How to modify this code to return Geopoint - class

Question

I would like this code to return a newly constructed geopoint.
I need this,
GeoPoint prjTest=new GeoPoint(vxi+x,vyi+y);
to stick somewhere and return prjTest. I'm new to programming and I don't know well synthax.I tried many things, I can keep guessing for a long time. Please help. Thanks.
public class ProjectileTest
{
public ProjectileTest(float vi, float angle) /** renamed velocity -> vi */
{
//Starting location
double xi = 0, yi = 100;
final double gravity = -9.81;
//timeSlice declares the interval before checking the new location.
double timeSlice = 0.001; /** renamed time -> timeSlice */
double totalTime = 0; /** renamed recordedTime -> totalTime */
double vxi = vi * Math.cos(Math.toRadians(angle)); /** renamed xSpeed -> vxi */
double vyi = vi * Math.sin(Math.toRadians(angle)); /** renamed ySpeed -> vyi */
//This (secondsTillImpact) seems to give a very accurate time whenever the angle is positive.
double secondsTillImpact = Math.sqrt(2 * yi / -(gravity));
/** Not sure I agree. Does this formula take into account the upward motion
* of the projectile along its parabolic arc? My suspicion is that this
* formula only "works" when the initial theta is: 180 <= angle <= 360.
*
* Compare with the result predicted by quadratic(). Discarding the zero
* intercept which can't work for us (i.e. the negative one, because time
* only moves forward) leaves us with an expected result very close to the
* observed result.
*/
double y;
double x;/** Current position along the y-axis */
do {
// x = x + (xSpeed * time);
x = vxi * totalTime; /** Current position along the x-axis */
// y = y + (ySpeed * time);
y = yi + vyi * totalTime + .5 * gravity * (totalTime * totalTime);
// ySpeed = ySpeed + (gravity * time);
double vy = vyi + gravity * totalTime; /** Current velocity of vector y-component */
System.out.println("X: " + round2(x) + " Y: " + round2(y) + " YSpeed: " + round2(vy));
totalTime += timeSlice;
}
while (y > 0);
////////////////////////////++++++++ GeoPoint prjTest=new GeoPoint(vxi+x,vyi+y);
System.out.println("Incorrectly expected seconds: " + secondsTillImpact + "\nResult seconds: " + totalTime);
quadratic((.5 * gravity), vyi, yi);
}
public double round2(double n) {
return (int) (n * 100.0 + 0.5) / 100.0;
}
public void quadratic(double a, double b, double c) {
if (b * b - 4 * a * c < 0) {
System.out.println("No roots in R.");
} else {
double dRoot = Math.sqrt(b * b - 4 * a * c); /** root the discriminant */
double x1 = (-b + dRoot) / (2 * a); /** x-intercept 1 */
double x2 = (-b - dRoot) / (2 * a); /** x-intercept 2 */
System.out.println("x-int one: " + x1 + " x-int two: " + x2);
}
}
}