References

Self-Test Questions

1.	What is the purpose of an exception?
2.	What class serves as the root of all Errors and Exceptions?
3.	What’s the difference between a checked and an unchecked exception?
4.	(True/False) You must explicitly handle an unchecked exception.
5.	What’s the purpose of a try/catch statement?
6.	How many catch clauses can a try/catch statement contain?
7.	What’s the purpose of the finally clause?
8.	(True/False) Both the catch and finally clauses can be simultaneously omitted from a try/catch/finally statement.
9.	What’s the purpose of a throws clause?
10.	In what order should you catch exceptions?

Answers

1.	- to signal the occurrence of an error condition
2.	- java.lang.Throwable
3.	- you do not have to explicitly handle unchecked exceptions, although it is sometimes a good idea to do so
4.	- false
5.	- statements that may throw a checked exception must be enclose inside a try block. The catch block is used to catch and handle the exception when thrown.
6.	- as many as required
7.	- The finally clause contains statements that will be executed when an exception occurs. Usually contains cleanup code.
8.	- false
9.	- The throws clause is used to indicate that a method will throw a particular type of exception.
10.	- From specific to general