java - 从文本文件中的一行中删除单词

Question

我正在尝试删除时间表行中的单词 alle 30 Min。目前正在删除 30 和 Min，但不删除单词 alle。我该如何解决？

感谢任何帮助。

示例

apple 05:05 05:35 06:05 06:35 07:05 07:35 08:05 17:05 17:35 18:05 18:35 19:05 19:35
chairalle 05:08 05:38 06:09 06:39 07:09 07:39 08:09 17:09 17:39 18:09 18:39 19:09 19:39
tablealle 05:09 05:39 06:11 06:41 07:11 07:41 08:11 alle 17:11 17:41 18:11 18:41 19:11 19:41
spoonalle 05:11 05:41 06:14 06:44 07:14 30 07:44 08:14  17:14 17:44 18:14 18:44 19:14 19:44
cabelalle 05:13 05:43 06:17 06:47 07:17 07:47 08:17 17:17 17:47 Min 18:17 18:47 19:17 19:47

Excepted output without alle 30 Min:

apple 05:05 05:35 06:05 06:35 07:05 07:35 08:05 17:05 17:35 18:05 18:35 19:05 19:35
chairalle 05:08 05:38 06:09 06:39 07:09 07:39 08:09 17:09 17:39 18:09 18:39 19:09 19:39
tablealle 05:09 05:39 06:11 06:41 07:11 07:41 08:11 17:11 17:41 18:11 18:41 19:11 19:41
spoonalle 05:11 05:41 06:14 06:44 07:14 07:44 08:14  17:14 17:44 18:14 18:44 19:14 19:44
cabelalle 05:13 05:43 06:17 06:47 07:17 07:47 08:17 17:17 17:47 18:17 18:47 19:17 19:47

代码:

    Scanner scannerLines = new Scanner(file)) {

    while (scannerLines.hasNextLine()) {
        String line = scannerLines.nextLine();
        if (line.contains(" alle ")) {
            //Delete alle from the line.
            line.replace(" alle ", " ");
            String nextLine = scannerLines.nextLine();
            Pattern pattern = Pattern.compile("\\s\\d\\d\\s");

            Matcher m = pattern.matcher(nextLine);
            while (m.find()) {
                value = Integer.parseInt(m.group().trim());
                line.replace(m.group(), " ");

                String nextLine2 = scannerLines.nextLine();
                nextLine2.replace("Min", " ");
                System.out.println(value);
            }
        }
        writer.println(line);
    }

Answer 1

将结果字符串赋值回行!

line = line.replace(" alle ", " ");

引用String#replace

工作示例:

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;

public class TestReplace {

    public static void main (String [] args) {

        File inputFile = new File("Input.txt");
        File outputFile = new File("Output.txt");

        Scanner sc = null;
        FileWriter fw = null;

        try {       
            sc = new Scanner(inputFile);
            fw = new FileWriter(outputFile);

            while(sc.hasNextLine()) {
                String str = sc.nextLine();                 
                str = str.replaceAll("\\s30\\s|\\salle\\s|\\sMin\\s", " ");                 
                fw.write(str + "\r\n");
            }

            sc.close();
            fw.close();

        } catch (FileNotFoundException e2) {
            e2.printStackTrace();
        } catch (IOException e1) {
            e1.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

输出:

apple 05:05 05:35 06:05 06:35 07:05 07:35 08:05 17:05 17:35 18:05 18:35 19:05 19:35
chairalle 05:08 05:38 06:09 06:39 07:09 07:39 08:09 17:09 17:39 18:09 18:39 19:09 19:39
tablealle 05:09 05:39 06:11 06:41 07:11 07:41 08:11 17:11 17:41 18:11 18:41 19:11 19:41
spoonalle 05:11 05:41 06:14 06:44 07:14 07:44 08:14  17:14 17:44 18:14 18:44 19:14 19:44
cabelalle 05:13 05:43 06:17 06:47 07:17 07:47 08:17 17:17 17:47 18:17 18:47 19:17 19:47