객체지향 용어 정리

1. Class - A class is a model of an entity or object.
2. Instance - An instance is a nonspecific actualization of the class.
3. Object - An object is a specific actualization of the class model, created at runtime, which uses the class as a template.
4. Message - A message is a specific behavior undertaken by the object, requesting the receiver to perform a behavior.
5. Method - Methods are the associated actions performed by an object when it receives the message.