CS231 (Sp03) Review Topics for Final

1. String manipulation. E.g. see your encryption lab
   1. declaring, creating, comparing strings.
   2. Sample exercises: count the number of times the letter 'a' appears in a String; checking to see how many letters vs non-letters a String contains; converting all occurances of a characters c to a character d.
2. 1D Arrays
   1. declaring, e.g. int nums[];
   2. creating, e.g. nums = new int[10];
   3. loading with primitive types, e.g. for (int i=0;i<nums.length;i++) nums[i]=100;
   4. loading with objects
   5. Sample exercises: loading an integer array with random numbers, summing these numbers and computing an average. Searching an array of strings to find a match.
3. 2D Arrays
   1. declaring, e.g. int nums[][];
   2. creating, e.g. nums = new int[10][20];
   3. loading with integers
   4. Sample exercises: Create a 10x10 2D array of integers and set all of the array elements to 100.
4. Using Vectors
   1. declaring and creating, e.g. Vector stuff = new Vector();
   2. loading with objects: stuff.addElement(new Account());
   3. retrieving objects: Account a = (Account) stuff.elementAt(i);
5. Recursion
   1. What is a recursive method?
   2. Given a recursive method, can you say what it does? E.g. what does the following do?

      public void start() { doStuff(20); }
      
      public void doStuff(int n) {
      	if (n<0) return;
      	else {
      		System.out.println(n);
      		doStuff(n-1);
      	}
      }

6. Database manipulation: Know how to
   1. Create a simple Account class with name and balance (include accessors, constructors, toString methods).
   2. Create an AccountList Class using an array.
   3. Be able to
      • add items to the list
      • delete items from the list
      • see if the list contains an account with a given name
      • print out the list (i.e. a toString method)
   4. Check for correctness of user input
      • E.g. make sure the user doesn't enter a deposit that is negative or withdraw an amount greater than what they have in their account.
      • Catch error when the user enters a non-numeric value into a TextField that is supposed to take an integer.

        try { 
        	int withdraw = Integer.parseInt(withDrawTextField.getText());
        } catch (Exception e) {
        	outTextArea.append("Error in withdraw amount. Please try again.");
        	return;
        }

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