我想知道BufferedReader是否可以同时使用字符串和整数，我的代码有什么问题？

import java.io.*;

public class Main {
    public static void main(String[] args) {
        int[] nums = {1, 2, 3, 4, 5};
        try {
            var writer = new BufferedWriter(new FileWriter("test.txt"));
            writer.write("hello");
            writer.write("\n welcome");
            for (int num : nums) {
                writer.write(num + "\n");
            }
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

        
        try {
            BufferedReader reader = new BufferedReader(new FileReader("test.txt"));
            String line = reader.readLine();
            int num = Integer.parseInt(reader.readLine());
            while (line != null) {
                System.out.println(line);
                line = reader.readLine();
            }
            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

我想只使用BufferedReader读取在上述方法中写入的int和string