Question

Given the following UML class diagram, implement the class as described by the model. Use your best judgment when implementing the code inside of each method.

+---------------------------------------------------+
| Polygon |
+---------------------------------------------------+
| - side_count : int = 3 |
| - side_length : double = 1.0 |
+---------------------------------------------------+
| + Polygon() |
| + Polygon(side_count : int) |
| + Polygon(side_count : int, side_length : double) |
| + getSides() : int |
| + setSides(side_count : int) |
| + getSideLength() : double |
| + setSideLength(side_length : double) |
| + perimeter() : double |
+---------------------------------------------------+

The following information might also be useful:

- The perimeter of a polygon is the sum of it's side lengths.
- Side counts of less than 3 are meaningless for a polygon, and should not be accepted.
- Side lengths of less than 0 are meaningless for a polygon, and should not be accepted.

Answer 1

class Polygon {
   private int side_count;
   private double side_length;

   public Polygon() {

       side_count = 3;
       side_length = 1;
   }

   public Polygon(int s) {
       //checking if values are valid
       if (s >= 3)
           side_count = s;
       side_length = 1;
   }

   public Polygon(int s, double l) {
       //checking if values are valid
       if (s >= 3 && l >= 1) {
           side_count = s;
           side_length = l;
       }
   }

   public int getSides() {
       return side_count;
   }

   public void setSides(int s) {
       //checking if values are valid
       if (s >= 3)
           side_count = s;
   }

   public double getSideLength() {
       return side_length;
   }

   public void setSideLength(double l) {
       //checking if values are valid
       if (l >= 1)
           side_length = l;
   }

   //sides * length
   public double perimeter() {
       return side_count * side_length;
   }
}

public class TestPolygon {
   public static void main(String[] args) {
       Polygon p= new Polygon(5, 15);
       System.out.println("Perimeter : "+p.perimeter());
   }
}

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