Classes & Forms - The Gizmo Factory

One form that creates new Gizmo's on the bottom of the screen with each button click

	Each Gizmo has several properties: length, width, and height - all integers status - either asleep or awake
	The gizmoFactory form will display a message when a 6th Gizmo object is added
	An about button displays a simple messageBox with who-did-this information
	The following program is raw - no use of static or final when defining any of the members of the class.

//Gizmo.java

public class Gizmo
{
private String manufacturer = "Gizmo Products, Inc.";
private int gizmosInService = 0;
private int length;
private int width;
private int depth;
public Gizmo (int len, int wid, int dep)
{
gizmosInService = gizmosInService + 1;
length = len;
width = wid;
depth = dep;
       
}
public int getInServiceCount ()
{
return gizmosInService;
}

public String getManufacturer ()
{
return manufacturer;
}

    public int awake = 0;
    public int asleep = 1;
    private int status = asleep;

    public void setStatus (int stat)
    {
        status = stat;
    }

    public int getStatus ()
    {
        return status;
    }
}

// GizmoFactory.java

import com.ms.wfc.app.*;
import com.ms.wfc.core.*;
import com.ms.wfc.ui.*;

/**
* This class can take a variable number of parameters on the command
* line. Program execution begins with the main() method. The class
* constructor is not invoked unless an object of type 'GizmoFactory'
* created in the main() method.
*/
public class GizmoFactory extends Form
{
private void aboutGizmosBtn_click(Object source, Event e)
{
MessageBox.show("Gizmos are proudly manufactured by "+
gizmo1.getManufacturer());
}

private Gizmo gizmo1;
private Gizmo gizmo2;
private Gizmo gizmo3;
private Gizmo gizmo4;
private Gizmo gizmo5;

   
private void makeAGizmoBtn_click(Object source, Event e)
{
int gizmoStatus = 0;
if (gizmo1 == null)
{
gizmo1 = new Gizmo(1,2,3);
gizmoIcon1Pic.setVisible(true);
           
}
else if (gizmo2 == null)
{
gizmo2 = new Gizmo(2,9,7);
gizmoIcon2Pic.setVisible(true);
           
}
else if (gizmo3 == null)
{
gizmo3 = new Gizmo(5,6,1);
gizmoIcon3Pic.setVisible(true);
           
}
else if (gizmo4 == null)
{
gizmo4 = new Gizmo(1,7,4);
gizmoIcon4Pic.setVisible(true);
           
}
else if (gizmo5 == null)
{
gizmo5 = new Gizmo(8,1,7);
gizmoIcon5Pic.setVisible(true);
           
}
else
{
MessageBox.show("Your Gizmo Pen is full! No more Gizmos can be created!",
"No Room",
MessageBox.ICONEXCLAMATION+MessageBox.OK);   
}
gizmoInfoLbl.setText("There are currently "+
gizmo1.getInServiceCount()+
" gizmos in service");
}

    public GizmoFactory()
    {
        // Required for Visual J++ Form Designer support
        initForm();        

        // TODO: Add any constructor code after initForm call
    }

    /**
    * The main entry point for the application.
    *
    * @param args Array of parameters passed to the application
    * via the command line.
    */
    public static void main(String args[])
    {
        Application.run(new GizmoFactory());
    }

Upon examination, try to figure out where to modify the code so that -- gizmosInService will accurately reflect the total number of Gizmo objects being used the Gizmo constructor can be used to initialize status the form can display the status in a text box underneath each displayed Gizmo ... and is expressed with the corresponding word asleep or awake manufacturer becomes a shared constant (a class or static member of the Gizmo class)

The solution is downloadable by clicking here (I hope!)

Last Updated by DrB on 18 February 2009