Question

我正在处理一个请求文件名的作业，然后将文件输出到带有编号行格式的.txt文件中，如：

[001]

[002]

我将代码拼凑在一起以使程序正常工作，但我似乎无法以请求的格式编写代码。任何帮助将不胜感激。

到目前为止，这是我的代码。

    try {

        System.out.println("Enter your source code file name: ");
        Scanner scanner = new Scanner(System.in);
        String file = scanner.nextLine();

        in = new FileInputStream(file);
        out = new FileOutputStream(file + ".txt");

        int c;
        while ((c = in.read()) != -1) {
            out.write(c);
        }

    } catch (IOException e) {
        System.out.println("Error!");

    }

Answer 1

您只需要一个计数器来计算行数：

BufferedReader in = new BufferedReader(new FileReader(fileName));
BufferedWriter out = new BufferedWriter(new FileWriter(fileName + '.txt');
String line;
while ((line = in.read()) != -1) {
     counter++;
     out.write(String.format(..., counter, line)+"\r\n");
}

有关String.format()方法的其他信息，请查看此link

Answer 2

尝试使用BufferedReader / BufferedWriter来更轻松地读取和写入文本行：

function onCancellationAgentsReceived(series) {
        $("#agentcancellations").empty();
        $.plot("#agentcancellations", series, {
            bars: { show: true, barWidth: 0.7, align: "center" }, xaxis: {mode: "categories", tickLength: 0, position: "bottom"}});
    }

Java输出编号的行格式

2 个答案: