Lecture 10 - Exceptions

Question 1

Errors vs Exceptions

Answer 1

Errors are system errors, rare and difficult to repair.

Exceptions can/should be solved by programmer.

Question 2

Errors/Checked/Unchecked

Answer 2

• Errors should generally not be caught. Represent irrecoverable situations.
• Unchecked run-time exception should generally be caught, could be declared. Represent unexpected but recoverable situation.
• Checked run-time exception must be declared and must be caught. Represent recoverable situations.

Question 3

Syntax

Answer 3

There can be 0, 1 or more catch clauses since more than one exception type can be thrown or the exception is dealt with elsewhere.

Question 4

Why create own Exception Class?

Answer 4

Being Specific so you can handle exceptions effectively.

Question 5

Finally Clause

Answer 5

Optional, can be useful in cleaning up before the program terminates.