1. Generic array list and casting C&K s7.7
Intro to Java Week 9
Generic array list and casting
C&K s7.7

2. A list class String List Fixed size array of Strings
Attributes list (array) total (so far in list)
Methods for add, remove test if OK to add, remove

3. UML class diagram

4. String List method isEmpty
public boolean isEmpty( ){    if (total = = 0) {       return true;    } else {       return false;    } // end if } //end isEmpty

5. Mobile case study - alarm & reminder classes
Alarm has a time (mobile time) and on/off state
Reminder is-a alarm plus a message
Therefore extend alarm to create reminder class

6. Alarm class

7. Reminder class

8. Generic List Object List Like String List List of any objects
Returned object must be cast to correct class aRecentCall = (PhoneCall) recentCallList.getObject( index );

9. ObjectList class

10. Example usage of Object class
ObjectList reminderlist = new ObjectList(size)
for (int index=1; index <= reminderList.getTotal(); index++ ) {    aReminder = (Reminder) reminderList.getObject(index);    System.out.print(aReminder. getAlarmTime().getFormattedTime() );    System.out.println(""+aReminder.getText()); } // end for