Sybex 816 Custom Assessment question 10 with code [tb617624.JaSE11PrgIISG.at.13] possible error

[Olivia Johnson]

1:  import java.io.*;
2:  public class Bird {
3:     private String name;
4:     private transient Integer age;
5:
6:     // Getters/setters omitted
7:
8:     public static void main(String[] args) {
9:        try(var is = new ObjectInputStream(
10:             new BufferedInputStream(
11:             new FileInputStream("birds.dat")))) {
12:          Bird b = is.readObject();
13:          System.out.println(b.age);
14:       } } }

The explanation says

Line 10 includes an unhandled checked IOException, while line 11 includes an unhandled checked FileNotFoundException

but none of BufferedInputStream's constructors declare a checked Exception. I think the author meant to say ?

Line 9 includes an unhandled checked IOException

[Jeanne Boyarsky]

Confirmed and added to the errata crediting you. Thanks!

Note: This is actually question 13. You were probably using the randomizer online for question order. (Which is the default online)

[Viacheslav Yakovenko]

Olivia Johnson wrote:
The explanation says

Line 10 includes an unhandled checked IOException, while line 11 includes an unhandled checked FileNotFoundException

but none of BufferedInputStream's constructors declare a checked Exception.

If you compile code as it is, compiler will complain only about incompatible casting from Object to Bird.

If you fix it adding appropriate cast, compiler will show compile errors on other lines, including line 9 - "exception thrown from implicit call to close() on resource variable 'is'".

Compiler flags unhandled exceptions, thrown by close() method of the variable in try-with-resourses statement, at the point of declaration of such variable.