why checked and unchecked exception?

[dmjpro]

why java provides two flavour exceptions?

why java tells programmer to handle or throw anyway some exceptions and some not?
as jvm can catch it and throw it then why java provided so?

plz explain ....
Regards.

[JosAH]

Some exceptions can't be checked by the compiler; think of NullPointerException
or OperationNotSupportedException. Only during runtime these exceptional
conditions can show up. Maybe the best example is: OutOfMemoryException,
i.e. there is no way a compiler can check that condition and neither can you or
anyone else. That's why it was made an unchecked exception.

The class of the checked exceptions indicate events that in real life can happen
and your program should deal with them: an IOException is a nice example.
That's the reason why it was made a checked exception.

kind regards,

Jos

[dmjpro]

can we catch or should we catch the OutOfMemoryException?

Is this the subclass of Exception?

Plz help.
Regards.

[JosAH]

can we catch or should we catch the OutOfMemoryException?

Is this the subclass of Exception?

Plz help.
Regards.

All bets are off when the JVM is out of memory; of course you can catch that
error but all you can do is release (a substantial amount of) memory by setting
a bunch of references to null. Most of the time when this error is thrown there's
an error in your program logic.

kind regards,

Jos