文件逐行读取逐行写入
BufferedReader in = new BufferedReader(new FileReader("in.txt"));
PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter("out.txt")));
String s;
while((s=in.readLine())!=null){
out.println(s);
}
in.close();
out.close();
BufferedReader in = new BufferedReader(new FileReader("in.txt"));
PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter("out.txt")));
String s;
while((s=in.readLine())!=null){
out.println(s);
}
in.close();
out.close();