從測試文件填充 DefaultTableModel

Question

我有這個文本文件：

A
B
3.00

A
B
3.00

我的觀點是：

我想將每一行與每一列匹配（first_row-first_column、second_row-second_column 等）我在哪里犯了錯誤？ 我的代碼如下：

    BufferedReader infile = new BufferedReader(reader);
        String line = "";
        int counter = 0;
        String title = "";
        String author = "";
        String price = "";
        try {
            while ((line  = infile.readLine()) != null) {
                ++counter;

                if (counter == 1) {
                    title = line;
                } else if (counter == 2) {
                    author = line;
                } else if (counter == 3) {
                    price = line;
                    SimpleBook sb = new SimpleBook(title, author, price);
                    bookList.add(sb);
                    counter = 0;
                }
            }
        } catch (IOException ex) {
            Logger.getLogger(SimpleBookList.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

}

Answer 1

您可以這樣做，因為您的輸入文件中有一個空行。

BufferedReader infile = new BufferedReader(reader);
    String line = "";
    int counter = 0;
    String title = "";
    String author = "";
    String price = "";
    try {
        while ((line  = infile.readLine()) != null) {
            if(line.isEmpty())
                  continue;

            ++counter;

            if (counter == 1) {
                title = line;
            } else if (counter == 2) {
                author = line;
            } else if (counter == 3) {
                price = line;
                SimpleBook sb = new SimpleBook(title, author, price);
                bookList.add(sb);
                counter = 0;
            }
        }
    } catch (IOException ex) {
        Logger.getLogger(SimpleBookList.class.getName()).log(Level.SEVERE, null, ex);
    }

Answer 2

您的計數器在循環開始時遞增，因此您在 if 語句中永遠不會有 0 而是 1。 然后空行被解析為 1 並轉到 A 列。 您可以通過多種方式解決它，例如跳過空行或如果行不為空則增加計數器。