Case Study: Immutable Finite Functions, Part 1
In this case study, we design and implement an immutable abstract data type of finite functions.
The IMap<K,V> interface extends
the Map<K,V> interface
defined in Java's java.util package.
That is possible only because all operations of
the Map<K,V> interface
that have side effects are optional:
classes that implement those optional operations
are allowed to implement them by defining methods
that throw an UnsupportedOperationException
if those methods are ever called.
Our first implementation of the IMap<K,V>
interface relies on inheritance by extending two
abstract base classes defined in Java's java.util package:
AbstractMap<K,V> and
AbstractSet<K,V>.
© Mitchell Wand, 2012-2015
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
The work has been modified by William D Clinger in these ways and more: conversion from PowerPoint to HTML, and from Racket to Java.