Parse custom Objects with string input

I want to parse objects where I have an input value. The object has subclasses.

I don't want to create an instance when I want to parse the string. But I want to override the method 'parse'.

class A {
  public A(object param) {
   //code
  }
  public A parse(String input) {
   //code
  }
}

class B extends A {
  public B parse(String input) {
   //code
  }
}

And when I parse the objects I want do it with reflection:

A newObject =  Class.forName(className).getMethod("parse", myParseText);

Is there a nice way to do that.