Scala constructor overload? - W3Cgeek [PDF]

How do you provide overloaded constructors in Scala? Overload constructor for Scala's Case Classes? In Scala 2.8 is ther

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Idea Transcript


class Foo(x: Int, y: Int) { def this(x: Int) = this(x, 0) // default y parameter to 0 }

class Foo(x: Int, y: Int, z: String) { // default y parameter to 0 def this(x: Int, z: String) = this(x, 0, z) // default x & y parameters to 0 // calls previous auxiliary constructor which calls the primary constructor def this(z: String) = this(0, z); }

scala> class Foo(x:Int, y:Int = 0, z:Int=0) { | override def toString() = { "Foo(" + x + ", " + y + ", " + z + ")" } | } defined class Foo scala> new Foo(1, 2, 3) res0: Foo = Foo(1, 2, 3) scala> new Foo(4) res1: Foo = Foo(4, 0, 0)

abstract class Expectation[T] extends BooleanStatement { val expected: Seq[T] … } object Expectation { def apply[T](expd: T ): Expectation[T] = new Expectation[T] {val expected = List(expd)} def apply[T](expd: Seq[T]): Expectation[T] = new Expectation[T] {val expected = expd } def main(args: Array[String]): Unit = { val expectTrueness = Expectation(true) … } }

class A(x: Int, y: Int) { def this(x: Int) = this(x, x) def this() = this(1) override def toString() = "x=" + x + " y=" + y class B(a: Int, b: Int, c: String) { def this(str: String) = this(x, y, str) override def toString() = "x=" + x + " y=" + y + " a=" + a + " b=" + b + " c=" + c } }

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