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Although I've been using Scala for a while and have mixed it with Java before, I bumped on a problem.
How can I pass a Java array to Scala? I know that the other way around is fairly straightforward. Java to Scala is not so however.
Should I declare my method in Scala?
Here is a small example of what I'm trying to achieve:
Scala:
def sumArray(ar: Array[Int]) = ...
Java:
RandomScalaClassName.sumArray(new int[]{1,2,3});
Is this possible?
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Creating an Array and Accessing Its ElementsScala translates the first line in the example above into a call to Array::apply(), defined in the Array companion object. Such a method takes a variable number of values as input and creates an instance of Array[T], where T is the type of the elements.
Array is a special kind of collection in scala. it is a fixed size data structure that stores elements of the same data type. The index of the first element of an array is zero and the last element is the total number of elements minus one. It is a collection of mutable values.
absolutely!
The Array[T] class in Scala is mapped directly to the Java type T[]. They both have exactly the same representation in bytecode.
At least, this is the case in 2.8. Things were a little different in 2.7, with lots of array boxing involved, but ideally you should be working on 2.8 nowadays.
So yes, it'll work exactly as you've written it.
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