Reading material

• Your First Encounter with Java Exceptions
• Java's Catch or Specify Requirement
• Dealing with Exceptions
  • The ListOfNumbers Example
• Catching and Handling Exceptions
• The try Block
• The catch Block(s)
• The finally Block
• Putting It All Together
• Specifying the Exceptions Thrown by a Method

Additional material

Catching exceptions

try {
    int lo = 1;
    int hi = 1;
    int n = Integer.parseInt(args[0]);
    System.out.println(lo);
    for (int i = 1; i < n; i++) { 
        System.out.println(hi);
        int temp = hi;
        hi = lo + hi;
        lo = temp; 
    }
} catch (ArrayIndexOutOfBoundsException e) {
    System.err.println("No command line argument provided");
} catch (NumberFormatException e) {
    System.err.println("Command line argument " + e.getMessage() + " is not an integer");
} finally {
    System.out.println("Done!");
}

public static int fibonacci(String[] args) throws ArrayIndexOutOfBoundsException, NumberFormatException {
    int lo = 1;
    int hi = 1;
    int n = Integer.parseInt(args[0]); 
    for (int i = 1; i < n; i++) { 
        int temp = hi;
        hi = lo + hi;
        lo = temp; 
    }
    return lo;
}