Main package. In order to create a new wizard you need to instanciate class Wizard passing an appropriate step model. Furthermore you will want to attach a listener to the wizard model in order to get notified when the wizard is either canceled or completed:

   //create wizard model
   WizardModel model = new DefaultWizardModel(new Step[]{
       //populate wizard model with custom steps
       new StartStep(),
       new DataInputStep(),
       new FinishStep()
   });
   //add listener to wizard model
   model.addWizardModelListener(...);
   //instanciate wizard
   Wizard wizard = new Wizard(model, "My Wizard");
   //show wizard
   wizard.pack();
   wizard.setVisible(true);

In order to collect user input data throughout the steps, you should use DataModel and DataLookup:

   //create wizard model
   DataModel data = new DataModel();
   WizardModel model = new DefaultWizardModel(new Step[]{
       //populate wizard model with custom steps
       new StartStep(),
       new DataInputStep1(data),
       new DataInputStep2(data),
       new FinishStep()
   });
   //add listener to wizard model
   model.addWizardModelListener(new Evaluator(data));
   ...

   class DataInputStep1 extends AbstractStep {
       protected DataModel data;

       public DataInputStep1(DataModel data) {
           super("Data Input 1", "Put in data here.");
           this.data = data;
       }

       protected JComponent createComponent() {
           JComponent stepComponent = ...;
           //register data input source with data model
           return stepComponent;
       }
       ...
   }

   class Evaluator implements WizardModelListener {
       protected DataModel data;

       public Evaluator(DataModel data) {
           this.data = data;
       }

       public void wizardFinished(WizardModelEvent e) {
           //evaluate user input data and take action here
       }

       public void wizardCanceled(WizardModelEvent e) {}
       public void stepShown(WizardModelEvent e) {}
       public void wizardModelChanged(WizardModelEvent e) {}
   }

Registering a data input source with a data model is fairly easy:

   //input source
   JTextField inputField = new JTextField();
   //obtaining data lookup mechanism
   Method method;
   try {
       method = inputField.getClass().getMethod("getText", null);
   } catch (NoSuchMethodException nsme) {} //does not occur
   DataLookup lookup = new DefaultDataLookup(inputField, method, null);
   //register lookup mechanism with data model
   data.registerDataLookup("myKey", lookup);

Looking up data from registered data input sources is easy as well:

   public void wizardFinished(WizardModelEvent e) {
       Object value = data.getData("myKey");
       //evaluate value and take appropriate action
   }