Final answer:
The task involves creating a UML diagram for a Fan class, implementing the class, and writing a test program that demonstrates the creation of Fan objects with specified properties, and displaying the states of these objects using their toString method.
Step-by-step explanation:
Implementing Fan Class with UML Diagram and Test Program
In the context of Computers and Technology, particularly object-oriented programming, the given problem requires creating a UML diagram for a Fan class, implementing it, and writing a test program in a high school computer science module. Let's first define the Fan class with UML diagram notation, considering the specified properties like speed, radius, color, and the state (on or off).
The UML diagram would typically include a class named Fan with three private instance variables: speed (int), radius (double), color (String), and isOn (boolean), along with their respective public getters and setters. Additionally, a toString method would be present to provide a string representation of the fan's state.
In Java, this class can be implemented, setting an enumeration for the speed to handle the values such as maximum, medium, and minimum speeds. Following this, we can create two instances of the Fan class in a test program, setting the first Fan object to maximum speed, radius 10, color yellow, and turning it on, while setting the second Fan object to medium speed, radius 5, color blue, and turning it off. The toString method will be invoked to display their states.
Here is an example of how one might implement the Fan class and its toString method:
public class Fan {
// Declaration of instance variables
...
// Enum for Speed
public enum Speed {MAXIMUM, MEDIUM, MINIMUM}
...
// Constructor
public Fan() {...}
// Getters and Setters
...
// toString method
public String toString() {...}
}
Finally, the test program would demonstrate the creation of the Fan objects and the output upon calling the toString methods.