in java Design a class named Fan to represent a fan. The class contains: Three c
ID: 3904264 • Letter: I
Question
in java
Design a class named Fan to represent a fan. The class contains:
Three constants named SLOW, MEDIUM, and FAST with values 1, 2, and 3 to denote the fan speed.
An int data field named speed that specifies the speed of the fan (default SLOW).
A boolean data field named on that specifies whether the fan is on (default false).
A double data field named radius that specifies the radius of the fan (default 5).
A string data field named color that specifies the color of the fan (default blue).
A no-arg constructor that creates a default fan.
The accessor and mutator methods for all four data fields.
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 fan color and radius along with the string "fan is off" in one combined string.
Draw the UML diagram for the class. 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.
Explanation / Answer
public class Fan { public static final int SLOW = 1; public static final int MEDIUM = 2; public static final int FAST = 3; private int speed; private boolean on; private double radius; private String color; public Fan() { speed = SLOW; on = false; radius = 5; color = "blue"; } public int getSpeed() { return speed; } public void setSpeed(int speed) { this.speed = speed; } public boolean isOn() { return on; } public void setOn(boolean on) { this.on = on; } public double getRadius() { return radius; } public void setRadius(double radius) { this.radius = radius; } public String getColor() { return color; } public void setColor(String color) { this.color = color; } @Override public String toString() { if(on) { return String.format("Speed: %d, Color: %s, Radius: %f", speed, color, radius); } else { return String.format("Color: %s, Radius: %f and fan is off", color, radius); } } } public class TestFan { public static void main(String[] args) { Fan first = new Fan(); first.setSpeed(10); first.setRadius(10); first.setColor("yellow"); first.setOn(true); Fan second = new Fan(); second.setSpeed(Fan.MEDIUM); second.setRadius(5); second.setColor("blue"); second.setOn(false); System.out.println(first); System.out.println(second); } }
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