Java Reference
In-Depth Information
... body ...
} catch (final IllegalAccessException ex2) {
... body ...
}
whereby the multi-
catch
clause with two alternatives has been translated into two sep-
arate
catch
clauses, one for each alternative. A Java compiler is neither required nor re-
commended to compile a multi-
catch
clause by duplicating code in this manner, since
it is possible to represent the multi-
catch
clause in a
class
file without duplication.
A
finally
clause ensures that the
finally
block is executed after the
try
block and any
catch
block that might be executed, no matter how control leaves the
try
block or
catch
block.
Handling of the
finally
block is rather complex, so the two cases of a
try
statement with and
A
try
statement is permitted to omit
catch
clauses and a
finally
clause if it is a
try
-with-re-
sources
statement (§
14.20.3
).
14.20.1. Execution of
try
-
catch
A
try
statement without a
finally
block is executed by first executing the
try
block. Then there
is a choice:
• If execution of the
try
block completes normally, then no further action is taken and
the
try
statement completes normally.
• If execution of the
try
block completes abruptly because of a
throw
of a value
V
,
then there is a choice:
♦ If the run-time type of
V
is assignment compatible with (§
5.2
) a catchable ex-
ception class of any
catch
clause of the
try
statement, then the first (leftmost)
such
catch
clause is selected. The value
V
is assigned to the parameter of the se-
lected
catch
clause, and the
Block
of that
catch
clause is executed, and then there
is a choice:
If that block completes normally, then the
try
statement completes nor-
mally.
If that block completes abruptly for any reason, then the
try
statement
completes abruptly for the same reason.
♦ If the run-time type of
V
is not assignment compatible with a catchable excep-
tion class of any
catch
clause of the
try
statement, then the
try
statement com-
pletes abruptly because of a
throw
of the value
V
.
