【ThinkingInJava】26、java字串格式化說明符

標籤：java編程思想

/*** 書本:《Thinking In Java》* 功能:對於java字串格式化說明符* format字串的格式化參數文法如下：* %[argument_index$][flags][width][.precision]conversion* 檔案:Receipt.java* 時間:2015年4月11日19:40:53* 作者:cutter_point*/package Lesson13_strings;import java.util.Formatter;public class Receipt {private double total = 0;private Formatter f = new Formatter(System.out);//指定輸出的目的地public void printTitle()//輸出標題{//這個格式第一個%-15s 是說寬度為15的字串，後面類同，只是-還是不太清楚是個什麼f.format("%-15s %5s %10s\n", "Item", "Qty", "Price");f.format("%-15s %5s %10s\n", "----", "---", "-----");}public void print(String name, int qty, double price){f.format("%-15.15s %5d %10.2f\n", name, qty, price);total += price;}public void printTotal(){f.format("%-15.15s %5s %10.2f\n", "Tax", "", total*0.06);f.format("%-15s %5s %10s\n", "", "", "------");f.format("%-15.15s %5s %10.2f\n", "Total", "", total*1.06);}public static void main(String [] args){Receipt receipt = new Receipt();receipt.printTitle();receipt.print("Jack's Magic Beans", 4, 4.25);    receipt.print("Princess Peas", 3, 5.1);    receipt.print("Three Bears Porridge", 1, 14.29);    receipt.printTotal();    Formatter ff = new Formatter(System.out);    ff.format("%5d", 998);}}

輸出：

Item              Qty      Price
----              ---      -----
Jack‘s Magic Be     4       4.25
Princess Peas       3       5.10
Three Bears Por     1      14.29
Tax                         1.42
                          ------
Total                      25.06
  998

【ThinkingInJava】26、java字串格式化說明符