code: public static boolean canConvert(Class from, Class to) {
  	// Identity Conversions
  	if (from == to) return true;
  
  	// Widening Primitive Conversion
  	if (from == byte.class) {
  	    return to == short.class || to == int.class || to == long.class || to == float.class || to == double.class;
  	}
  	if (from == short.class) {
  	    return to == int.class || to == long.class || to == float.class || to == double.class;
  	}
  	if (from == char.class) {
  	    return to == int.class || to == long.class || to == float.class || to == double.class;
  	}
  	if (from == int.class) {
  	    return to == long.class || to == float.class || to == double.class;
  	}
  	if (from == long.class) {
  	    return to == float.class || to == double.class;
  	}
  	if (from == float.class) {
  	    return to == double.class;
  	}
  	return false;
      }
docs: check if given class "from" can be converted to class "to" without explicit casting
  
  @param from source class
  @param to target class
  @return is it possible to convert from "from" to "to"