替换txt文件中的特定行

Question

我正在从文本文件中读取预订系统的座位数据，并将其写入ArrayList中。一个行将被放入一个可变的fileline中。文件行是从每个“，”中拆分出来的，并放入名为Components的数组中。然后将组件放入对象中。

txt文件示例

1a, first, window, notable, forward, noeoa, false, null 
1b, first, nowindow, notable, forward, noeoa, false, null
2a, first, window, notable, forward, eoa, false, null
2b, first, nowindow, notable, forward, eoa, false, null
3a, first, window, table, forward, noeoa, false, null
3b, first, nowindow, table, forward, noeoa, false, null

然后进入一个if语句，检查座位是否合适，如果合适，我想将false更改为true，并将乘客名添加为null，但只在合适的座位上。我想知道是否有任何方法可以覆盖文本文件中的特定行。行号存储在一个名为lineCounter的变量中

Scanner inFile = new Scanner(
            new FileReader("seats.txt"));
    ArrayList<seat> seats = new ArrayList<>();
    Boolean var = false;

    while (inFile.hasNext()) {

        String fileLine = inFile.nextLine();

        seats.add(new seat(fileLine));

        if (seat.classs.equals(seatClass) && (seat.window.equals(seatLocation) || seat.both != null)
                && seat.table.equals(seatTable) && seat.face.equals(seatFace) && seat.EOA.equals(seatEOA)
                && seat.resevered == false) {
            System.out.print("Seat " + seat.seat + " Booked");
            var = true;
            seat.resevered = true;
            seat.resName = emailSelect;


        }

其中文件线被拆分

public seat(String fileLine)
{

String[] components = fileLine.split(",");

if (components[7].equals("null"))
    this.resName = null;
else
    this.resName = components[7];

if (components[2].equals(" both"))
    this.both = "notnull";
else
    this.both = null;

this.seat = (components[0].trim());
this.classs = (components[1].trim());
this.window = (components[2].trim());
this.table = (components[3].trim());
this.face = (components[4].trim());
this.EOA = (components[5].trim());
this.resevered = Boolean.parseBoolean(components[6].trim());

}

Answer 1

假设您想要覆盖文件中的数据，请查看下面的代码，我在修改了您的代码后编写了这些代码

Scanner inFile = new Scanner(
        new FileReader("seats.txt"));
ArrayList<seat> seats = new ArrayList<>();
Boolean var = false;
int count=0;
while (inFile.hasNext()) {

    String fileLine = inFile.nextLine();
    count++;

    if(count==lineCounter){
       fileLine=fileLine.replace(oldValue,overWriteValue);
    }
    seats.add(new seat(fileLine));

    if (seat.classs.equals(seatClass) && (seat.window.equals(seatLocation) || seat.both != null)
            && seat.table.equals(seatTable) && seat.face.equals(seatFace) && seat.EOA.equals(seatEOA)
            && seat.resevered == false) {
        System.out.print("Seat " + seat.seat + " Booked");
        var = true;
        seat.resevered = true;
        seat.resName = emailSelect;


    }

解决办法是直截了当的，我希望你找过这个，或者让我知道。