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Best practices/performance: mixing StringBuilder.append with String.concat
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Effective Java 2-nd edition: Using the string concatenation operator repeatedly to concatenate n strings requires time quadratic in n. So is it still relevant?
– gkiko
Mar 17 '15 at 8:49
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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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How to lazy load images in ListView in Android
...anguage governing permissions and limitations
under the License.
*/
import java.io.IOException;
public class DrawableManager {
private final Map<String, Drawable> drawableMap;
public DrawableManager() {
drawableMap = new HashMap<String, Drawable>();
}
public Dr...
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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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 ...
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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Null check in an enhanced for loop
What is the best way to guard against null in a for loop in Java?
11 Answers
11
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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...
Returning from a finally block in Java
...o find that it's possible to have a return statement in a finally block in Java.
6 Answers
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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...