Computer Science 15-100 (Sections T & U), Fall 2007
Class Notes:   Object-Oriented Design (2 of 2)

Logistics

1. Reading:  L&L Sections Chapter 6 (today: 6.7 through 6.9)

1. Iterator and Iterable Interfaces (from last lecture)
    
2. Enumerated Types Not Revisited (Skip 6.6)
    
3. Method Decomposition == Top-Down Design
    
4. Method Parameters
   1. Passed "by value"
      1. Primitives are copies
      2. Objects are references
          
   2. Variable-Length Parameters
      public static int averageWithVarArgs(int... vals) {
          int sum = 0;
          for (int i=0; i<vals.length; i++)
              sum += vals[i];
          return sum / vals.length;
      }
      
      public static int averageWithEnhancedForLoop(int... vals) {
          int sum = 0;
          for (int val : vals) sum += val;
          return sum / vals.length;
      }   
      
      public static void main(String[] args) {
          System.out.println(averageWithVarArgs(1,2,3,4,5));  // prints 3
          System.out.println(averageWithEnhancedForLoop(1,2,3,4,5));  // prints 3
      }
       
5. Method Overloading
   1. Allowed:  Same name, different signature
   2. Not allowed:  same signature, different return type
   3. eg:  Math.abs
   4. eg:  System.out.println
   5. not an example:  toString()  <-- handled via inheritance (coming soon!)
       
6. Testing
   1. Importance of...
   2. Code reviews / walkthroughs
   3. Unit testing, test suite, test cases, boundary case analysis, black-box vs white-box./glass-box testing, statement coverage, JUnit

Carpe diem!