I hope my pseudo code helps?

if X > 1000 || X < -1000
{ S.O.P "Fail.. X Out of range"
Exit }
else
{ S.O.P "X Validated"}

If you call a constructor, you are already instanciating your object so, it is too late to avoid this fact. You should make a test on X before to decide if you can finally create your object. It can be like this

MovablePoint A = null;
if(X >= -1000 && X =< 1000)
    A = new  MovablePoint(X, Y, xSpeed, ySpeed);

Or if you want use a class constructor, you can create a child class for MovablePoint which will call the mother constructor if the conditions are relevant...

You can also use a static method inner the class MovablePoint to validate the condition

public class MovablePoint
{
  public MovablePoint(int X, int Y, int xsp, int ysp)
  {
     ....
  }

   public static boolean testOfValidation(int X)
   {
      if(X >= -1000 && X =< 1000)
         return true;

     return false;
   }
}

MovablePoint A = null;
if(MovablePoint.testOfValidation(X))
    A = new  MovablePoint(X, Y, xSpeed, ySpeed);



or make a mixed solution

public class MovablePoint
{
  public MovablePoint(int X, int Y, int xsp, int ysp)
  {
     ....
  }

   public static MovablePoint testOfValidation(int X, int Y, int xsp, int ysp)
   {
      if(X >= -1000 && X =< 1000)
         return new MovablePoint( X, Y, xsp, ysp);

      return null;
   }
}

MovablePoint A = MovablePoint.testOfValidation(X, Y, xSpeed, ySpeed);

If you absolutely want to use the constructor, you can call the protected void finalize() method but, the object will be necessary created before to be destroyed and as you can not really decide when an object is effectively destroyed it will remain in memory until the garbage collector does the job.