package  com.forward.test;

 import  java.lang.reflect.*;

 public   class  TypeCastProcessor {
     public   static   void  main(String args[]){
        
         if  (args.length <  2 ) {
            System.out.println("Use TypeCastProcessor class_name value");
            System.out.println("For example TypeCastProcessor java.lang.Integer 34");
            System.out.println("The class_name must be a class, wich have constructor with one String argument");
            System.exit( 0 );
        }
        
        String class_name = args[ 0 ];
        String dig = args[ 1 ];
        
        System.out.println("Casting '" + dig + "' for '" + class_name + "'");
        
         try {
             Class  clazz =  Class .forName(class_name);
            Constructor constructors[] =  clazz.getConstructors();
            
            Constructor myconstr =  null ;
             for  ( int  i =  0 ; i < constructors.length; i++){
                 Class  types[] = constructors[i].getParameterTypes();
                 if  (types.length ==  1  && types[ 0 ].getName().equals("java.lang.String")){
                    myconstr = constructors[i];
                     break ;
                }
            }
            
             if  (myconstr ==  null ) {
                 throw   new  Exception("Unable to find constructor with one String parameter");
            }
                         
            Object arg_list[] =  new  Object[] {dig};
            Object myobj = myconstr.newInstance(arg_list);
            
            // in myobj we have our casted object now
            
            System.out.println(myobj.getClass().getName() + " = " + myobj);
            
        }  catch  (Exception e){
            e.printStackTrace();
        }
    }
}