[java]BufferedReader的问题 新手 求大神给下面一点代码加注释 跪谢！！

Question

package FastReader;
import java.io.*;

/*

• 缓冲读入，优化文件读入效率 */ public class BufferRead { public static String bufferRead(String filename) throws IOException { BufferedReader in = new BufferedReader(new FileReader(filename)); String s; StringBuilder sb = new StringBuilder(); while ((s = in.readLine()) != null) { sb.append(s); sb.append("\n"); } in.close(); return sb.toString(); } }

Answer 1

放到代码库里显示这样看着太累