throw execption in try -catch

[varun bihani]

How can we throw user defined exception in try catch block ??

sth like:
try {
System.out.println("Hello " + args[0]);
}
catch (ArrayIndexOutOfBoundsException e) {
throw new Exception (" Error.");
}

Is it possible ?

[mohit bahl]

yes it is possible.

cheers!

[Sanjaya Sugiarto]

Yes, it's ok. But you should understand the effect. You hand-over the exceptions to others and it would be like a snow ball. From the design point-of-view, it's ok if you throw the exception in try-catch block to your own exception class, not to general Exception.

[Burkhard Hassel]

Hi ranchers,

Yes, you can do that. But when you rethrow a checked exception you either have to declare in the method signature that the methods will throw this Exception.
Or you have to catch it back again, looks really ugly:

class Main {
public static void main(String[] args){ // undeclared throw
System.out.println("start");
try {
System.out.println("Hello " + args[0]);
} catch (ArrayIndexOutOfBoundsException e) {
try {
throw new Exception(" Error.");
} catch (Exception e2) {
e.printStackTrace();
}
}
System.out.println("main ready");
}
}

Compiles and prints out
start
main ready
java.lang.ArrayIndexOutOfBoundsException: 0
at Main.main(Main.java:5)




Yours,
Bu.