shapes

Class Circle

java.lang.Object

shapes.Shape

shapes.Circle

Direct Known Subclasses:

Cylinder

public class Circle
extends Shape

Constructor Summary

Constructors

Constructor and Description
Circle() Construct a Circle object using the default size for its radius.
Circle(Circle x) This is the copy constructor.
Circle(double theRadius) Construct a Circle object using the argument for the radius.

Method Summary

Modifier and Type	Method and Description
boolean	equals(java.lang.Object o) Returns true if and only if the argument is not null and is a Circle object that has the same radius as this Circle.
double	getPerimeter() Get the perimeter of this Circle, (2*radius*pi).
double	getRadius() Get the radius of this Circle.
double	getSurfaceArea() Get the surface area of this Circle.
void	setRadius(double theRadius) Set the radius of this Circle.
java.lang.String	toString() Returns a String object representing this Circle's value.

Methods inherited from class shapes.Shape

getShapeName

Methods inherited from class java.lang.Object

getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Circle

public Circle()

Construct a Circle object using the default size for its radius.

Circle

public Circle(double theRadius)

Construct a Circle object using the argument for the radius. If r is <= 0, the default size specified in Shape is used for radius instead.

Parameters:

theRadius - the radius of this Circle; must be > 0

Circle

public Circle(Circle x)

This is the copy constructor.

Parameters:

x - is the Circle to be duplicated.

Method Detail

getSurfaceArea

public double getSurfaceArea()

Get the surface area of this Circle. (radius*radius*pi).

Specified by:

getSurfaceArea in class Shape

Returns:

the surface area of this Circle .

getPerimeter

public double getPerimeter()

Get the perimeter of this Circle, (2*radius*pi).

Specified by:

getPerimeter in class Shape

Returns:

the perimeter of this Circle .

getRadius

public double getRadius()

Get the radius of this Circle.

Returns:

the radius of this Circle

setRadius

public void setRadius(double theRadius)

Set the radius of this Circle. If r is <= 0, the radius is unchanged.

Parameters:

theRadius - the new radius of this Circle; must be > 0

toString

public java.lang.String toString()

Returns a String object representing this Circle's value. Overridden from Object.

Overrides:

toString in class java.lang.Object

Returns:

a string representation of this object

equals

public boolean equals(java.lang.Object o)

Returns true if and only if the argument is not null and is a Circle object that has the same radius as this Circle.

Overrides:

equals in class java.lang.Object

Parameters:

o - is the object to be compared with.

Returns:

true if the Circle object argument has the same radius, false otherwise.