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Why are you not able to declare a class as static in Java?
...). - As others have noted (Iain Elder in a comment to another answer), the language designers could have allowed the static keyword on a top-level class to denote and enforce that it may only contain static members, and not be instantiated; that could, however, have confused people as static has a d...
Splitting String with delimiter
... way in groovy. you have to use tokenize...
See the docs:
http://groovy-lang.org/gdk.html#split()
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How to read environment variables in Scala
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Same way:
scala> System.getenv("HOME")
res0: java.lang.String = /Users/dhg
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Why is an array not assignable to Iterable?
... Arrays do implement methods: they implement all the methods of java.lang.Object.
– mhsmith
Aug 2 '17 at 12:34
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When should null values of Boolean be used?
...grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/6-b14/java/lang/Boolean.java
A null Boolean reference should only be used to trigger similar logic to which you have any other null reference. Using it for three state logic is clumsy.
EDIT: notice, that Boolean a = true; is a mislead...
How to get Scala List from Java List?
...omment by @Yaroslav)
Since Scala 2.8 this conversion is now built into the language using:
import scala.collection.JavaConversions._
...
lst.toList.foreach{ node => .... }
works. asScala did not work
In 2.12.x use import scala.collection.JavaConverters._
In 2.13.x use import scala.jdk.Collec...
Convert Java Array to Iterable
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just my 2 cents:
final int a[] = {1,2,3};
java.lang.Iterable<Integer> aIterable=new Iterable<Integer>() {
public Iterator<Integer> iterator() {
return new Iterator<Integer>() {
private int pos=0;
public boolean ...
How to quit scala 2.11.0 REPL?
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You can also use java.lang.System.exit(0);
– Elliott Frisch
Apr 27 '14 at 2:45
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Is there a way to simulate the C++ 'friend' concept in Java?
...age. Private, protected, and packaged security is enforced as part of the language design.
James Gosling wanted Java to be C++ without the mistakes. I believe he felt that friend was a mistake because it violates OOP principles. Packages provide a reasonable way to organize components without be...
Prevent ViewPager from destroying off-screen views
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This method throws : "java.lang.IllegalStateException: Fragment already added:" error for my app.
– alicanbatur
Feb 18 '14 at 14:11
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