Class Shape

java.lang.Object

Shape

All Implemented Interfaces:

java.lang.Comparable<Shape>

Direct Known Subclasses:

Circle, Rectangle, Triangle

public abstract class Shape
extends java.lang.Object
implements java.lang.Comparable<Shape>

Content originated from Kushagra Tiwary, 10/30/2016 Modified by garethhalladay on 9/12/17 An abstract class may contain one or more abstract methods and may also contain non-abstract methods. Abstract methods are methods that are declared but not implemented, and therefore must be overridden by the class that extends this class. They are declared using the keyword 'abstract'. An equivalent interface to this abstract class would be as follows: public interface Shape { public int area(); public int perimeter(); } The Comparable interface supports sorting according the criteria defined by the class. The Comparable interface requires only one method called compareTo that compares objects.

Constructor Summary

Constructors

Constructor	Description
Shape()

Method Summary

Modifier and Type	Method	Description
abstract double	calculateArea()	Abstract method that returns the area of polygon.
abstract double	calculatePerimeter()	Abstract method that returns the perimeter of polygon.
int	compareTo(Shape shape)	compareTo method required for implementing the Comparable interface Return: -1 from compareTo if the area of this Shape is less than the area of the Shape parameter 0 from compareTo if the area of this Shape equals the area of the Shape parameter 1 from compareTo if the area of this Shape is greater than the area of the Shape parameter

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Shape

public Shape()

Method Detail

calculateArea

public abstract double calculateArea()

Abstract method that returns the area of polygon.

Returns:

the area of a polygon

calculatePerimeter

public abstract double calculatePerimeter()

Abstract method that returns the perimeter of polygon.

Returns:

the perimeter of a polygon

compareTo

public int compareTo(Shape shape)

compareTo method required for implementing the Comparable interface Return:

• -1 from compareTo if the area of this Shape is less than the area of the Shape parameter
• 0 from compareTo if the area of this Shape equals the area of the Shape parameter
• 1 from compareTo if the area of this Shape is greater than the area of the Shape parameter

Specified by:

compareTo in interface java.lang.Comparable<Shape>

Parameters:

shape -

Returns: