public static Class unboxType(Class wrapperType){
  Class c=(Class)wrapperMap.get(wrapperType);
  if (c != null)   return c;
  throw new InterpreterError("Not a primitive wrapper type: " + wrapperType);
}

public static Class unboxType ( Class wrapperType ) { Class c = ( Class ) wrapperMap . get ( wrapperType ) ; if ( c != null ) return c ; throw new InterpreterError ( "Not a primitive wrapper type: " + wrapperType ) ; }
get the corresponding primitive type class for the java . lang wrapper class type . e . g . integer . class - > integer . type
