Why it is not recommended to handle unchecked exceptions by using try...catch blocks? Why we need to avoid them through some conditional checkings only?
Why it is not recommended to handle unchecked exceptions by using try...catch blocks? Why only through some conditional checkings only?
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A fundamental limitation of Java's exception model is that if a method throws an exception it's generally not possible for its caller to know the circumstances surrounding it. If code which is about to compute
x % ytests whetheryis zero, it can know the precise circumstances under which aDivideByZeroExceptionwould have occurred, and handle the situation appropriately. If the condition is instead handled by catching the exception, the programmer may expect that the exception will have resulted from trying to computex % ywhenyis zero, but would also catch divide-by-zero exceptions that occur for unexpected reasons (e.g. calling a method which is supposed to partition a set, but has a bug that causes it to try to subdivide the set into zero pieces). There's no way when catching an exception to specify that one only wants the exception to be caught if it was thrown for the expected reasons. In practice, both checked and unchecked exceptions have this same problem, but it's more common for unchecked exceptions to get thrown in unexpected circumstances.