Level 3 programs

AbstractClassProgram.java

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+/*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.*/
+
+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 AbstractClassProgram {
+	public static void main(String[] args) {
+		Rectangle rec = new Rectangle();
+		rec.printArea();
+
+		Triangle tri = new Triangle();
+		tri.printArea();
+		
+		Cricle cri = new Cricle();
+		cri.printArea();
+	}
+}