Merge pull request #426 from Yachika9925/patch-4

Create interface.java

Author: kishanrajput23

interface.java

@@ -0,0 +1,28 @@
+interface Shape {
+    double area();
+    double perimeter();
+}
+
+class Circle implements Shape {
+    private double radius;
+
+    public Circle(double radius) {
+        this.radius = radius;
+    }
+
+    public double area() {
+        return Math.PI * radius * radius;
+    }
+
+    public double perimeter() {
+        return 2 * Math.PI * radius;
+    }
+}
+
+public class InterfaceDemo {
+    public static void main(String[] args) {
+        Circle circle = new Circle(5.0);
+        System.out.println("Circle Area: " + circle.area());
+        System.out.println("Circle Perimeter: " + circle.perimeter());
+    }
+}