Question

Basically, say if I have two double values as such:

 import javax.swing.JSpinner;
 import javax.swing.SpinnerNumberModel;


public class UI  {
    public static void main(String args[]){
        JSpinner stonesSpinnerImperial;
        JSpinner poundsSpinnerImperial;

        stonesSpinnerImperial = new JSpinner();
        poundsSpinnerImperial = new JSpinner();

        stonesSpinnerImperial.setModel(new SpinnerNumberModel(3, 3, 31, 1));
        poundsSpinnerImperial.setModel(new SpinnerNumberModel(0.0, 0.0, 13.0, 1.0));

        double imperial_stones = (double) stonesSpinnerImperial.getModel().getValue();
        double imperial_pounds = (double) poundsSpinnerImperial.getModel().getValue();
        double total_imperial_weight =  imperial_stones + imperial_pounds;

    }
}

However I get the following error:
java.lang.Integer cannot be cast to java.lang.Double

I feel my logic behind this is flawed and any assistance in this matter would be greatly appreciated.

EDIT: I’ve added as much as I feel is required.

Answer 1

Use the SpinnerNumberModel that accepts double values; it uses Double internally. For example,

new SpinnerNumberModel(3d, 3d, 31d, 1d)

Addendum: Based on your updated code, consider casting to Number,

    double imperial_stones =
        ((Number)stonesSpinnerImperial.getModel().getValue()).doubleValue();
    double imperial_pounds =
        ((Number)poundsSpinnerImperial.getModel().getValue()).doubleValue();