Lecture 4

Lecture 4: More Interfaces; Anonymous Classes
Date: Monday, February 7, 2022

Agenda

Announcements
- Problem Set 1 and Lab 1: Java and Data Structures Refresher (in Canvas and GitHub)rading complete and video recaps of both are now available
- Lab 2: Java Interfaces (in Canvas and GitHub) due 24 hours before your next lab
- Problem Set 2 is now out, see links in Canvas
  - you may work alone or with a partner and all groups must be formed and all repositories must be created (even for those working along) by Wednesday
  - email me if looking for a group and I can match people up
  - video intro in Canvas
  - a quick memory diagram refresher from data structures
  - due in a week
- Check in Canvas for Lab 3 to see if you're the document and repository creator and do those if you are
Java Interfaces
- creating interfaces
- anonymous classes
- casts and instanceof
In-class exercises (5 assignment points), answer in a Google document "LastNameInClass4" in your CSIS225 folder
- Write the Java statement that would implement sorting of our array of Animal objects in the ZooArray example, this time by number of legs from largest to smallest, using a Comparator defined as an anonymous class passed directly as a parameter to the Arrays.sort method.
- What changes would need to be made to the Dog class to implement the Comparable interface, defining the ordering based on a new int-valued field age?

Terminology

Examples