First, we need to add a bit more functionality to our GameObject class. We do so in GameObject because bullets and asteroids share a surprising amount of similarities with a spaceship.

We need a bunch of getters and setters to get and set the rotation rate, traveling angle, and facing angle. Add the following methods to the GameObject class:

public void setRotationRate(float rotationRate) {
  this.rotationRate = rotationRate;
}

public float getTravellingAngle() {
  return travellingAngle;
}

public void setTravellingAngle(float travellingAngle) {
  this.travellingAngle = travellingAngle;
}

public float getFacingAngle() {
  return facingAngle;
}

public void setFacingAngle(float facingAngle) {
  this.facingAngle = facingAngle;
}

Now, we add a move method, which adjusts the x and y coordinates as well as the facingAngle of the object based on the current frames per second. Add the move method:

void move(float fps){
  if(xVelocity != 0) {
       worldLocation.x...