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Activity 11 – Sending simple messages to a Circle object

Run the "SimpleMessages" application. When the application runs it should create a window (show in the diagram below), presenting on the left 4 buttons to press, and on the right an area showing a small, black circle.

Make the circle exhibit the following behavior by sending appropriate messages to it:

1. set its color to red
2. set its color to blue
3. make the circle larger
4. make the circle smaller

Discussion of Activity 11 – Sending simple messages to a Circle object

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