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How to run a background task in a servlet based web application?
I'm using Java and I want to keep a servlet continuously running in my application, but I'm not getting how to do it. My servlet has a method which gives counts of the user from a database on a daily basis as well as the total count of the users from the whole database. So I want to keep the servlet...
What are the differences between a HashMap and a Hashtable in Java?
What are the differences between a HashMap and a Hashtable in Java?
35 Answers
35
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From Arraylist to Array
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JavaDocs are your friend. If the array being passed in is too small a new array is returned. The other version of the method that takes no args returns an array of Object
– Brian Roach
N...
Java enum - why use toString instead of name
...ectly changes the toString() return, then it was already broken.
From the javadoc (emphasis mine) :
Returns a string representation of the object. In general, the
toString method returns a string that "textually represents" this
object. The result should be a concise but informative represe...
Java switch statement multiple cases
Just trying to figure out how to use many multiple cases for a Java switch statement. Here's an example of what I'm trying to do:
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Who is calling the Java Thread interrupt() method if I'm not?
I've read and re-read Java Concurrency in Practice, I've read several threads here on the subject, I've read the IBM article Dealing with InterruptedException and yet there's something I'm simply not grasping which I think can be broken down into two questions:
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Importing a GitHub project into Eclipse
...ource code is imported but the created project created by Eclipse is not a java project.
Again normal.
When selecting the option "Use the new projects wizard" and creating a new java project using the wizard should'nt the code be automatically imported ?
No, that would only create an empty ...
Wrapping null-returning method in Java with Option in Scala?
... know whether it will return you a string or a null, because it comes from Java.
4 Answers
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How to make pipes work with Runtime.exec()?
...ocess".
At least with "ls" you have a language-independent (albeit slower) Java replacement. Eg.:
File f = new File("C:\\");
String[] files = f.listFiles(new File("/home/tihamer"));
for (String file : files) {
if (file.matches(.*some.*)) { System.out.println(file); }
}
With "ps", it's a bit ...
How do I fix a NoSuchMethodError?
I'm getting a NoSuchMethodError error when running my Java program. What's wrong and how do I fix it?
28 Answers
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