# 18 - Exceptions II

Ahmed

# Goals

• define custom exceptions
• use custome exception to control program error flow

# Slides

# Hint: read input from user

Scanner scanner = new Scanner(System.in);
String userInput = scanner.nextLine();

# Exercises

# Exercise 1 - Define simple Exception to check phone number provided by the user . if the length is less than 14 digits and doesnt start with plus.

then trow InvalidPhoneNumberException

• In your main method, use a Scanner to get a user input, and check the above conditions

# Exercise 2 - read Student properties (first name, last name, age , course) from user conole input as above throw customized exceptions in the below cases

• first name lenght is below 3 characters
• last name length is below 3 characters
• age is less than zero

# Excercise 3 - lets create a simple (Rock, Paper, Scissor) .if you dont know the game here are the rule

• Rock beats Scissor
• Scissor beats Paper
• Paper beats Rock so the game asks the user to choose from inputs( R, P, S) and then the computer play a random choice from the three options. and the program should calculate the final result as per above ruls your program should utilize the use exceptions that we learned so far

# Additional Resources

• StackOverflow - Understanding checked vs unchecked exceptions
• StackOverflow - Differences between Exception and Error
• Java Exceptions on Baeldung