| Java abstract method | | a method in a superclass with the same name | labelling it with the keyword abstract | its caller from only one place which should be the last statement | if related aspects of a system are kept together in this module, and unrelated aspects are kept out | to serve as a placeholder, indicating that subclasses must have concrete implementations | the details of procedures | a comment at its head if the method is non-obvious | public except for those that will definitely need to be called from outside the package | other methods and variables in any class in the same package by default | any executable statements in its body | The Basics of Java | side effects if it does not modify any data, and does not leave behind any information, other than its result, that would have an effect on other computations | Java method | procedural abstraction | a special-purpose function such as the user interface for a particular system | when using a certain procedure, a programmer does not need to worry about all the details of how it performs its computations; he or she only needs to know how to call it and what it computes |
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