Explain the following Java Abstraction code in details and draw the UML notations diagram.
Explain the following Java Abstraction code in details and draw the UML
notations diagram.
abstract public class Shape
{
private String color;
public Shape (String color)
{
this.color = color;
}
public String toString()
{
return "Shape of color=\"" + color + "\"";
}
abstract public double getArea();
}
public class Rectangle extends Shape
{
private int length;
private int width;
public Rectangle(String color, int length, int width)
{
super(color);
this.length = length;
this.width = width;
}
public String toString()
{
return "Rectangle of length=" + length + " and
width=" + width + ", subclass of " + super.toString();
}
public double getArea()
{
return length*width;
}
}
public class Triangle extends Shape
{
private int base;
private int height;
public Triangle(String color, int base, int height)
{
super(color);
this.base = base;
this.height = height;
}
public String toString()
{
return "Triangle of base=" + base + " and height="
+ height + ", subclass of " + super.toString();
}
public double getArea()
{
return 0.5*base*height;
}
}
public class TestShape
{
public static void main(String[] args)
{
Shape s1 = new Rectangle("red", 4, 5);
System.out.println(s1);
System.out.println("Area is " + s1.getArea());
Shape s2 = new Triangle("blue", 4, 5);
System.out.println(s2);
System.out.println("Area is " + s2.getArea());
//Shape s3 = new Shape("green");
}
}
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