如何使用Java从正在写入的文件中读取？

import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;

public class ReadWriteFile {
    public static void main(String[] args) {
        File file = new File("example.txt");
        try {
            RandomAccessFile randomAccessFile = new RandomAccessFile(file, "rw");

            // 写入一些数据
            randomAccessFile.writeChars("Hello, World!");

            // 将文件指针移回文件开始
            randomAccessFile.seek(0);

            // 从文件中读取数据
            char ch;
            while ((ch = randomAccessFile.readChar()) != -1) {
                System.out.print(ch);
            }

            randomAccessFile.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}