Computer Science 225
Advanced Programming

Spring 2020, Siena College

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Agenda

• Announcements
  • Lab 1: Java Interfaces due in your labs this week
  • Problem Set 2 repository deadline today, all due Thursday night
• Problem Set 1 recap
  • check your GRADING.md files for accuracy
  • int vs. long, including literals
  • let the stack do the work
  • approaches to the anagrams
  • a tree "cursor"
• Java Interfaces wrapup
  • implementing multiple interfaces
• In-class exercises (5 assignment points)
  • 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?
• Overloaded methods
• Inheritance
  • terminology
  • a simple example
  • protected and default protection

Terminology

• inheritance
• overloading
• ad hoc polymorphism
• subclass/extended class
• superclass/base class
• extends
• derived class
• IS-A association

Examples

• PointOverload
• ColorPoint