Computer Science 225
Advanced Programming

Spring 2021, Siena College

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Agenda

• Announcements
  • Problem Set 1 due Monday night
    • should have at least the warmup and 2 of the main problems completed by now
    • please continue to create Issues for each problem as you have it ready for testing - don't wait until you have them all done!
    • I will watch through the weekend for Issues asking for test cases to be run, but I will be away from the computer for parts of the weekend
  • Lab 1: Java and Data Structures Refresher (in Canvas and GitHub) due 24 hours before your lab meeting next week
    • some quick reminders related to the data structures mentioned
    • I will continue to add comments periodically for incorrect or incomplete responses, email or tag me in a comment in the document if you want a quicker check
    • submission is just committing and pushing your code, completing the shared document
    • you will see a grade appear in red at the bottom of the document either when you earn the full 100 points or when I make a pass through the remaining submissions after the due date
  • A look at the late penalty policy
    • if you choose to use any Winter Symposium attendance credit for a 24-hour extension, just let me know
• Some Java You Know
• In-class exercises (2.5 assignment points each, total of 10)

  You will submit responses to these by creating a shared Google document named "InClass2" in your CSIS225 folder.

  • Draw a memory diagram for the StaticStuff example when the main method is about to complete execution.
  • Rewrite the switch statement in the code segment below with if and else statements:

            Scanner kbd = new Scanner(System.in);
    
            System.out.print("Enter a number 1-10: ");
            int number = kbd.nextInt();
    
            switch (number) {
                case 1:
                case 4:
                case 6:
                case 8:
                case 9:
                case 10:
                    System.out.println(number + " is composite.");
                    break;
                case 2:
                case 3:
                case 5:
                case 7:
                    System.out.println(number + " is prime.");
                    break;
                default:
                    System.out.println(number + " is out of the allowed range (1-10)");
                    break;
            }
    

  • Rewrite the for loop below as an enhanced for loop, where a is an ArrayList<Integer>:

            for (int i = 0; i < a.size(); i++) {
                int x = a.get(i);
                // do something with x
            }
    

  • Simplify the following using a ternary operator, eliminating the need for the if statement:

            if (numPeople == 1) {
                System.out.println("1 person attended the meeting.");
            }
            else {
                System.out.println(numPeople + " people attended the meeting.");
            }
    

Examples

• StaticStuff: static methods and variables
• BuildingStrings: comparing String concatenation with the StringBuilder class