Shape

Circle.java

package extend;

public class Circle extends Shape {
	private double radius;
	private String name = "";
	
	

	


	public double getRadius() {
		return radius;
	}

	public void setRadius(double radius) {
		this.radius = radius;
	}

	@Override
	double perimetr() {
		// TODO Auto-generated method stub
		if (this.radius == 0) {
			double ran = Math.random() * 1000 + 1;
			System.out.println("Radius  is : " + ran +"  !!! (was generated atomaticly) perimetr");
			
		}

		return 2* Math.PI * this.radius;
	}

	@Override
	double area() {
		// TODO Auto-generated method stub
		if (this.radius == 0) {
			double ran = Math.random() * 1000 + 1;
			System.out.println("Radius  is : " + ran +"  !!! (was generated atomaticly)");
			this.radius = ran;

		}

		return Math.pow(this.radius * Math.PI, 2);
	}

}

Desc.java

package extend;

import java.util.Arrays;

public class Desk {

	private Shape[] parts = new Shape[4];

	public Shape[] getParts() {
		return parts;
	}

	public boolean addShapeToPartsDesc(Shape shapeType) {

		boolean isShapeInArray = false;

		for (int i = 0; i < parts.length; i++) {
			if (parts[i] == shapeType) {
				isShapeInArray = true;
				System.out.println("| " + shapeType.getName() + " | Already in use . System can not add ");
				break;
			}
		}

		for (int i = 0; i < parts.length; i++) {

			if (parts[i] == null && !isShapeInArray) {

				parts[i] = shapeType;
				isShapeInArray = true;
				System.out.println("| " + shapeType.getName() + " | Add process  has been successfully completed");

			}

		}

		return isShapeInArray;
	}

	public void deleteShapeFromDescPart(Shape shapeType) {
		for (int i = 0; i < parts.length; i++) {

			if (parts[i] == shapeType) {
				parts[i] = null;
				System.out.println("| " + shapeType.getName() + " | Removal process  has been successfully completed");
			}
		}

	}

	@Override
	public String toString() {
		double result = 0;
		int count = 0;
		StringBuilder sb = new StringBuilder();
		sb.append("\n Desk contains next used parts :");
		for (Shape shape : parts) {
			if (shape != null) {
				count++;
				sb.append("\n");
				sb.append(" Parts  " + count + " :" + shape.getName());

				result = result + shape.area();

			}

		}
		sb.append("\n");
		sb.append("\n Total used parts : " + count);
		sb.append("\n Amount all areas of shapes : ").append(result);
		return sb.toString();
	}

}

Main.java

package extend;

public class Main {

	public static void main(String[] args) {
		

		
Circle crl = new Circle();
crl.setName("Circle");
crl.setRadius(2.97);

Square sqr = new Square();
sqr.setName("Square");
sqr.setSideA(2.29);

Triangle trl = new Triangle();
trl.setName("Triangle");
trl.setSideA(23.20);
trl.setSideB(22.30);
trl.setSideC(21.80);

Desk desc= new Desk();
desc.addShapeToPartsDesc(trl);
desc.addShapeToPartsDesc(crl);
desc.addShapeToPartsDesc(sqr);

System.out.println(desc);

System.out.println( "\n");
desc.addShapeToPartsDesc(trl);
desc.addShapeToPartsDesc(crl);
desc.addShapeToPartsDesc(sqr);

System.out.println(desc);

System.out.println( "\n");
desc.deleteShapeFromDescPart(trl);

System.out.println(desc);

	}	
}

Point.java

package extend;

public abstract 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;
	}
	
	
	
	
	
	
}

Shape.java

package extend;

public abstract class Shape extends Point {
	private String name ;
	
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	abstract double perimetr();
	abstract double area();
	
	
	
	

}

Square.java

package extend;

public class Square extends Shape {
	private double sideA;

	public double getSideA() {
		return sideA;
	}

	public void setSideA(double sideA) {
		this.sideA = sideA;
	}

	@Override
	double perimetr() {
		return this.sideA * 4;
	}

	@Override
	double area() {
		return Math.pow(this.sideA, 2);
	}

}

Triangl.java

package extend;

public class Triangle extends Shape {
	private double sideA;
	private double sideB;
	private double sideC;

	public double getSideA() {
		return sideA;
	}

	public void setSideA(double sideA) {
		this.sideA = sideA;
	}

	public double getSideB() {
		return sideB;
	}

	public void setSideB(double sideB) {
		this.sideB = sideB;
	}

	public double getSideC() {
		return sideC;
	}

	public void setSideC(double sideC) {
		this.sideC = sideC;
	}

	@Override
	double perimetr() {
		// TODO Auto-generated method stub

		return this.sideA + this.sideB + this.sideC;
	}

	@Override
	double area() {
		// TODO Auto-generated method stub
		this.sideA = (this.sideA == 0) ? Math.random() * 100 + 1 : this.sideA;
		this.sideB = (this.sideB == 0) ? Math.random() * 100 + 1 : this.sideB;
		this.sideC = (this.sideC == 0) ? Math.random() * 100 + 1 : this.sideC;

		double p = (this.sideA + this.sideB + this.sideC) / 2;

		return Math.sqrt(p * (p - this.sideA) * (p - this.sideB) * (p - this.sideC));

	}

}