Turning off Checked exceptions
//: c09:TurnOffChecking.java
// "Turning off" Checked exceptions.
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
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(Exception 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 f() without a try block, and let
// RuntimeExceptions go out of 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);
}
}
}
} ///:~
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