Design a class named Fan to represent a fan. The class contains Class Fan Object

Question

Design a class named Fan to represent a fan. The class contains
Class Fan

Object
extended by Fan

public class Fan
extends Object

Field Summary
static int FAST

static int MEDIUM

static int SLOW


Constructor Summary
Fan()
Constructor sets default values: radius = 5.0 color = "blue" speed = SLOW on = false
Fan(double radius, String color, int speed, boolean on)
Constructor with parameters for all data fields

Method Summary
String getColor()
Get the color of the fan
double getRadius()
Get the radius of the fan
int getSpeed()
Get the speed of the fan
boolean isOn()
Check whether fan is on
void setColor(String color)
Change the color of the fan
void setOn(boolean on)
Set whether fan is on / off
void setRadius(double radius)
Change value of the radius
void setSpeed(int speed)
Change the fan speed
String toString()
Returns string that describes the Fan (one type of string if the fan is on - another if it is off)

Methods inherited from class Object
equals, getClass, hashCode, notify, notifyAll, wait, wait, wait


Field Detail
FAST

public static final int FAST

See Also:
Constant Field Values

MEDIUM

public static final int MEDIUM

See Also:
Constant Field Values

SLOW

public static final int SLOW

See Also:
Constant Field Values

Constructor Detail
Fan

public Fan()

Constructor sets default values: radius = 5.0 color = "blue" speed = SLOW on = false

Fan

public Fan(double radius,
String color,
int speed,
boolean on)

Constructor with parameters for all data fields

Parameters:
radius -
color -
speed -
on - true / false
Throws:
IllegalArgumentException - if radius is <= 0
IllegalArgumentException - if speed is not one of the defined values

Method Detail
getColor

public String getColor()

Get the color of the fan

Returns:
the color

getRadius

public double getRadius()

Get the radius of the fan

Returns:
the radius

getSpeed

public int getSpeed()

Get the speed of the fan

Returns:
the speed

isOn

public boolean isOn()

Check whether fan is on

Returns:
true of fan is on ; false otherwise

setColor

public void setColor(String color)

Change the color of the fan

Parameters:
color - the color to set

setOn

public void setOn(boolean on)

Set whether fan is on / off

Parameters:
on - true to turn on fan; false for off

setRadius

public void setRadius(double radius)

Change value of the radius

Parameters:
radius - the radius to set
Throws:
IllegalArgumentException - if radius is <= 0

setSpeed

public void setSpeed(int speed)

Change the fan speed

Parameters:
speed - the speed to set
Throws:
IllegalArgumentException - if speed is not one of the defined values

toString

public String toString()

Returns string that describes the Fan (one type of string if the fan is on - another if it is off)

Overrides:
toString in class Object

Explanation / Answer

import java.awt.*; import javax.swing.*; import java.awt.event.*; public class DrawArcs extends JFrame { public DrawArcs() { Timer timer = new Timer(1000, new TimerListener()); timer.start(); setTitle("Show Arcs"); getContentPane().add(new ArcsPanel()); } private class TimerListener implements ActionListener { public void actionPerformed(ActionEvent e) { repaint(); } } public static void main (String [] args) { DrawArcs frame = new DrawArcs(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(250, 300); frame.setLocationRelativeTo(null); frame.setVisible(true); } class ArcsPanel extends JPanel { public void paintComponent(Graphics g) { super.paintComponent(g); int xCenter = getWidth() / 2; int yCenter = getHeight() / 2; int radius = (int)(Math.min(getWidth(), getHeight()) * 0.4); int x = xCenter - radius; int y = yCenter - radius; int sLength = (int)(radius * 0.8); g.setColor(Color.blue); g.fillArc(x, y, 2 * radius, 2 * radius, 0, 45); g.setColor(Color.blue); g.fillArc(x, y, 2 * radius, 2 * radius, 90, 45); g.setColor(Color.blue); g.fillArc(x, y, 2 * radius, 2 * radius, 180, 45); g.setColor(Color.blue); g.fillArc(x, y, 2 * radius, 2 * radius, 270, 45); } } }

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