Applying the proposed solution to the example. -- ADTmag

Applying the proposed solution to the example.

By Kevlin Henney
July 17, 2000

Patterns in Java
Collections for States
Kevlin Henney
Listing 4. Applying the proposed solution to the example.


public abstract class Workpiece
{
    public abstract void save();
    ...
}

public class Application
{
    public void saveChanges()
    {
        Iterator workpiece = changed.iterator();
        while(workpiece.hasNext())
            ((Workpiece) workpiece.next()).save();
        saved.addAll(changed);
        changed.clear();
    }
    ...
    private Collection saved, changed;
}

About the Author

Kevlin Henney is a Principal Technologist with QA Training in the UK.