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OnJava8-Examples/exceptions/TurnOffChecking.java at master · CSapprenticeWT/OnJava8-Examples · GitHub
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exceptions
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TurnOffChecking.java
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// exceptions/TurnOffChecking.java
// (c)2021 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// "Turning off" Checked exceptions
import
java
.
io
.*;
class
WrapCheckedException
{
void
throwRuntimeException
(
int
type
) {
try
{
switch
(
type
) {
case
0
:
throw
new
FileNotFoundException
();
case
1
:
throw
new
IOException
();
case
2
:
throw
new
RuntimeException
(
"Where am I?"
);
default
:
return
;
}
}
catch
(
IOException
|
RuntimeException
e
) {
// Adapt to unchecked:
throw
new
RuntimeException
(
e
);
}
}
}
class
SomeOtherException
extends
Exception
{}
public
class
TurnOffChecking
{
public
static
void
main
(
String
[]
args
) {
WrapCheckedException
wce
=
new
WrapCheckedException
();
// You can call throwRuntimeException() without
// a try block, and let RuntimeExceptions
// leave the method:
wce
.
throwRuntimeException
(
3
);
// Or you can choose to catch exceptions:
for
(
int
i
=
0
;
i
<
4
;
i
++)
try
{
if
(
i
<
3
)
wce
.
throwRuntimeException
(
i
);
else
throw
new
SomeOtherException
();
}
catch
(
SomeOtherException
e
) {
System
.
out
.
println
(
"SomeOtherException: "
+
e
);
}
catch
(
RuntimeException
re
) {
try
{
throw
re
.
getCause
();
}
catch
(
FileNotFoundException
e
) {
System
.
out
.
println
(
"FileNotFoundException: "
+
e
);
}
catch
(
IOException
e
) {
System
.
out
.
println
(
"IOException: "
+
e
);
}
catch
(
Throwable
e
) {
System
.
out
.
println
(
"Throwable: "
+
e
);
}
}
}
}
/* Output:
FileNotFoundException: java.io.FileNotFoundException
IOException: java.io.IOException
Throwable: java.lang.RuntimeException: Where am I?
SomeOtherException: SomeOtherException
*/
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