document.write('
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  1. public class Book {
  2.  
  3.     private String author;
  4.     private String title;
  5.     private String refNumber;
  6.     private int pages;
  7.    
  8.     public Book(String bookAuthor, String bookTitle, String bookRefNumber, int bookPages) {
  9.         author = bookAuthor;
  10.         title = bookTitle;
  11.         pages = bookPages;
  12.         refNumber = "";
  13.     }
  14.    
  15.     public String getAuthor() {
  16.         return author;
  17.     }
  18.     public String getTitle() {
  19.         return title;
  20.     }
  21.    
  22.     public int getPages() {
  23.         return pages;
  24.     }
  25.    
  26.     public String getRefNumber() {
  27.         return refNumber;
  28.     }
  29.    
  30.     public void setRefNumber(String refNumber) {
  31.         String errMsg = "Reference Number harus diatas 3 karakter";
  32.        
  33.         if(refNumber.length()<3) {
  34.             System.out.println(errMsg);
  35.         }
  36.         else {
  37.             this.refNumber = refNumber;
  38.         }
  39.        
  40.            
  41.     }
  42.    
  43.     public void printAuthor() {
  44.         System.out.println(author);
  45.     }
  46.    
  47.     public void printTitle() {
  48.         System.out.println(title);
  49.     }
  50.    
  51.     public void printDetails() {
  52.         String refNumPrint = refNumber;
  53.        
  54.         System.out.println("Title: " + title + ", Author: " + author + ", Pages: " + pages);
  55.        
  56.         if(refNumPrint.length() < 0) {
  57.             refNumPrint = "ZZZ";
  58.         }
  59.         System.out.println("Reference number:  " + refNumPrint);
  60.     }
  61. }
');