polygons

class Point {
    private float x;
    private float y;

    public Point(float x, float y) {
        changeCoords(x, y);
    }

    public void changeCoords(float x, float y) {
        this.x = x;
        this.y = y;
    }

    @Override
    public String toString() {
        return "(" + x + ", " + y + ")";
    }
}

class Polygon {
    private final Point[] points;

    public Polygon(int n) {
        points = new Point[n];
        for (int i = 0; i < n; i++) {
            points[i] = new Point(0, 0);
        }
    }

    public Polygon(float[] coords) {
        if (coords.length % 2 != 0) {
            throw new IllegalArgumentException("len is odd");
        }
        int n = coords.length / 2;
        this(n);
        for (int i = 0; i < n; i++) {
            points[i] = new Point(coords[2 * i], coords[2 * i + 1]);
        }
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder("Polygon: ");
        for (Point p : points) {
            sb.append(p.toString()).append(" ");
        }
        return sb.toString();
    }
}

public class Main {
    public static void main(String[] args) {
        Polygon poly1 = new Polygon(3);
        System.out.println(poly1);

        float[] coords = {0, 0, 1, 0, 1, 1, 0, 1};
        Polygon poly2 = new Polygon(coords);
        System.out.println(poly2);
    }
}