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Java Programming Language

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Java Practical Programs


Aim


Write a Java program to create an abstract class named Shape that contains two integers and an empty method named print Area (). Provide three classes named Rectangle, Triangle, and Circle such that each one of the classes extends the class Shape. Each one of the classes contains only the method print Area () that prints the area of the given shape.

Implementation


Java Program
import java.util.*;

abstract class Shape {
	int length, breadth, radius;

	Scanner input = new Scanner(System.in);

	abstract void printArea();

}

class Rectangle extends Shape {
	void printArea() {
		System.out.println("*** Finding the Area of Rectangle ***");
		System.out.print("Enter length and breadth: ");
		length = input.nextInt();
		breadth = input.nextInt();
		System.out.println("The area of Rectangle is: " + length * breadth);
	}
}

class Triangle extends Shape {
	void printArea() {
		System.out.println("\n*** Finding the Area of Triangle ***");
		System.out.print("Enter Base And Height: ");
		length = input.nextInt();
		breadth = input.nextInt();
		System.out.println("The area of Triangle is: " + (length * breadth) / 2);
	}
}

class Cricle extends Shape {
	void printArea() {
		System.out.println("\n*** Finding the Area of Cricle ***");
		System.out.print("Enter Radius: ");
		radius = input.nextInt();
		System.out.println("The area of Cricle is: " + 3.14f * radius * radius);
	}
}

public class AbstractClassExample {
	public static void main(String[] args) {
		Rectangle rec = new Rectangle();
		rec.printArea();

		Triangle tri = new Triangle();
		tri.printArea();
		
		Cricle cri = new Cricle();
		cri.printArea();
	}
}

Result



   Download Source Code

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