11. I'm confused about volatile keyword I'm not familiar with the Java languag…… -
Symfony – complex doctrine2 query with optional parameters
I want to know the best way to query the database with optional parameters For example, I have a search, its name, loc…… -
Java – Jfilechooser in JPanel; How to let users choose
The default Jfilechooser works, but what I don't like is the fact that it pops up I'd rather have a GUI where all the …… -
Java – why doesn’t JPA automatically generate an ID for my row?
I want to use the sequence policy to automatically generate IDS, but I'm breaking my mind to make it work I have no id…… -
Java – how do you share a low-level utility class between packages without exposing it to a public API?
I have a library project. I want to restrict the public API, but I also have some low-level utility classes that are s…… -
Java me – is there a way to run J2ME (jar / JAD) programs without using the Sun Java wireless toolkit or any ide of J2ME?
I want to run my j2me program (jar / JAD) on my computer without using any ide or Sun Java wireless toolkit or somethi…… -
Format string in Java, in bytes
Suppose I have a string containing non ASCII characters in Java, I want to use string Format () so that the formatted …… -
Where can I download JRockit for Java 1.5
I checked the download page http://www.oracle.com/technetwork/middleware/jrockit/downloads/index.html , but only the J…… -
Generic / interface and tree structure in Java
I'm trying to create a tree structure (binary tree) that can accommodate two different types of classes (a sphere and …… -
Java – an effective way to parse the following strings?
I get the following response from the server as a string value_ One = 3342342& amps; value_ Two = 4563445& amp…… -
The compressed (zipped) folder is not a valid Java folder
I'm trying to use zipoutputstream to compress files from the server into a folder sourceFileName="./file.txt"' …… -
Java – JPA / Hibernate has too many increments for Oracle sequences
I use hibernate on my java project. I have Oracle dB For an ID column, I determine a sequence with an increment of 1 B…… -
A good java (Tomcat) soap Library
ANSVER： I have to develop a client / server system that uses Tomcat (6) as the server and the client created in C # T…… -
Java – how to write a method that accepts stacks and queues?
So I wrote this very big method If you give it a stack, it will return a stack If you give it a queue, it will return …… -
Java – error creating bean in quartz scheduler
I changed the quartz library from version 1.5 2 is changed to 2.1 2. Using its old version, the project runs and works…… -
Multithreading – why can’t signals / slots work with multiple threads?
class A : public QObject{ class A : public QObject{ Q_OBJECT signals: void a_sig(); public: A(){ } public sl…… -
In Java, enumeration What do you mean?
What is enumeration? > meaning? Is there any way to represent general purpose? Solution <？> Syntax is Java's…… -
What is the reason for setting the minimum Java heap size?
I can set the minimum and maximum Java heap size by passing the parameters - XMS and - Xmx respectively@ H_ 403_ 7@ So…… -
Java swing GridLayout vertical constraint
Can I add components in GridLayout vertical? I mean, the next one is higher than the previous one? thank you Solution …… -
Simple java Pokemon extinguishing simulator
I wrote a class to create and fight Pokemon, but I couldn't figure out how to call the battle method in the tester cla…… -
Java – modify color selector panel
I am creating a color selector and need to modify one of the color selector panels What I want is that I want to input…… -
Java – parsing large xlsx files, date format
Because the xlsx file may contain millions of lines, I decided to use the POI event model to sample from here (example…… -
Java – in wicket 1.5 (. 2), there is no component reloaded on the URL?
For the first time, I used the following URL to navigate to my application: In debug mode, I saw wicket instantiate my…… -
Occurs before the java thread starts
I read somewhere that starting a thread has some special effects on events before the relationship Now I'm not sure if…… -
Performance overhead using volatile for setjmp / longjmp
For setjmp / longjmp to work, you need to declare the local variable volatile If someone compiles their code with - O3…… -
Java – select the first index in the collection
I sometimes feel like I'm reinventing the wheel I want to know in Java / Jakarta commons / guava /? Whether there are …… -
Java code is equivalent to the following PHP code
The following PHP syntax may be Java equivalent: $newPerson = array( 'firstname' => 'First','lastname' =…… -
Java – how to use Guice to inject impl of some interfaces into Android activity
I use Guice 3.0 on Android to do some di I have public interface APIClient { } and public class DefaultAPIClient imple…… -
Multithreading – how do I call runnable using the spring framework?
I have a service that needs to call the runnable class Here are the lines of code used in my service @Autowired privat……