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Using the Meter class in
Segment 737 as a guide, define a class,
Thermometer, that produces a drawing that looks like a mercury
thermometer with a reading halfway between a given minimum and a given
maximum temperature. Use the fillOval method to draw the bulb.
Use the drawRect and fillRect methods to draw the
rest of the thermometer. All three methods take four arguments: x,
y, width, and height.