// strings/ReceiptBuilder.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
import java.util.*;

public class ReceiptBuilder {
 private double total = 0;
 private Formatter f =
 new Formatter(new StringBuilder());
 public ReceiptBuilder() {
 f.format(
 "%-15s %5s %10s%n", "Item", "Qty", "Price");
 f.format(
 "%-15s %5s %10s%n", "----", "---", "-----");
 }
 public void add(String name, int qty, double price) {
 f.format("%-15.15s %5d %10.2f%n", name, qty, price);
 total += price * qty;
 }
 public String build() {
 f.format("%-15s %5s %10.2f%n", "Tax", "",
 total * 0.06);
 f.format("%-15s %5s %10s%n", "", "", "-----");
 f.format("%-15s %5s %10.2f%n", "Total", "",
 total * 1.06);
 return f.toString();
 }
 public static void main(String[] args) {
 ReceiptBuilder receiptBuilder =
 new ReceiptBuilder();
 receiptBuilder.add("Jack's Magic Beans", 4, 4.25);
 receiptBuilder.add("Princess Peas", 3, 5.1);
 receiptBuilder.add(
 "Three Bears Porridge", 1, 14.29);
 System.out.println(receiptBuilder.build());
 }
}
/* Output:
Item Qty Price
---- --- -----
Jack's Magic Be 4 4.25
Princess Peas 3 5.10
Three Bears Por 1 14.29
Tax 2.80
 -----
Total 49.39
*/