$title

Use BufferedReader and FileReader to read from a file

        // Read from a file
        String fname = "/tmp/x.x";
        try{
            BufferedReader bf = new BufferedReader(new FileReader(fname));
            String s;
            while((s = bf.readLine()) != null){
                Print.p(s);
            }
            bf.close();
        }catch(IOException e){
		     e.printStackTrace();
        }

Use BufferedWriter and FileWriter to write to a file

        // Write to a file
        String fname =  "/tmp/x.x";
        try{
            BufferedWriter bw = new BufferedWriter(new FileWriter(fname));
            bw.write("123\n");
            bw.close();

        }catch(IOException io){
		    e.printStackTrace();
        }