Firstly, you can create a raster catalog and then, for instance, loads all the raster datasets stored in the same workspace into it with the Workspace To Raster Catalog tool. 

Alternatively:


  Use the Mosaic To New Raster tool to merge multiple rasters into a new output raster.


Grouping Multiple Raster Layers
My View-Controller

public class MainForm implements java.util.Observer{
@Override
    public void update(Observable o, Object arg) {
        System.err.println("update View ....");
        this.textField_15.setText(String.valueOf(model.getThermalConductivity()));
            /*
*****
*/


    }
}


In the model I use methods

setChanged();
notifyObservers();


All events model updates are processed in the method "update"

How to divide the controller? 
