Creating a parser of Class name + String value to a typed value

I am trying to write a method that can take in a String classname and a String value, and return the value represented as that String.

Example inputs:

parse("java.lang.String", "abc") -> String "ABC"
parse("java.lang.Boolean", "FALSE") -> Boolean FALSE
parse("java.lang.Integer", "123") -> Integer 123
parse("com.me.Color", "RED") -> enum Color.RED

I have found that if I use an if block containing assignableFrom calls, I can achieve this. But would prefer writing something more extendable, so it isn't as difficult to add a new parser tomorrow.

This is what I have now:

    String stringClassName = //stringified full class name
    String value = //value to parse
    Class<?> fieldType = Class.forName(stringClassName)
    if (fieldType.isAssignableFrom(String.class)) {
      return value;
    } else if (fieldType.isAssignableFrom(Boolean.class)) {
      return Util.toBoolean(value);
    } else if (fieldType.isEnum()) {
      return Util.toEnum(fieldType, value);
    } else {
      // throw exception
    }