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Timer & TimerTask versus Thread + sleep in Java
...
From the Timer documentation:
Java 5.0 introduced the java.util.concurrent package and one of the
concurrency utilities therein is the ScheduledThreadPoolExecutor which
is a thread pool for repeatedly executing tasks at a given rate or
delay. It is ...
How do I fix "The expression of type List needs unchecked conversion…'?
In the Java snippet:
9 Answers
9
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What does -XX:MaxPermSize do?
...lly generate and load many classes; for example,
some implementations of JavaServer Pages (JSP) pages. These
applications may need a larger permanent generation to hold the
additional classes. If so, the maximum permanent generation size can
be increased with the command-line option -XX:MaxP...
How to add an image to a JPanel?
...e's how I do it (with a little more info on how to load an image):
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
import javax.swing.JPanel...
What are markers in Java Logging frameworks and what is a reason to use them?
...tps%3a%2f%2fstackoverflow.com%2fquestions%2f16813032%2fwhat-are-markers-in-java-logging-frameworks-and-what-is-a-reason-to-use-them%23new-answer', 'question_page');
}
);
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How to update a value, given a key in a hashmap?
Suppose we have a HashMap<String, Integer> in Java.
17 Answers
17
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Develop Android app using C#
...Mono and dot42 are licensed products.
Personally, I would recommend using Java with the IntelliJ IDEA dev environment. I say this for 3 reasons:
There is so much Java code out there for Android already; do yourself a favour and don't re-invent the wheel.
IDEA is similar enough to Visual Studio as...
JRuby on Rails vs. Ruby on Rails, what's difference?
...s Ruby is a C implementation.
Key features to note are:
JRuby runs on Java VM's and it's either compiled or interpreted down to Java byte code.
JRuby can integrate with Java code. If you have Java class libraries (.jar's), you can reference and use them from within Ruby code with JRuby. In the ...
Sort objects in ArrayList by date?
...
Since Java 8 the List interface provides the sort method. Combined with lambda expression the easiest solution would be
// sort DateTime typed list
list.sort((d1,d2) -> d1.compareTo(d2));
// or an object which has an DateTime a...
Last iteration of enhanced for loop in java
...: ints) {
sb.append(delim).append(i);
delim = ",";
}
Update: For Java 8, you now have Collectors
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