Recent Posts
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Java – repaint swing JComponent after interval
I was assigned a project and I had to use the Gregorian calendar object in Java to make an analog clock First, we are …… -
Java – create variables in advance to use (?) in the loop
Which of the two is more "effective": for (int i = 0; i < 10; i++) { int x = i * 2; } Or – int x; for (int i = …… -
Java – cellrenderer and editor reset when new columns are added
I have a table where my columns expand dynamically Initially, I set my table model to 5 columns because the basic info…… -
Java – unbounded wildcard passed to method
@H_ 301_ 7@public class ColTest { static T wildSub(ArrayList holder,T arg){ T t=holder.get(0); return t; } public s…… -
What mechanism does Scala have for generics and wildcards compared to Java?
I often push the limits of the Java type system by using Guice, typeliteral, generics and wildcards I often encounter …… -
Java – spring using security: authentication principal in the link username
OK, this should be a simple one In the header In the JSP x file, I want a link to guide authenticated users to their u…… -
Java JSON parsing
Well, I've been trying for three hours now Using a lot of APIs, it still doesn't work properly I'm trying to parse { …… -
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…… -
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…… -
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 …… -
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…… -
Java – display buttons at specific coordinates
How do I display the (x, y) of a button or JButton window at a specific coordinate? Solution Although you can use setl…… -
Java – JTable line color depends on the value in the model?
I have this code in the table model: public class DocumentProjectTableModel extends AbstractTableModel{ private L…… -
Java – is it a good habit to use HashMap to index object lists?
I need to find objects through properties One option is to iterate over the array of objects and check each object who…… -
Java – how do I replace multiple items in a list?
I added a few characters to the list to replace it with a string Here they are: List<Character> list = new Array…… -
Java – invocationtargetexception: the plug-in (bundle) “org. Datanucleus” has been registered
I'm trying to follow dataoucleus tutorial for JDO I'm using maven, and I've followed the enhancer instructions provide…… -
Java should not be encouraged net. Httpurlconnection, because org apache. http. client. Is httpclient better?
I still see people using httpurlconnection to communicate with websites The forum also has many issues related to http…… -
How to develop producer consumer like applications in Java?
I have to develop an application similar to the producer - consumer problem in Java But I don't know much about Java. …… -
Java me – DateField of lwuit?
I wonder if lwuit has any DateField / datepicker components? Or, will there be any workaround for the implementation d…… -
Java – Hello world by Jersey and Grizzly (from User Guide)
I'm looking at the Jersey user guide and trying to set up the Hello World sample using the Jersey web service and the …… -
Java – WebLogic Server:: the server does not support version 3.0 of the J2EE Web module specification
When I try Weblogic 11g 10.3 When the 5 server runs the application, it displays "the server does not support version …… -
Java – how do I get numbers? How many items have different names?
I have a list < custom > Where is custom class Custom { public int id; public String name; } How do I ge…… -
Java – unit test for parsing files. How to load files from within the application?
I want to test a service method for parsing Excel files >I want to create a test folder for Excel files under web a…… -
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…… -
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…… -
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…… -
The CTRL space completion of Java – Eclipse: main is no longer valid
I use eclipse (3.7.1), and I like Ctrl space autocompletion It was once used to generate static public void main (stri…… -
MVC in Java only needs to point in the right direction
I'm not a rookie in programming I have written in one language or another for 20 years Just not in Java My main langua…… -
Java – how to get “real” exceptions in JUnit instead of ejbexceptions when using ejbcontainer?
I am setting up unit tests in my Java EE application I am using JPA, JSF, NetBeans and GlassFish It is also my first r…… -
Java – executorservice restart
Can I restart executorservice to start accepting new tasks after shutdown? Or must I always create a new executorservi…… -
Java – how does atomicinteger work?
I don't think threading is such a difficult sigh if(++threadcounter==3){doSomething(); threadcounter =0;} I find this …… -
How do I listen to changes in vertex selection in Jung 2?
How do I listen to changes in vertex selection in Jung 2? I've been trying to use propertychangelister and changeliste……