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* Instance methods – belong to ''individual objects'', and have access to instance variables for the specific object they are called on, inputs, and class variables
Depending on the definition of the language, subclasses may or may not be able to override the methods defined by superclasses. [[Multiple inheritance]] is allowed in some languages, though this can make resolving overrides complicated. Some languages have special support for other concepts like [[Trait (computer programming)|traits]] and [[mixin]]s, though, in any language with multiple inheritance, a mixin is simply a class that does not represent an is-a-type-of relationship. Mixins are typically used to add the same methods to multiple classes. For example, class
[[Abstract class]]es cannot be instantiated into objects; they exist only for inheritance into other "concrete" classes that can be instantiated. In Java, the <code>[[final (Java)|final]]</code> keyword can be used to prevent a class from being subclassed.{{sfn|Bloch|2018|loc=Chapter §2 Item 4 Enforce noninstantiability with a private constructor|p=19}}
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