BufferedReader 和BufferedWriter

写个读文件的程序，从一个文件读，写到另外一个文件中。写到另外文件中字符的顺序和第一文件中字符的顺序是颠倒的。
如input.txt中是”好好学习”,输出到output.txt中应该是”习学好好”,开始用字节流, FileInputStream,一直没想到好方法,只能改为BufferedReader和BufferedWriter了package TestTwo; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.FileReader; import java.io.FileWriter; public class FileContentReverse { /** * @param args */ public static void main(String[] args) throws Exception { BufferedReader bufferInput = new BufferedReader(new FileReader("C://input.txt")); BufferedWriter bufferWrite = new BufferedWriter(new FileWriter("C://out.txt")); String readLine = bufferInput.readLine(); StringBuilder sb = new StringBuilder(); while(readLine != null) { sb.append(readLine); readLine = bufferInput.readLine(); } sb = sb.reverse(); bufferWrite.write(sb.toString()); bufferWrite.close(); } }