Throwing exceptions in Java

Question

I have a question about throwing exceptions in Java, a kind of misunderstanding from my side, as it seems, which I would like to clarify for myself.

I have been read

Answer 1

If you're going to manually throw an exception, then obviously you know there has been some error that needs to be handled. Rather than throw the new exception, then catch it, then immediately handle the error, why not just handle the error? You (and the processor) don't need to go through all the work of generating an exception and catching it. The exception also makes the code harder to read and debug.

You would throw an exception, rather than just handling the error immediately, if:

• Other code, like the code that called your method, should handle the error. For example, if your code is not UI code, then it probably shouldn't generate windows. This is your method #2.

• You can take advantage of the try, catch, finally block. It's possible that you could write cleaner code this way, but I think that 90% of the time your code would be more readable using simple if statements.