use the console class for validation and create a main classs Project $3$: Area Calculator

Create an application that calculates the area of various shapes.

Console

Welcome to the Area Calculator

Calculate area of a circle, square, or rectangle? $($c$/$s$/$r$)$: c

CIRCLE:

Enter radius: $3$

Area: $28\mathrm{.}274333882308138$

Continue? $($y$/$n$)$: y

Calculate area of a circle, square, or rectangle? $($c$/$s$/$r$)$: s

SQUARE:

Enter width: $3$

Area: $9\mathrm{.}0$

Continue? $($y$/$n$)$: y

Calculate area of a circle, square, or rectangle? $($c$/$s$/$r$)$: r

RECTANGLE:

Enter width: $3$

Enter height: $4$

Area: $12\mathrm{.}0$

Continue? $($y$/$n$)$: n

Project $4$: Area Calculator $($continued$)$

Specifications

$$ Create an abstract class named Shape that contains:

$$ An abstract method named getArea$()$

$$ A default method that overrides the toString$()$ method and returns a string that includes the value returned by the getArea$()$ method

$$ Create a class named Circle that inherits the Shape class and contains these constructors and methods:

public Circle$($double radius$)$

public double getRadius$()$

public void setRadius$($double radius$)$

public double getArea$()$

$$ Create a class named Square that inherits the Shape class and contains these constructors and methods:

public Square$($double width$)$

public double getWidth$()$

public void setWidth$($double width$)$

public double getArea$()$

$$ Create a class named Rectangle that inherits the Square class and contains these constructors and methods:

public Rectangle$($double width, double height$)$

public double getHeight$()$

public void setHeight$($double height$)$

public double getArea$()$

$$ Use the following formulas to calculate area:

Circle: Area $=$ radius$2*$ pi

Square: Area $=$ width$2$

Rectangle: Area $=$ width $*$ height

$$ Use the Console class $($download from Blackboard, or see in Appendix below$)$ or an enhanced version of it to get and validate the user$$s entries.

$$ Assume the user will enter a valid shape type.

Appendix:

console.java:

import java.util.Scanner;

public class Console $\{$

private static final Scanner sc $=$ new Scanner$($System$.$in$)$;

public static String getString$($String prompt$)\{$

System.out.print$($prompt$)$;

return sc$.$nextLine$()$;

$\}$

public static int getInt$($String prompt$)\{$

while $($true$)\{$

System.out.print$($prompt$)$;

try $\{$

return Integer.parseInt$($sc$.$nextLine$())$;

$\}$ catch$($NumberFormatException e$)\{$

System.out.println$("$Error$!$ Invalid integer value."$)$;

$\}$

$\}$

$\}$

public static int getInt$($String prompt, int min, int max$)\{$

while $($true$)\{$

int value $=$ getInt$($prompt$)$;

if $($value $>$ min && value $<$ max$)\{$

return value;

$\}$ else $\{$

System.out.println$("$Error$!$ Number must be greater than $"$

$+$ min $+"$ and less than $"+$ max $+".")$;

$\}$

$\}$

$\}$

public static double getDouble$($String prompt$)\{$

while $($true$)\{$

System.out.print$($prompt$)$;

try $\{$

return Double.parseDouble$($sc$.$nextLine$())$;

$\}$ catch$($NumberFormatException e$)\{$

System.out.println$("$Error$!$ Invalid integer value."$)$;

$\}$

$\}$

$\}$

public static double getDouble$($String prompt, double min, double max$)\{$

while $($true$)\{$

double value $=$ getDouble$($prompt$)$;

if $($value $>$ min && value $<$ max$)\{$

return value;

$\}$ else $\{$

System.out.println$("$Error$!$ Number must be greater than $"$

$+$ min $+"$ and less than $"+$ max $+".")$;

$\}$

$\}$

$\}$

$\}$