java - 在java中删除一个文本文件

Question

我有一种方法可以删除包含所选电话号码的文本文件中的一行。下面是我的代码。

private void DeleteButtonActionPerformed(java.awt.event.ActionEvent evt) {                                             

    try {
        String selectedphone = Phone.getText();

        BufferedReader br = new BufferedReader(new FileReader(file));

        // Construct the new file that will later be renamed to the original file
        PrintWriter pw = new PrintWriter(new FileWriter(tempFile));

        String line = null;
        // Read from the original file and write to the new
        // unless content matches data to be removed.
        while ((line = br.readLine()) != null) {
            if (line.trim().startsWith(selectedphone)) {
                continue;
            } else {
                pw.println(line);
                pw.flush();

            }
        }
        pw.close();
        br.close();

        file.delete();
        if (!file.delete()) {
            System.out.println("Could not delete file");
        }

        //rename tempphonebook.txt file back to phonebook.txt
        tempFile.renameTo(file);
        if (tempFile.renameTo(file)) {
            System.out.println("Update succesful");
        } else {
            System.out.println("Update failed");
        }
    } catch (Exception e) {
    }

}

我的'phonebook.txt'文件如下

0787465147|John|Doe|924578654v|Colombo|
0715435786|Jane|Doe|6672475845v|Colombo|
0114745755|Foo|Baz|6454753754v|Kandy|

当我点击带有“selectedphone”作为 0787465147 的“删除”按钮时，它将创建一个“tempphonebook.txt”文件，如下所示。

0715435786|Jane|Doe|6672475845v|Colombo|
0114745755|Foo|Baz|6454753754v|Kandy|

然后应该删除“phonebook.txt”并将“tempphonebook.txt”重命名为“phonebook.txt”。问题是我无法删除“phonebook.txt”文件。当我点击“删除”按钮时，我得到了这个消息

Could not delete file
Update failed

有人可以帮我解决这个问题吗？提前致谢! :)

Answer 1

您尝试删除该文件两次:

    file.delete();
    if (!file.delete()) {

删除第一个 file.delete();