Error Exception handling with try catch block

Exceptions represent programmer-level bugs like trying to access an array element that doesn’t exist.

Errors are user-level issues like trying load a file that doesn’t exist. Because errors are expected during the normal execution of a program.

Example:

NSArray *inventory = @[@"Sam",
                       @"John",
                       @"Sanju"];
int selectedIndex = 3;
@try {
    NSString * name = inventory[selectedIndex];
    NSLog(@"The selected Name is: %@", name);
} @catch(NSException *theException) {
    NSLog(@"An exception occurred: %@", theException.name);
    NSLog(@"Here are some details: %@", theException.reason);
} @finally {
    NSLog(@"Executing finally block");
}

OUTPUT:

An exception occurred: NSRangeException

Here are some details: *** -[__NSArrayI objectAtIndex:]: index 3 beyond bounds [0 .. 2]

Executing finally block

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