try catch语句出错了

Java code

public class ProductManager {
    public void save(File f) {
        try {
            ObjectOutputStream oos = new ObjectOutputStream(
                    new FileOutputStream(f));
            Scanner input = new Scanner(System.in);

            System.out.println("Please input prodcutID");
            String id = input.next();
            System.out.println("Please input prodcut name:");
            String name = input.nextLine();
            System.out.println("Please input the price:");
            double price = input.nextDouble();
            System.out.println("Please input the nunmer:");
            int count = input.nextInt();
            Product p = new Product(id, name, count, price);
            oos.writeObject(p);
            

        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();

//下面这句代码中，提示无法解析oos，oos不是就在try里面定义的吗？为什么？
        } finally{
            oos.close();
        }

    }

}

------解决方案--------------------
public void save(File f) {
 ObjectOutputStream oos =null;
try {
oos = new ObjectOutputStream(
new FileOutputStream(f));
Scanner input = new Scanner(System.in);

System.out.println("Please input prodcutID");
String id = input.next();
System.out.println("Please input prodcut name:");
String name = input.nextLine();
System.out.println("Please input the price:");
double price = input.nextDouble();
System.out.println("Please input the nunmer:");
int count = input.nextInt();
Product p = new Product(id, name, count, price);
oos.writeObject(p);


} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();

//下面这句代码中，提示无法解析oos，oos不是就在try里面定义的吗？为什么？
} finally{
oos.close();
}

try里面的局部变量，finally怎么能看到呢？
大括号的范围啊