java - 尝试使用 Java 中的 printf() 格式化发票

Question

我正在尝试使用 Java 中的 printf() 格式化发票。我希望最终结果应该是这样的。

_______________________________________
               Invoice 1
              24-Oct-2017
---------------------------------------
| ID |          DESC        |   AMT   |
---------------------------------------
| 1 | Item1                 |   15,000|
---------------------------------------
| 2 | Item2                 |  200,000|
---------------------------------------
| 3 | Enterprise Javaaaaaaa |         |
|   | a                     |  300,000|
---------------------------------------
|      Sub Total               515,000|
---------------------------------------
|      Tax(5%)                  25,750|
---------------------------------------
|      Total                   540,750|
---------------------------------------
             THANK YOU!
_______________________________________

不知何故，我达到了预期的结果，但是当项目的描述长度超过单元格的空间时，它会将边框推到右侧，而不是换行。

    _______________________________________
                   Invoice 1
                  24-Oct-2017
    ---------------------------------------
    | ID |          DESC        |   AMT   |
    ---------------------------------------
    | 1 | Item1                 |   15,000|
    ---------------------------------------
    | 2 | Item2                 |  200,000|
    ---------------------------------------
    | 3 | Enterprise Javaaaaaaaaa |  300,000|
    ---------------------------------------
    |      Sub Total               515,000|
    ---------------------------------------
    |      Tax(5%)                  25,750|
    ---------------------------------------
    |      Total                   540,750|
    ---------------------------------------
                 THANK YOU!
    _______________________________________

这是这些行的格式字符串。

public void printTitles(){
    Date todayDate = new Date();
    System.out.printf("_______________________________________");
    System.out.printf("\n\t\t\tInvoice 1");
    System.out.printf("\n\t\t\t\t%td-%<tb-%<tY", todayDate);
}

public void printHeaders(){
    System.out.printf("\n---------------------------------------");
    System.out.printf("\n| ID |\t\t\tDESC\t\t|\tAMT\t  |");
    System.out.printf("\n---------------------------------------");
}

public void printRows(String id, String desc, int fee) {
    System.out.printf("\n| %s | %.20s| %,8d|", id, desc, fee);
    System.out.printf("\n---------------------------------------");
}

public void printResult() {
    System.out.printf("\n|\t   Sub Total\t\t      %,8d|",subTotal);
    System.out.printf("\n---------------------------------------");
    System.out.printf("\n|\t   Tax(5%%)\t\t\t\t  %,8d|", tax);
    System.out.printf("\n---------------------------------------");
    System.out.printf("\n|\t   Total\t\t\t\t   %,4d|", total);
    System.out.printf("\n---------------------------------------");
    System.out.printf("\n\t\t\t\tTHANK YOU!");
    System.out.printf("\n_______________________________________");
}

如何让描述自动变得比包含单元格的宽度长？

Answer 1

public static void printRows(String id, String desc, int fee) {
    System.out.printf("\n| %s | %-20.20s| %,8d|", id, desc, fee);
    while(desc.length()>20){
        desc=desc.substring(20);
        System.out.printf("\n|   | %-20.20s|         |", desc);
    }
    System.out.printf("\n---------------------------------------");
}

(我必须承认，-20部分来自Matt的回答)