How to creat odjects with dynamivc class name

Question

hi i have a problem with class names. i have in my program one father class and a lot of extend classes in the father class. one of this classes is a test class. I want to create an object and the object class must be given dynamic from the keyboard and to be one of the extended classes. how i can do that

Answer 1

It is possible to create an object of a class whose name is known at runtime (as above, the Class.forName() thing) but it's messy and complete overkill for what you are trying to do.
These days when I have to distinguish a limited number of words (e.g. car, van,..) I use an enum. You can use MyEnum.valueOf(String name) to find the enum value from an input string, catch IllegalArgumentException to deal with an unmatched input.
Try something like:
public enum VehicleType {
    car { public Father create() { return new Car(); }},
    plane { public Father create() { return new Plane();} }.
      .. etc.
  public abstract Father create();
try {
    Father vehicle = VehicleType.valueOf(vehicleTypeName.toLowerCase()).create();
  } catch(IllegalArgumentException ex) {
     System.out.println("Unknown type " + vehicleTypeName);
}