20.12.31

IO
Input
Output

쓰는 순서 : ObjectInputStream ois = new ObjectInputStream(new InputStreamReader(FileReader(어쩌구)));

FileReader fr = null;
try {
 fr = new FileReader(“books.dat”);
 중간 생략
}catch(IOException e){
 e.printStackTrace();
}finally{
 try{
 fr.close();
 }catch(IOException e){
 e.printStackTrace();
 }
}

try(FileReader fr = new FileReader(“books.dat”)) {
중간 생략
}catch(IOException e){
 e.printStackTrace();
}