``` finishBtn.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent ae) { boolean append; try { PrintWriter outputStream = null; String day="12"; String s=Integer.toString(Integer.parseInt(receive_pay.getText())); //receive_pay를 s에 저장. FileOutputStream fos=new FileOutputStream(day,true); DataOutputStream dos=new DataOutputStream(fos); dos.writeUTF(s); fos.close(); System.out.println("파일생성"); } catch(Exception e) { } } }); ``` append 할려고하는데 true 값넣어도 안되네요..