Model

• state data for each component
• different data for different models

View

• how the component looks onscreen

Controller

• dictates how the component reacts to events

example

Model:

Minimum=0 Maximum=100 Value=0

View:

Controller:

-accept mouse click on end buttons -accept mouse drag on thumb

• Swing uses the model-delegate design, a similar architecture to MVC.
  
  
• The View and Controller elements are combined into the UI delegate since Java handles most events in the AWT anyway.
• Multiple views can be used with a single model.
• Changes to a single Model can affect different views.
• Components can share a model (JScrollbar and JSlider share the BoundedRangeModel).

   

Most components provide the model-defined API directly in the component class. The component can be manipulated without interacting with the model at all.

//example of method in JSlider class

return getModel().getValue(); }

//so we can use the following and avoid the model

JSlider slider = new JSlider();

int value = slider.getValue();