throw new Exception() confusion

[Sekhar Kadiyala]

From the below example, i thought when we encounter the line 'throw new Exception();', it would actually go back to the calling method (main in this case). But why it is getting into catch block?
Then under what circutances would this throw new Exception() will goto the calling method?
Please help. Thanks in advance

 
public class exception {
public static String name="";
public static void findName(int i) {
try {
if (i==1) {
throw new Exception();
}
name=name+"1";
}catch(Exception ex) {
name+="2";
return;
}finally {
name+="3";
}
name+="4";
} //end of methid findName
public static void main(String args[]) {
findName(0);
findName(1);
System.out.println(name);
} //end of main
} //end of class exception

[Sekhar Kadiyala]

Sorry i missed telling you the output. It would be 13423

[Sindhur Sat]

Hi Sekhar,

what circutances would this throw new Exception() will goto the calling method?

If you remove the try,catch and finally blocks and declare the exception(throws Exception)in your method declaration:

  
public static void findName(int i) throws Exception

it will be propogated to the calling method.
Since you are handling it it will not be propagated.
Sindhur.

[Corey McGlone]

Right - when an exception is thrown, it will be caught by the nearest matching catch block. If the exception is thrown within a try block that has a matching catch block and/or finally block, the exception is handled there.
If the exception is thrown within a try block without a matching catch or finally block (or it's a RuntimeException), the exception will be propogated to the method that invoked this one. It will then be handled there or, if that method doesn't handle the exception, it will propogate to the method that invoked that one, and so on.
Of course, if you're not going to handle a given exception within a method that might throw one, you must declare that the method in question is capable of throwing such an exception (by adding "throws Exception" to the end of the method signature). Once you've done that, any methods that invoke this one will be required to handle that exception (or throw it).

[Sekhar Kadiyala]

Thanks guys! I learned one more thing!! Just 5 more days!!! i can't wait to complete the exam!!!