I have a class where one of its members is ArrayList<ArrayList<Double>> elements, and so I have a constructor that takes in that same type and all is good.
public elementArray(ArrayList<ArrayList<Double>> elements)
{
this.elements = elements;
// a bunch of other stuff happens
}
However, I also need to be able to construct with an input of type Double[][], so I first convert it to the 2D list type, and then call the original constructor...
public elementArray(Double[][] array)
{
// convert Double[][] array to ArrayList<ArrayList<Double>> elements
this(elements);
}
Only, I can't call another constructor except as the first thing that happens in my constructor! Am I doomed to copy-paste here, or is there a clever way to do what I want?
One solution would be to extract the conversion into a static method:
public elementArray(Double[][] array) {
this(convert(elements));
}
private static ArrayList<ArrayList<Double>> convert(Double[][] array) {
// convert Double[][] array to ArrayList<ArrayList<Double>> elements
}