java edit

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public class RectangleDemo 

{

 public static void main(String ab[])

{

      // Create a Rectangle object.

      Rectangle box = new Rectangle();

      // Set length to 10.0 and width to 20.0.

      box.setLength(10.0);

      box.setWidth(20.0);

      // Display the length.

      System.out.println("The box's length is " +box.getLength());

      // Display the width.

      System.out.println("The box's width is " +box.getWidth());

      // Display the area.

      System.out.println("The box's area is " +box.getArea());

      System.out.println("The box's area is " +box.getPerimeter());

}

}