马伟奇 发表于 2011-12-13 20:59 s=fr.read();这个错了,你上面是读,这里应该是写,应该改成writer
benbenqi 发表于 2011-12-13 21:13 Exception in thread "main" java.lang.NullPointerEx ception at FileReaderDemo.main(FileReaderDemo.jav ...