import java.io.BufferedReader;

 import java.io.BufferedWriter;

 import java.io.FileReader;

 import java.io.FileWriter;

 import java.io.IOException;



 public class IODemo {

public static void main(String[] args) throws IOException {

BufferedReader bufr=null;

BufferedWriter bufw=null;

try {

bufr=new BufferedReader(new FileReader("G:\\dd.txt"));

bufw=new BufferedWriter(new FileWriter("G:\\d.txt"));

String line=null;

while((line=bufr.readLine())!=null){

bufw.write(line);

bufw.newLine();//*****记住换行

bufw.flush();

}

} catch (IOException e) {

// TODO: handle exception

throw new RuntimeException("读写失败");

}finally{

try {

if(bufr!=null){

bufr.close();

}

} catch (IOException e2) {

throw new RuntimeException("读写失败");

}

       


try {

if(bufw!=null){

bufw.close();

}

} catch (IOException e2) {

throw new RuntimeException("读写失败");

}     

}


}

 }