import java.io.*;
class test{
    public static void main(String[] args){
        //使用緩衝流實現檔案的複製
        BufferedReader br = null;
        BufferedWriter bw = null;

        try{
            br = new BufferedReader(new FileReader("temp.txt"));
            bw = new BufferedWriter(new FileWriter("temp_copy.txt"
 
));

            String line = null;
            while((line = br.readLine())!=null){
                bw.write(line);
                bw.newLine();//寫入換行
                bw.flush();
            }
        }catch(IOException e){
            e.printStackTrace();
        }
        finally{
            try
 
{
                if(br!=null){
                    br.close();
                }
            }catch(IOException e){
                    e.printStackTrace();
                }
        }
        try{
            if(bw!=null){
                bw.close();
            }
        }catch(IOException e){
            e.printStackTrace();
        }
    }
}