Question

I was wondering how I could call getJD() within getToD and keep the parameters intact,(or temporarily set the parameters as variables in main and call the variables to the method).
The parameters are going to be input using the scanner class later in the main method.
import static java.lang.Math.*;

public class jdMethods
{
    public static double getJD(double y, double m, double d){
        if (m<=2.0){
            y--;
            m += 12.0;
        }
        double a=floor(y/100.0);
        return (365.25*(y+4716.0))+(30.6001*(m+1))+d+(2.0-a+floor(a/4.0))-1524.5;
    }

    public static double getToD(int h, int m, int s)
    {
        double a = getJD(a, a, a) + ((h-12)/24) + (m/1440) + (s/86400);
        return a;
    }
}

Edited for clarity.

Answer 1

It’s not perfectly clear on what you are trying to do, but I assumed that you just want to save the result of your first getJD() and to use the result within your getToD(), so I made a private _jd and created a setter and getter for it.

import static java.lang.Math.*;

public class jdMethods
{

    private double _jd;
    public double getJD(){
        return _jd;
    }

    public void setJD(double y, double m, double d){
        if (m<=2.0){
            y--;
            m += 12.0;
        }
        double a=floor(y/100.0);
        _jd = (365.25*(y+4716.0))+(30.6001*(m+1))+d+(2.0-a+floor(a/4.0))-1524.5;
    }

    public double getToD(int h, int m, int s)
    {
        double a = getJD() + ((h-12)/24) + (m/1440) + (s/86400);
        return a;
    }
}

So here is how you call it:

jdMethods testRun = new jdMethods();
testRun.setJD(1,2,3);
System.out.println(testRun.getToD(3, 2, 1));