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OOP/Java/Lab/Week8/RecCircleAbstract/RecCircleAbstract.java

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+import java.util.Scanner;
+
+abstract class Shape {
+
+    abstract double calculateArea();
+}
+
+class Rectangle extends Shape {
+
+    double length;
+    double width;
+
+    Rectangle(double length, double width) {
+        this.length = length;
+        this.width = width;
+    }
+
+    double calculateArea() {
+        return length * width;
+    }
+}
+
+class Circle extends Shape {
+
+    double radius;
+
+    Circle(double radius) {
+        this.radius = radius;
+    }
+
+    double calculateArea() {
+        return Math.PI * radius * radius;
+    }
+}
+
+class RecCircleAbstract {
+
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+
+        System.out.print("Enter rectangle length: ");
+        double length = scanner.nextDouble();
+        System.out.print("Enter rectangle width: ");
+        double width = scanner.nextDouble();
+
+        Rectangle rectangle = new Rectangle(length, width);
+        System.out.println("Rectangle area: " + rectangle.calculateArea());
+
+        System.out.print("Enter circle radius: ");
+        double radius = scanner.nextDouble();
+
+        Circle circle = new Circle(radius);
+        System.out.println("Circle area: " + circle.calculateArea());
+
+        scanner.close();
+    }
+}