Computer Science 225
Advanced Programming

Spring 2021, Siena College

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Agenda

• Announcements
  • we're online synchronous today
  • Monday will be online asynchronous - details coming
  • Problem Set 1 graded, open Issues if you had something to be considered for partial credit that hasn't been taken into account
  • Lab 1: Java and Data Structures Refresher (in Canvas and GitHub) will be graded soon
  • Lab 2: Java Interfaces (in Canvas and GitHub) due 24 hours before your next lab
  • Problem Set 2 will be out soon
• Java Interfaces
  • casts and instanceof
  • anonymous classes
• In-class exercises (5 assignment points), answer in a Google document 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?
• Overloaded methods
• Inheritance
  • terminology
  • a simple example
  • protected and default protection

Terminology

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

Examples

• AnimalInterface: custom interface and an anonymous class
• PointOverload: ad-hoc polymorphism
• ColorPoint: simple inheritance example