RectangleRunner.java

public class RectangleRunner{
   public static void main(String[] args){
      //Instantiation of r1
      Rectangle r1 = new Rectangle();
      //Call methods on r1
      r1.setLength(5.0);
      r1.setWidth(3.0);
      System.out.println( r1.area() );
      r1.setLength(4.0);
      System.out.println( r1.area() );
   }
}