document.write('
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  1. public void printDetails()
  2. {
  3.     System.out.println("Title:  " + title);
  4.     System.out.println("Author: " + author);
  5.     System.out.println("Pages:  " + pages);
  6.  
  7.     String refNumberString;
  8.     if(refNumber.length() > 0 ) {
  9.         refNumberString = refNumber;
  10.     }
  11.     else {
  12.         refNumberString = "ZZZ";
  13.     }
  14.     System.out.println("Reference number:  " + refNumberString);
  15. }
');