public class Rectangle extends GeometricObject {
  //inherits from superclass GeometricObject: 
  //  methods: getColor setColor isFilled setFilled getDateCreated toString
  //  Can not directly access inherited 'color' 'filled' 'dateCreated' fields
  //  because they are private in superclass.
  private double width;
  private double height;

  public Rectangle() {
    //compiler inserts: super(); //call of superclass' 0-arg constructor
  }

  public Rectangle(double width, double height) {
    //compiler inserts: super();
    this.width = width;
    this.height = height;  
  }

  public double getWidth() {
    return width;
  }

  public void setWidth(double width) {
    this.width = width;
  }

  public double getHeight() {
    return height;
  }

  public void setHeight(double height) {
    this.height = height;
  }

  public double getArea() {
    return width * height;
  }

  public double getPerimeter() {
    return 2 * (width + height);
  }
}