// Shape interface
              interface Shape {
                  double getArea();
              }
              
              // Rectangle class implementing Shape
              class Rectangle implements Shape {
                  private double length;
                  private double width;
              
                  public Rectangle(double length, double width) {
                      this.length = length;
                      this.width = width;
                  }
              
                  @Override
                  public double getArea() {
                      return length * width;
                  }
              }
              
              // Circle class implementing Shape
              class Circle implements Shape {
                  private double radius;
              
                  public Circle(double radius) {
                      this.radius = radius;
                  }
              
                  @Override
                  public double getArea() {
                      return Math.PI * radius * radius;
                  }
              }
              
              // Triangle class implementing Shape
              class Triangle implements Shape {
                  private double base;
                  private double height;
              
                  public Triangle(double base, double height) {
                      this.base = base;
                      this.height = height;
                  }
              
                  @Override
                  public double getArea() {
                      return 0.5 * base * height;
                  }
              }
              
              // Main class to test the Shape interface and its implementations
               class ShapeTest {
                  public static void main(String[] args) {
                      // Test Rectangle
                      Rectangle rectangle = new Rectangle(5, 8);
                      System.out.println("Area of Rectangle: " + rectangle.getArea());
              
                      // Test Circle
                      Circle circle = new Circle(4);
                      System.out.println("Area of Circle: " + circle.getArea());
              
                      // Test Triangle
                      Triangle triangle = new Triangle(6, 10);
                      System.out.println("Area of Triangle: " + triangle.getArea());
                  }
              }