(The Fan class ) Design a class named Fan to represent a fan. The class contains: ■ Three constants named SLOW, MEDIUM, and FAST with the values 1, 2, and 3 to denote the fan speed. The Fan class VideoNote M08_LIAN6521_09_SE_C08.qxd 2/2/12 10:21 PM Page 331 332 Chapter 8 Objects and Classes ■ A private int data field named speed that specifies the speed of the fan (the default is SLOW). ■ A private boolean data field named on that specifies whether the fan is on (the default is false ). ■ A private double data field named radius that specifies the radius of the fan (the default is 5). ■ A string data field named color that specifies the color of the fan (the default is blue). ■ The accessor and mutator methods for all four data fields. ■ A no-arg constructor that creates a default fan. ■ A method named toString() that returns a string description for the fan. If the fan is on, the method returns the fan speed, color, and radius in one combined string . If the fan is not on, the method returns the fan color and radius along with the string “fan is off” in one combined string . Draw the UML diagram for the class and then implement the class . Write a test program that creates two Fan objects . Assign maximum speed, radius 10, color yellow, and turn it on to the first object . Assign medium speed, radius 5, color blue, and turn it off to the second object . Display the objects by invoking their toString method .
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