Quality Code: Software Testing Principles, Practices, and Patterns

A Simple Example That Makes You Think

Let’s look at an example in Java. Listing 2-1 shows a simple Java class with several clues about its intent in the way it is constructed. Consider the ScoreWatcher class that is part of a system to track sports scores. It encapsulates the function of obtaining the scores from a news feed.

Listing 2-1: A simple Java class to demonstrate intentional construction

Click here to view code image

class ScoreWatcher {  private final NewsFeed feed;  private int pollFrequency; // Seconds  public ScoreWatcher(NewsFeed feed, int pollFrequency) {    this.feed = feed;    this.pollFrequency = pollFrequency;  }  public void setPollFrequency(int pollFrequency) {    this.pollFrequency = pollFrequency;  }  public int getPollFrequency() ...