我目前正在为一个大学任务制作一个简单的文本编辑器，通过用户输入，在一个已经存在的文件上，我正在进行基本的操作（切换行位置或单词位置）。
我的程序由一个filemanipulator类（其中包含所有逻辑）和一个gui类（其中main是）

public class FileManipulator {

    File file;//current file
    BufferedReader fileReader; //Reader for the file
    String currentDirectory; //Always verified due to setDirectory() validation

    public FileManipulator() throws IOException{ ...;}

    public void loadFile() throws IOException{
        if(this.fileReader != null) {
            this.fileReader.close();
        }
        this.file = new File(this.currentDirectory);

        //if there isn't a txt file, ask user if he wants to create one
        if(!file.exists()) { //logic for creating a new file}

        //After we are sure a file exists in this directory, we init the fileReader
        this.fileReader = new BufferedReader(new FileReader(this.file));
        this.fileReader.mark(READ_AHEAD_LIMIT);
    }

    public void switchLines(int line1, int line2) throws ArrayIndexOutOfBoundsException, IOException {
        //Logic about switching the lines here

        //Writing to the file
        writeToFile(fileContents);

    }

    //Will open a writer, write to the file and close the writer
    private void writeToFile(ArrayList<String> listToPrint) throws IOException{
        StringBuilder tempList = new StringBuilder();
        for (String s : listToPrint) {
            tempList.append(s);
            tempList.append('\n');
        }

        FileWriter fileWriter = new FileWriter(this.file);
        fileWriter.append(tempList);
        fileWriter.close();
        /* In this function, we make changes to the file, however, when using getFileText()
         * the changes written in the file aren't noticed and the old file is returned
         */
    }

   //Problematic function
   public String getFileText() throws IOException{
        fileReader.reset();
        StringBuilder finalText = new StringBuilder();

        String temp;

        while((temp = fileReader.readLine()) != null) {
            finalText.append(temp);
            finalText.append('\n');
        }

        return finalText.toString();
    }

对文件进行更改并保存后，bufferedreader不会更新。它仍然读取更改前的内容。
当我使用loadfile方法并重新加载同一个文件时，缓冲读取器会被关闭并重新打开，因此文件的内容会被更新，但是每次使用它时打开和关闭缓冲读取器并不是最优雅的解决方案。
我也想过要有一个文件内容的arraylist，并且只在关闭程序时更新它，但是如果我错过了一个简单的修复，那将是一个不必要的练习。