code: public final class StringUtils
  {
  
      public static final String LIBRARY_NAME = "stringUtils";
  
      static
      {
          System.loadLibrary(LIBRARY_NAME);
      }
  
      private StringUtils()
      {
      }
  
      public static native boolean isAlpha(String string);
  
      public static native boolean isEmpty(String string);
  
      public static void main(String[] args)
      {
          System.out.println(StringUtils.isAlpha("sureIs"));
          System.out.println(StringUtils.isAlpha("nope!"));
          System.out.println(StringUtils.isEmpty("   "));
          System.out.println(StringUtils.isEmpty("nope"));
      }
  
  }
  