java - 为什么当我想从文本文件中删除字符串时它不起作用？

Question

我尝试从java中的文本文件中删除字符串，但数据仍然保持不变。

尝试{

        //removing row from table
        mod = (DefaultTableModel) table.getModel();
        int SelectedRowIndex = table.getSelectedRow();
        String day = table.getValueAt(SelectedRowIndex, 0).toString();
        String date = table.getValueAt(SelectedRowIndex, 1).toString();
        String venue = table.getValueAt(SelectedRowIndex, 2).toString();
        String from = table.getValueAt(SelectedRowIndex, 3).toString();
        String to = table.getValueAt(SelectedRowIndex, 4).toString();
        String temp = day + "|" + date + "|" + venue + "|" + from + "|" + to;
        System.out.println(temp);
        mod.removeRow(SelectedRowIndex);

        //scanning data from file and removing data from file based on 
        //selected option in table
        File inputFile = new File("Consultation Hours.txt ");
        File tempFile = new File("Updated Consultation Hours.txt");
        BufferedReader reader = new BufferedReader(new FileReader(inputFile));
        BufferedWriter writer = new BufferedWriter(new FileWriter(tempFile));
        String currentLine;

        while ((currentLine = reader.readLine()) != null) {
            String trimmedLine = currentLine.trim();
            if (trimmedLine.equals(SelectedRowIndex)) {
                continue;
            }
            writer.write(currentLine + System.lineSeparator());

        }

        writer.close();
        reader.close();

        boolean successful = tempFile.renameTo(inputFile);

我一直在寻找不同的方法，但仍然失败，有人知道我哪里出错了吗？

Answer 1

正如其他人所解释的，您正在将选定的行索引与实际文本行进行比较 - 这使得 if 条件始终为 false。您可以为每一行创建一个索引并跳过与所选行索引匹配的行，如下所示。

int index = 0;
while ((currentLine = reader.readLine()) != null) {
    String trimmedLine = currentLine.trim();
    if (index++ == SelectedRowIndex)) {
        continue;
    }
    writer.write(currentLine + System.lineSeparator());
}