A simple analogy of Java classes, instances, and objects. .. .. [Series that makes you feel like you understand]

Explaining what is different from a class or an instance so that people can imagine it softly

Overview of each

• object A group of things with state and behavior. Classes are also objects, and instances are also objects.

--Class A type that collects the common states and behaviors of objects. Design documents.

• instance The reality generated from the class. The actual situation generated from the design document.

Speaking of cooking

• object The material. When it comes to cooking, "tuna" or "salmon". In Java, it mainly corresponds to variables and methods. I don't know.

--Class A recipe. It feels like a recipe death that makes "tuna sashimi" by combining a variable called "tuna" with a method called "cutting". However, it is just a recipe, not "tuna sashimi" itself.

• instance A dish made from a recipe. It's the "tuna sashimi" itself made from the "tuna sashimi" recipe.