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How do I get the file extension of a file in Java?
...ly? It is a great library, full of utilities. Most of them will be part of Java8, like the great Guava Function.
– JeanValjean
Jun 12 '13 at 9:15
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What is the “continue” keyword and how does it work in Java?
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"continue" in Java means go to end of the current loop,
means: if the compiler sees continue in a loop it will go to the next iteration
Example: This is a code to print the odd numbers from 1 to 10
the compiler will ignore the print co...
Common elements in two lists
...reinvent the wheel? Use Commons Collections:
CollectionUtils.intersection(java.util.Collection a, java.util.Collection b)
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Is there an ExecutorService that uses the current thread?
...ou) implementation that only uses the current thread. Stealing this from "Java Concurrency in Practice" (essential reading).
public class CurrentThreadExecutor implements Executor {
public void execute(Runnable r) {
r.run();
}
}
ExecutorService is a more elaborate interface, but ...
What in the world are Spring beans?
...nfiguration instead of having to 'bake in' the scope
of an object at the Java class level. Beans can be defined to be
deployed in one of a number of scopes
*IoC: Inversion of Control
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How to programmatically close a JFrame
...you want Alt-F4 or X to quit the app or just close the active window?
The Java Swing Tutorial on Window Listeners may help clarify things for you.
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How to perform mouseover function in Selenium WebDriver using Java?
...igger hovering using the following code with Selenium 2 Webdriver:
String javaScript = "var evObj = document.createEvent('MouseEvents');" +
"evObj.initMouseEvent(\"mouseover\",true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);" +
"argum...
Is there a fixed sized queue which removes excessive elements?
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There is no existing implementation in the Java Language and Runtime. All Queues extend AbstractQueue, and its doc clearly states that adding an element to a full queue always ends with an exception. It would be best ( and quite simple ) to wrap a Queue into a class o...
How to use Jackson to deserialise an array of objects
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For those working with Agents in Java, Lotus Domino, this is the way to go. I tried some of the other solutions, but always got a ResourceNotFoundException
– John
Mar 8 '17 at 14:38
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How do I use the new computeIfAbsent function?
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Suppose you have the following code:
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
public class Test {
public static void main(String[] s) {
Map<String, Boolean> whoLetDogsOut = new ConcurrentHashMap<>();
whoLetDo...