///////    Str.java    ///////

class Str
{  private native String myAppend(String a);

   static { System.loadLibrary("app"); }

   private String str1 = "abc";

   public static void main(String[] args)
   {    Str obj = new Str();
        String value = obj.myAppend("XYZ");
        System.out.println(obj.str1);
        System.out.println(value);
   }
}