Read the qualified line of CSV file and write it to another CSV

// Read csv File and write another csv in 
    public static void  readAndWrite(String readFile, String writeFile){
        File csv = new File(writeFile); //  In which file 
        try {
            BufferedReader reader = new BufferedReader(new FileReader(readFile));// Which file to read from 
            reader.readLine();// The first line of information , For the title information , no need , if necessary , Comment out 
            String line = null;
            // Line by line reading 
            while((line=reader.readLine())!=null){
                String item[] = line.split(",");//CSV The format file is a comma separator file , It's divided by commas 
                //System.out.println(item);
                double q= Double.parseDouble(item[1]);
                // Here are the screening criteria 
                if((q >= 41275.0) && (q <= 41275.98)){// The number here represents time, i.e 2013/1/1 0：00        2013/1/1 24：00
                    String last = item[item.length-1];// This is the data you want 
                    double w= Double.parseDouble(last);//int value = Integer.parseInt(last);// If it's an integer 
                    BufferedWriter bw = new BufferedWriter(new FileWriter(csv,true)); //  Additional write 
                    bw.write(String.valueOf(w));
                    bw.newLine();// Line break 
                    bw.close();
                    System.out.println(w);}
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }