Наследование фигуры

Foursquare.java

public class Foursquare extends Shape {
    
	 private Point A;
	 private Point B;
	 private Point C;
	 private Point D;
	 
	 
	 
	public Foursquare(Point a, Point b, Point c, Point d) {
		super();
		A = a;
		B = b;
		C = c;
		D = d;
	}
	public Point getA() {
		return A;
	}
	public void setA(Point a) {
		A = a;
	}
	public Point getB() {
		return B;
	}
	public void setB(Point b) {
		B = b;
	}
	public Point getC() {
		return C;
	}
	public void setC(Point c) {
		C = c;
	}
	public Point getD() {
		return D;
	}
	public void setD(Point d) {
		D = d;
	}
	
	@Override
	double getPerimetr() {
		
		return A.getDistance(B)+B.getDistance(C)+C.getDistance(D)+D.getDistance(A);
	}
	
	@Override
	double getArea() {
		
		return A.getDistance(B)*B.getDistance(C);
	}
	
	@Override
	String getInfo() {
		
		return "Foursquare:   Area =   "+this.getArea()+"  Perimetr =  " + this.getPerimetr();
	}
	
	
	 
	
	 
}

Main.java

public class Main {

	public static void main(String[] args) {
		Point A=new Point(0,0);
		Point B=new Point(0,4);
		Point C=new Point(3,0);
		Point D=new Point(0,5);
		Point E=new Point(5,3);
		
		Triangular tr=new Triangular(A, B, C);
		calc(tr);
		Foursquare fs=new Foursquare(A, B, C, D);
        calc(fs);
        Pentagon pt = new Pentagon(A, B, C, D, E);
        calc(pt);
	}
static void calc (Shape a){
	System.out.println(a.getInfo());
}
}

Pentagon.java

public class Pentagon extends Shape {
	private Point A;
	private Point B;
	private Point C;
	private Point D;
	private Point E;

	public Point getA() {
		return A;
	}

	public void setA(Point a) {
		A = a;
	}

	public Point getB() {
		return B;
	}

	public void setB(Point b) {
		B = b;
	}

	public Point getC() {
		return C;
	}

	public void setC(Point c) {
		C = c;
	}

	public Point getD() {
		return D;
	}

	public void setD(Point d) {
		D = d;
	}

	public Point getE() {
		return E;
	}

	public void setE(Point e) {
		E = e;
	}

	public Pentagon(Point a, Point b, Point c, Point d, Point e) {
		super();
		A = a;
		B = b;
		C = c;
		D = d;
		E = e;
	}

	@Override
	double getPerimetr() {
		return A.getDistance(B) + B.getDistance(C) + C.getDistance(D)
				+ D.getDistance(E) + E.getDistance(A);

	}

	@Override
	double getArea() {
		Triangular tr1 = new Triangular(A,B,C);
		double p1 = tr1.getPerimetr() / 2.0 ;
		
		Triangular tr2 = new Triangular(A,C,E);
		double p2 = tr2.getPerimetr() / 2.0 ;
		
		Triangular tr3 = new Triangular(C,E,D);
		double p3 = tr3.getPerimetr() / 2.0 ;
		double s1 = Math.sqrt(p1 * (p1 - A.getDistance(B)) * (p1 - B.getDistance(C)) * (p1 - C.getDistance(A)));
		double s2 = Math.sqrt(p2 * (p2 - A.getDistance(C)) * (p2 - C.getDistance(E)) * (p2 - E.getDistance(A)));
		double s3 = Math.sqrt(p3 * (p3 - C.getDistance(D)) * (p3 - D.getDistance(E)) * (p3 - E.getDistance(C)));
		return s1+s2+s3;
	}

	@Override
	String getInfo() {
		return "Pentagon : Area =   "+ this.getArea()+ "  Perimetr =  " + this.getPerimetr();
	}

}

Point.java

public class Point {
	private double x;
	private double y;

	public double getX() {
		return x;
	}

	public void setX(double x) {
		this.x = x;
	}

	public double getY() {
		return y;
	}

	public void setY(double y) {
		this.y = y;
	}

	public Point(double x, double y) {
		super();
		this.x = x;
		this.y = y;
	}

	public double getDistance(Point a) {
		double x=(this.x-a.getX())*(this.x-a.getX());
		double y=(this.y-a.getY())*(this.y-a.getY());
		return Math.sqrt(x+y);
	}
}

Shape.java

public abstract class Shape {
	abstract double getPerimetr();
	abstract double getArea();
    abstract String getInfo();
}

Triangular.java

public class Triangular extends Shape {

	public Triangular(Point a, Point b, Point c) {
		super();
		A = a;
		B = b;
		C = c;
	}

	private Point A;
	private Point B;
	private Point C;

	public Point getA() {
		return A;
	}

	public void setA(Point a) {
		A = a;
	}

	public Point getB() {
		return B;
	}

	public void setB(Point b) {
		B = b;
	}

	public Point getC() {
		return C;
	}

	public void setC(Point c) {
		C = c;
	}

	@Override
	double getPerimetr() {

		return A.getDistance(B) + B.getDistance(C) + C.getDistance(A);
	}

	@Override
	double getArea() {
		double a = A.getDistance(B);
		double b = B.getDistance(C);
		double c = C.getDistance(A);
		double p = this.getPerimetr() / 2.0;
		return Math.sqrt(p * (p - a) * (p - b) * (p - c));
	}

	@Override
	String getInfo() {

		return "Triangular : Area = " + this.getArea() + "  Perimetr = "
				+ this.getPerimetr();
	}

}