I need help with this exercise in Java. Here is the exercise. Please make it a s
ID: 3792289 • Letter: I
Question
I need help with this exercise in Java. Here is the exercise. Please make it a simple and basic code, if possible. Thank you.
In an n-sided regular polygon, all sides have the same length and all angles have the same degree (i.e., the polygon is both equilateral and equiangular). Design a class named RegularPolygon that contains:
A private int data field named n that defines the number of sides in the polygon with default value of 3.
A private double data field named side that stores the length of the side with default value of 1.
A private double data field named x that defines the x-coordinate of the polygon’s center with default value of 0.
A private double data field named y that defines the y-coordinate of the polygon’s center with default value of 0.
A no-arg constructor that creates a regular polygon with default values.
A constructor that creates a regular polygon with the specified number of sides and length of side, centered at (0 , 0 ).
A constructor that creates a regular polygon with the specified number of sides, length of side, and x- and y-coordinates.
Create a get and set method for each of the properties.
The method getPerimeter() that returns the perimeter of the polygon.
The method getArea() that returns the area of the polygon. The formula for computing the area of a regular polygon is Area=(n * side * side) / (Math.tan(Math.PI / n) * 4)
Draw the UML diagram for the class and then implement the class.
Write a test program that creates three RegularPolygon objects, created using the no-arg constructor, using RegularPolygon(6, 4) , and using RegularPolygon(10, 4, 5.6, 7.8) . For each object, display its perimeter and area.
Explanation / Answer
// RegularPolygon.java
public class RegularPolygon
{
private int n;
private double side;
private double x;
private double y;
public RegularPolygon()
{
n = 3;
side = 1;
x = 0;
y = 0;
}
public RegularPolygon(int n, double side)
{
this.n = n;
this.side = side;
x = 0;
y = 0;
}
public RegularPolygon(int n, double side, double x, double y)
{
this.n = n;
this.side = side;
this.x = x;
this.y = y;
}
public int getn()
{
return n;
}
public void setn(int n)
{
this.n = n;
}
public double getside()
{
return side;
}
public void setside(double side)
{
this.side = side;
}
public double gety()
{
return y;
}
public void sety(double y)
{
this.y = y;
}
public double getx()
{
return x;
}
public void setx(double x)
{
this.x = x;
}
public double getPerimeter()
{
return n * side;
}
public double getArea()
{
return (n * side * side) / (Math.tan(Math.PI / n)*4.0);
}
public static void main(String[] args)
{
RegularPolygon polygon1 = new RegularPolygon();
RegularPolygon polygon2 = new RegularPolygon(6,4);
RegularPolygon polygon3 = new RegularPolygon(10,4,5.6,7.8);
System.out.printf("Polygon #1 Area = %.2f Perimeter = %.2f ",polygon1.getArea(), polygon1.getPerimeter());
System.out.printf("Polygon #2 Area = %.2f Perimeter = %.2f ",polygon2.getArea(), polygon2.getPerimeter());
System.out.printf("Polygon #3 Area = %.2f Perimeter = %.2f ",polygon3.getArea(), polygon3.getPerimeter());
}
}
/*
output:
Polygon #1 Area = 0.43 Perimeter = 3.00
Polygon #2 Area = 41.57 Perimeter = 24.00
Polygon #3 Area = 123.11 Perimeter = 40.00
*/