58 lines
1.7 KiB
Java
58 lines
1.7 KiB
Java
//: exceptions/TurnOffChecking.java
|
|
// ©2015 MindView LLC: see Copyright.txt
|
|
// "Turning off" Checked exceptions.
|
|
import java.io.*;
|
|
import static net.mindview.util.Print.*;
|
|
|
|
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) {
|
|
print("SomeOtherException: " + e);
|
|
} catch(RuntimeException re) {
|
|
try {
|
|
throw re.getCause();
|
|
} catch(FileNotFoundException e) {
|
|
print("FileNotFoundException: " + e);
|
|
} catch(IOException e) {
|
|
print("IOException: " + e);
|
|
} catch(Throwable e) {
|
|
print("Throwable: " + e);
|
|
}
|
|
}
|
|
}
|
|
} /* Output:
|
|
FileNotFoundException: java.io.FileNotFoundException
|
|
IOException: java.io.IOException
|
|
Throwable: java.lang.RuntimeException: Where am I?
|
|
SomeOtherException: SomeOtherException
|
|
*///:~
|