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Immutable vs Unmodifiable collection
...le, but certain users aren't permitted to change the collection.
Oracle's Java Collection Wrapper tutorial has this to say (emphasis added):
Unmodifiable wrappers have two main uses, as follows:
To make a collection immutable once it has been built. In this case, it's good practice not ...
How is “mvn clean install” different from “mvn install”?
...nstall.
clean removes the target folder - it deletes all class files, the java docs, the jars, reports and so on. If you don't clean, then maven will only "do what has to be done", like it won't compile classes when the corresponding source files haven't changed (in brief).
we call it target in an...
How to do a batch insert in MySQL
...
A good blog entry on batch inserts (in Java, but it's relevant to any language): viralpatel.net/blogs/batch-insert-in-java-jdbc
– Kangur
Oct 3 '12 at 8:21
...
C# constructor execution order
...more than one if they're chained with Foo() : this(...) etc
Note that in Java, the base class is initialized before variable initializers are run. If you ever port any code, this is an important difference to know about :)
I have a page with more details if you're interested.
...
When do I really need to use atomic instead of bool? [duplicate]
...mment may have originated from an understanding of the keyword volatile in Java. The volatile keyword in Java does control memory fences but has a very different behavior than the volatile keyword in C which does not. This question explains the difference further.
– Pace
...
What exactly is a Maven Snapshot and why do we need it?
...same code. E.g. you might have one with debugging and one without. One for Java 5.0 and one for Java 6. Generally its simpler to have one build which does everything you need. ;)
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How to parse a JSON string to an array using Jackson
...Type()" by "constructCollectionType()" or any other type you need.
import java.io.IOException;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.type.TypeFactory;
public class Sorting {
private Stri...
Difference between Iterator and Listiterator?
...
The differences are listed in the Javadoc for ListIterator
You can
iterate backwards
obtain the iterator at any point.
add a new value at any point.
set a new value at that point.
...
How to set selected value of jquery select2?
...ling my hair out on this one. I don't think it's possible without going to JavaScript solutions. Looking for another jQuery/Bootstrap Select2 dropdown now (2 days of fiddling every conceivable method - no joy!)
– MC9000
Nov 5 '16 at 5:17
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How is pattern matching in Scala implemented at the bytecode level?
...rint your program with all Scala-specific features removed. It's basically Java in Scala's clothing. Here's the relevant scalac -print output for the code snippet you gave:
def eval(e: Expr): Int = {
<synthetic> val temp10: Expr = e;
if (temp10.$isInstanceOf[Number]())
temp10.$asInsta...