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What's the purpose of META-INF?
In Java, you often see a META-INF folder containing some meta files. What is the purpose of this folder and what can I put there?
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Android - Start service on boot
...me=".service" />
</application>
</manifest>
autostart.java
public class autostart extends BroadcastReceiver
{
public void onReceive(Context context, Intent arg1)
{
Intent intent = new Intent(context,service.class);
if (Build.VERSION.SDK_INT >= Build...
How to manually install an artifact in Maven 2?
...and the version for your artifact:
mvn install:install-file \
-DgroupId=javax.transaction \
-DartifactId=jta \
-Dpackaging=jar \
-Dversion=1.0.1B \
-Dfile=jta-1.0.1B.jar \
-DgeneratePom=true
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What is the rationale behind having companion objects in Scala?
...ent possible sets of parameters (compare to what Bloch writes in Effective Java about telescoping constructor)
with the ability to to decide which derived class you want to create instead of the abstract (accompanied) one
Example code:
abstract class AbstractClass;
class RealThing(s: String) exte...
Hadoop “Unable to load native-hadoop library for your platform” warning
... native to your HADOOP_OPTS like this:
export HADOOP_OPTS="$HADOOP_OPTS -Djava.library.path=$HADOOP_HOME/lib/native"
PS: Thank Searene
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Why are `private val` and `private final val` different?
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So, this is just a guess, but it was a perennial annoyance in Java that final static variables with a literal on the right-hand side get inlined into bytecode as constants. That engenders a performance benefit sure, but it causes binary compatibility of the definition to break if the "c...
JVM option -Xss - What does it do exactly?
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Each thread in a Java application has its own stack. The stack is used to hold return addresses, function/method call arguments, etc. So if a thread tends to process large structures via recursive algorithms, it may need a large stack for all...
How do I make HttpURLConnection use a proxy?
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Since java 1.5 you can also pass a java.net.Proxy instance to the openConnection(proxy) method:
//Proxy instance, proxy ip = 10.0.0.1 with port 8080
Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("10.0.0.1", 8080))...
Is there a performance difference between a for loop and a for-each loop?
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From Item 46 in Effective Java by Joshua Bloch :
The for-each loop, introduced in
release 1.5, gets rid of the clutter
and the opportunity for error by
hiding the iterator or index variable
completely. The resulting idiom
applies equally...
Difference between String replace() and replaceAll()
What's the difference between java.lang.String 's replace() and replaceAll() methods,
other than later uses regex? For simple substitutions like, replace . with / ,
is there any difference?
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