There are many common memory aids to help students remember concepts.
One method is arrangeing the letters of the list into a word. For example, Roy. B. Giv for the colours of the spectrum, BEDMAS for the order of operations and SOHCAHTOA for trigonometry.
Another method is to use linking words and to create a mental picture. For example, to remember that v.size() is the way of looking up size of a vector you might use the following method. Vector might remind us of the word convict (sound the same). The word size might remind us of a pair of jeans. The two brackets might remind us of a circle.
Then, we need to concoct a crazy mental picture to link all of them. It is very important that the mental picture be silly so that we can remember it. For instance, I might picture a person wearing orange prison wear, climbing out a window using a pair of jeans as a rope. Sadly, the guards are on to him and there is a circular red laser riffle scope on his back.
TASK
Your task is to create TWO memory aids to help you remember that you extend a class (which has code) and implement an interface (which is only an outline).
You may work with a partner. Be prepared to share your solution with the class.