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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...
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...
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 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 to get IP address of the device from code?
...his is my helper util to read IP and MAC addresses. Implementation is pure-java, but I have a comment block in getMACAddress() which could read the value from the special Linux(Android) file. I've run this code only on few devices and Emulator but let me know here if you find weird results.
// Andr...
About Python's built in sort() method
...t file for a textual explanation, results, etc etc.
If you prefer reading Java code than C code, you could look at Joshua Bloch's implementation of timsort in and for Java (Joshua's also the guy who implemented, in 1997, the modified mergesort that's still used in Java, and one can hope that Java w...
How to check if a String contains only ASCII?
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You can do it with java.nio.charset.Charset.
import java.nio.charset.Charset;
public class StringUtils {
public static boolean isPureAscii(String v) {
return Charset.forName("US-ASCII").newEncoder().canEncode(v);
// or "ISO-8859-1"...
Getting java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory exception
i am executing simple Dependency Injection program of spring & getting this exception.
I have already included common-logging1.1.1.jar and spring.jar file. Could you please help to out?
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