try catch语句出错了

Question

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();
} }}

Answer 1

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

Answer 2

oos的作用域只是在try{}当中，所以在finally就解析不了import java.io.*;
import java.util.*;public class ProductManager {
    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{
            try{
                oos.close();
            }catch(IOException e){
                e.printStackTrace();
            }        }    }}