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Why not abstract fields?
Why can't Java classes have abstract fields like they can have abstract methods?
5 Answers
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Sorting arraylist in alphabetical order (case insensitive)
... return s1.compareToIgnoreCase(s2);
}
});
Or if you are using Java 8:
list.sort(String::compareToIgnoreCase);
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How to generate a random alpha-numeric string?
I've been looking for a simple Java algorithm to generate a pseudo-random alpha-numeric string. In my situation it would be used as a unique session/key identifier that would "likely" be unique over 500K+ generation (my needs don't really require anything much more sophisticated).
...
Android, How can I Convert String to Date?
...
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class MyClass
{
public static void main(String args[])
{
SimpleDateFormat formatter = new SimpleD...
How to add new elements to an array?
...st<String>. It's dynamically growable, unlike arrays (see: Effective Java 2nd Edition, Item 25: Prefer lists to arrays).
import java.util.*;
//....
List<String> list = new ArrayList<String>();
list.add("1");
list.add("2");
list.add("3");
System.out.println(list); // prints "[1, 2...
What are the differences between Clojure, Scheme/Racket and Common Lisp?
...tive features:
Largest library ecosystem, since you can directly use any Java libraries
Vectors [] and maps {} used as standard in addition to the standard lists () - in addition to the general usefullness of vectors and maps some believe this is a innovation which makes generally more readable
Gr...
How do you configure logging in Hibernate 4 to use SLF4J
...ook to https://github.com/jboss-logging/jboss-logging/blob/master/src/main/java/org/jboss/logging/LoggerProviders.java:
static final String LOGGING_PROVIDER_KEY = "org.jboss.logging.provider";
private static LoggerProvider findProvider() {
// Since the impl classes refer to the back-end framew...
My Understanding of HTTP Polling, Long Polling, HTTP Streaming and WebSockets
... support.
Plugin networking: some Android. Not on iOS
HTTP *: mostly yes
Javascript usage complexity (from simplest to most complicated). Admittedly complexity measures are somewhat subjective.
WebSockets
HTTP poll
Plugin networking
HTTP long poll, streaming
Also note that there is a W3C propo...
Finding which process was killed by Linux OOM killer
...killed by oom mechanism
dstat --top-oom
--out-of-memory---
kill score
java 77
java 77
java 77
and as per man page
--top-oom
show process that will be killed by OOM the first
...
HttpServletRequest - how to obtain the referring URL?
I need to log URLs that are linking to my site in a Java Servlet.
4 Answers
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