Create an abstract class Shape. It contains two attributes: x and y, which indic

Question

Create an abstract class Shape. It contains two attributes: x and y, which indicate the coordinates in the 2-dimensional coordinate axis. It also has a method called area(), which is designed to display the area of the shape. Based on the Shape class, design a class named Circle with radius r and a class named Square with length of side l. They need to implement their area() methods. Create a Test class to instantiate a Circle object c with radius of 5 and a Square object s with length of side of 10. Their coordinates are randomly selected. Print their area in polymorphism form.

Explanation / Answer

///abstract base class Shape

abstract class Shape
{
public int x,y;

public abstract double area();
  
}

class Circle extends Shape //inheritance
{
  
public Circle(int radius) //constructor
{
x = radius;
}

public double area()
{
return 3.14*x*x;
}
public String toString()
{
return " Circle : Area :"+ area() +" square units";
}
  

}
class Square extends Shape
{

public Square(int side)
{
x = side;
}

public double area()
{
return x*x;
}
public String toString()
{
return " Square : Area :"+ area()+" square units" ;
}
  
  
}
class Test
{
public static void main(String[]args)
{
// Create circle r = 5
Circle c1 = new Circle(5);
System.out.println(c1);

// Create square wtih s=10
Square s1 = new Square(10);
System.out.println(s1);
}
}

Output:

Circle : Area :78.5 square units

Square : Area :100.0 square units

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