XPlorations
| Refactoring Demo Screencast: Extract Method |
May, 2006 |
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Four ways to Extract Method. |
Refactoring is "improving the design of existing code". We want to do this
quickly and safely, so that we're improving the code's design but not
introducing bugs while we change it.
This series of videos shows four different ways of performing the refactoring
"Extract Method":
- Sloppy (Flash, 0.9M)
- Manual, but "by the book" (Flash, 1.1M)
- Automated, using the IDE's refactoring support
(Flash, 0.9M)
- Automated, at full speed (Flash, 0.5M)
The code we're improving is part of a program that lets a user unscramble
sentence fragments. The part in bold below shows the code we're going to extract.
public class Board extends JPanel implements PropertyChangeListener {
// ...
public String toString() {
Component[] cards = this.getComponents();
List sortedResult = Arrays.asList(cards);
Collections.sort(sortedResult, new BoardComparator());
StringBuffer result = new StringBuffer();
for (int i = 0; i < sortedResult.size(); i++)
result.append(sortedResult.get(i).toString());
return result.toString();
}
}
[Recorded May, 2006. Tools: Eclipse, Macromedia Captivate,
Audacity.]
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