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Checked Exception.

Srinivasa Raghavan
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Joined: Sep 28, 2004
Posts: 1228
When a custom Exception class say "myException" whose super class is
java.lang.Exception is created ,then the compiler considers it as a checked exception. So how can i create a UnChecked Exception ?
Do i need to use this class "RuntimeException".
Super Class of RuntimeException is also "Exception" ? Can any one throw some light on this.


Thanks & regards, Srini
MCP, SCJP-1.4, NCFM (Financial Markets), Oracle 9i - SQL ( 1Z0-007 ), ITIL Certified
John Dell'Oso
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Joined: Apr 08, 2004
Posts: 130
For custom unchecked exceptions you must subclass RuntimeException. For checked exceptions you directly subclass Exception.

Regards,
JD
Srinivasa Raghavan
Ranch Hand

Joined: Sep 28, 2004
Posts: 1228
But the super class of RuntimeException is also "Exception" ??
John Dell'Oso
Ranch Hand

Joined: Apr 08, 2004
Posts: 130
This is a detail that is handled by the JVM.

The rule is you subclass RuntimeException for unchecked exceptions and subclass Exception for checked exceptions.

Generally speaking, it's always best to use checked exceptions - see this:

Runtime Exceptions - The controversy

Regards,
JD
 
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subject: Checked Exception.