Instances

The following is a display of the contents of some of the previously created instances:

 ________________________________________________________________
|
|       > (send drill :show)
|       Object is #<Object: #2ddbc>, Class is #<Object: #277a6>
|         POWER = AC
|         MOVEABLE = T
|         OPERATION = HOLES
|       #<Object: #2ddbc>
|
|       > (send hand-saw :show)
|       Object is #<Object: #2dc40>, Class is #<Object: #277a6>
|         POWER = NONE
|         MOVEABLE = T
|         OPERATION = CUTS
|       #<Object: #2dc40>
|________________________________________________________________

From the display of these instances you can see there are some components and values. The components of an instance are:

Class Pointer

This pointer shows to which class the current object instance belongs. It is through this link that the system finds the methods to execute for the received messages.

Instance Variables and Values

The Instance Variables (IVAR) component lists what variables exist within the instance. The Instance Values component holds what the current values of the variables are. Instance Variables are used to hold state information for each instance. There will be a group of Instance Variables for each instance.