Question

Here I have

class x{
    ArrayList<Double> values;
    x() {
        values= new ArrayList<Double>();
    }

//here I want to write a method to convert my arraylis(values) in class(x) into an array to be able to use it in my program. Is there any way to do that. thx for your help.

public double [] getarray(){

} 

Answer 1

You shouldn’t really need to turn an ArrayList to an array, but if you do, here’s how.

public double [] getArray(){
    double[] array = new double[values.size()];
    for(int i =0;i<values.size();i++)
    {
        array[i] = values.get(i) != null ?values.get(i):  0.0;
    }
    return array;
}