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OOP/Java/Lab/Week8/RecCircleInterface/RecCircleInterface.java

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+import java.util.Scanner;
+
+// Define the interface with a method to compute the area
+interface AreaComputable {
+    double computeArea();
+}
+
+// Rectangle class implementing AreaComputable interface
+class Rectangle implements AreaComputable {
+
+    private double length;
+    private double width;
+
+    // Constructor to initialize rectangle dimensions
+    public Rectangle(double length, double width) {
+        this.length = length;
+        this.width = width;
+    }
+
+    // Implement computeArea() method
+    public double computeArea() {
+        return length * width;
+    }
+}
+
+// Circle class implementing AreaComputable interface
+class Circle implements AreaComputable {
+
+    private double radius;
+
+    // Constructor to initialize circle radius
+    public Circle(double radius) {
+        this.radius = radius;
+    }
+
+    // Implement computeArea() method
+    public double computeArea() {
+        return Math.PI * radius * radius;
+    }
+}
+
+// Main class to run the program
+public class RecCircleInterface {
+
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+
+        // Input and compute area of the rectangle
+        System.out.println("Enter length and width of the rectangle:");
+        double length = scanner.nextDouble();
+        double width = scanner.nextDouble();
+        Rectangle rectangle = new Rectangle(length, width);
+        System.out.println("Area of Rectangle: " + rectangle.computeArea());
+
+        // Input and compute area of the circle
+        System.out.println("Enter radius of the circle:");
+        double radius = scanner.nextDouble();
+        Circle circle = new Circle(radius);
+        System.out.println("Area of Circle: " + circle.computeArea());
+
+        scanner.close();
+    }
+}