(The Colorable interface) Design an interface named Colorable with a void method named howToColor(). Every class of a colorable object must implement the Colorable interface. Design a class named Square that extends GeometricObject and implements Colorable. Implement howToColor to display the message Color all four sides. The Square class contains a data field side with getter and setter methods, and a constructor for constructing a Square with a specified side. The Square class has a private double data field named side with its getter and setter methods. It has a no-arg constructor to create a Square with side 0, and another constructor that creates a Square with the specified side. Draw a UML diagram that involves Colorable, Square, and GeometricObject. Write a test program that creates an array of five GeometricObjects. For each object in the array, display its area and invoke its howToColor method if it is colorable.

I'm sorry, but your question seems to be about a programming problem rather than a general knowledge question. However, I can help you with the solution.

Here's the UML diagram involving Colorable, Square, and GeometricObject:

             +----------------+                        +-----------------+
             |    Colorable   |                        | GeometricObject |
             +----------------+                        +-----------------+
             |  howToColor()  |                        |    -color: String|
             +----------------+                        |    +GeometricObject()|
                         △                              |    +getArea(): double|
                         |                              |    +getPerimeter(): double|
                         |                              +-----------------+
                         |                                         △
                         |                                         |
             +----------------+                        +-----------------+
             |     Square     |                        |    Circle       |
             +----------------+                        +-----------------+
             |  -side: double |                        |  -radius: double|
             +----------------+                        +-----------------+
             |    +Square()   |                        |    +Circle()    |
             |    +Square(s:double)|                    |    +Circle(r:double)|
             | +getSide(): double |                     | +getRadius(): double|
             | +setSide(s: double)|                     +-----------------+
             | +howToColor()   |
             +-----------------+

And here's the test program that creates an array of five GeometricObjects and invokes their area and howToColor methods if they are colorable:

public class TestGeometricObjects {
  public static void main(String[] args) {
    GeometricObject[] objects = new GeometricObject[5];
    objects[0] = new Square(5);
    objects[1] = new Circle(3);
    objects[2] = new Square(8);
    objects[3] = new Circle(2);
    objects[4] = new Square(3);

    for (int i = 0; i < objects.length; i++) {
      System.out.println("Object " + (i+1) + " - Area: " + objects[i].getArea());
      if (objects[i] instanceof Colorable) {
        ((Colorable)objects[i]).howToColor();
      }
    }
  }
}