Copy constructors and defensive copying

Question

What is a copy constructor?

Can someone share a small example that can be helpful to understand along with defensive copying p

Answer 1

This is where you create a new object, by passing an old object, copying its values.

Color copiedColor = new Color(oldColor);

instead of :

Color copiedColor = new Color(oldColor.getRed(),
                              oldColor.getGreen(), oldColor.getBlue());