當(dāng)我們在BufferedReader沒有明確提供編碼的情況下創(chuàng)建新對象時(shí)，Java 默認(rèn)使用什么編碼/字符集？例如：try (final BufferedReader reader = new BufferedReader(new FileReader("my_file.txt"))) {  reader.readLine(); // What encoding is used to read the file?}