Recursion Diagram for                  Sequence of Activations, 
List Example                           Terminations and Outputs
                                      
        printList(5)
             |                         Activate printList(5)
             | System.out.println(5)   Activate printList(4)
             |                         Activate printList(3)
        printList(4)                   Activate printList(2)
             |                         Activate printList(1)
             | System.out.println(4)   Activate printList(0)
             |                         n > 0 is false, so no output.
        printList(3)                   Terminate printList(0)
             |                         n > 0 so output n == 1 
             | System.out.println(3)   Terminate printList(1)
             |                         n > 0 so output n == 2 
        printList(2)                   Terminate printList(2)
             |                         n > 0 so output n == 3 
             | System.out.println(2)   Terminate printList(3)
             |                         n > 0 so output n == 4 
        printList(1)                   Terminate printList(4)
             |                         n > 0 so output n == 5 
             | System.out.println(1)   Terminate printList(5)
             |
        printList(0)