Question

Write a simple class representing a Polygon up to 6 sides: the Polygon class has 5 fields: Regular, sides, sideLength, angle, apothem

Polygon:
Regular: boolean
sides: int
sideLength: double
angle : double
apothem : double

• Provide a no-arg constructor for this class initializes the object and sets the instance variables to:
  Regular: true
  sides: 3
  sideLength: 1
  angle : 60
  apothem : SquareRoot(3)/2
• Provide the following methods:
• Set number of sides
• set the length of the sides
• set the angle of the polygon
• set the length of the apothem
• find the apothem
• determine the type of polygon by evaluating the number of sides
• Calculate the area of the Polygon based on the number of sides
• calculate the perimeter
• Equal to : To compare the Polygon to another ( returning true or false)
• display Polygon information as a string of data
• Provide few cases where a class is initialized, using a constructor
• Provide few cases where these methods are called.

Answer 1

Polygon class

public class Polygon {
private boolean Regular;
private int sides;
private double sideLength,angle,apothem;

public Polygon()
{
this.Regular=true;
this.sides= 3;
this.sideLength= 1;
this.angle = 60;
this.apothem = Math.sqrt(3)/2;
}

public void setSides(int sides) {
this.sides = sides;
}

public void setSideLength(double sideLength) {
this.sideLength = sideLength;
}

public void setAngle(double angle) {
this.angle = angle;
}

public void setApothem(double apothem) {
this.apothem = apothem;
}
public void findApothem()
{
this.apothem = Math.sqrt(sides)/2;
}
public String getType()
{
if(sides==3)
return "Triangle";
else if(sides==4)
return "Recangle";
else if(sides==5)
return "Pentagon";
else
return "Hexagon";
  
}
public double getPerimeter()
{
return sides*sideLength;
}

@Override
public int hashCode() {
int hash = 7;
return hash;
}

@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
final Polygon other = (Polygon) obj;
if (this.Regular != other.Regular) {
return false;
}
if (this.sides != other.sides) {
return false;
}
if (Double.doubleToLongBits(this.sideLength) != Double.doubleToLongBits(other.sideLength)) {
return false;
}
if (Double.doubleToLongBits(this.angle) != Double.doubleToLongBits(other.angle)) {
return false;
}
if (Double.doubleToLongBits(this.apothem) != Double.doubleToLongBits(other.apothem)) {
return false;
}
return true;
}
  
@Override
public String toString() {
return "\nThe Polygon is : "+getType()+ "\nsides=" + sides + ",\nSide Length = " + sideLength + ",\nAngle = " + angle + "\nApothem=" + apothem + "\nPerimeter: "+getPerimeter();
}
  
}

Main..java driver

public class Main {

/**
* @param args the command line arguments
*/
public static void main(String[] args) {
Polygon p1=new Polygon();
Polygon p2=new Polygon();
p2.setAngle(60);
p2.setSideLength(20);
p2.setSides(6);
p2.findApothem();
System.out.println(p1);
System.out.println(p2);
System.out.println("\nIf p1 and p2 are equals: "+p1.equals(p2));
}
  
}

output

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