Pair

Quick Index

Objectives
Steps
Problem Statement
Hints
Solution
Test Code

Java generics
Pair concepts
Java packages
Writing Test Code

Take a shot at writing the program after viewing the problem statement
When desired, look at the hints
When desired, look at the solution

A pair is a general purpose class that models a "pair" (i.e. a set of two).

One particular case is when you need to return two objects from a method.

Pair is a simple modeling object type:

Pair
	first
	second

The instance variables (ivars) are "first" and "second".

Coding requirements:

Write a class that uses generic type parameters "T" and "S" specified on the class that specifies the value types for ivars "first" and "second", respectively
Write a constructor that receives values to set all ivars
Write a getter for each ivar
Write a setter for each ivar

Hints

You only need two ivars, one constructor, and four instance methods for the Pair class

Solution

Here is code with explanations

Test Code

Testing Problem Statement

Also reference the Association test write-up as needed.

Write code to test the model. If you get stumped, look at test code solution.

Test Code Solution

First, try to write test code yourself. Then review and compare the following for possible ideas.

Here is support code that is needed for the test code.

Note that this support code is just one example of a minimal testing framework. Feel free to build your own.

Object Oriented Programming

Pair

Top Search TOC