First write a Scala class:
Complex.scala
class Complex(real: double, imaginary: double) { def re = real def im = imaginary override def toString() = "" + re + (if (im < 0) "" else "+") + im + "i" }
Compile this using scalac:
> scalac Complex.scala
Now write our Groovy Program:
ComplexMain.groovy
println new Complex(1.2, 3.4)
Now run the program (assuming scala-library.jar is in the CLASSPATH):
> groovy ComplexMain
Which produces:
1.2+3.4i
Note that in this example it would have been just as easy to write our Complex class using Groovy as follows:
class Complex {
def re, im
Complex (double real, double imaginary) {
re = real
im = imaginary
}
String toString() { "$re" + (im<0 ? '' : '+') + im + 'i' }
}
but in other cases you may have some existing Scala classes you wish to reuse from Groovy.
