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import java.util.List; import java.util.ArrayList; class Originator {private String state; // The class could also contain additional data that is not part of the // state saved in the memento.. public void set (String state) {this. state = state; System. out. println ("Originator: Setting state to "+ state);} public Memento saveToMemento {System. out. println ("Originator: Saving to Memento."
Standard input is a stream from which a program reads its input data. The program requests data transfers by use of the read operation. Not all programs require stream input.
The bridge pattern is a design pattern used in software engineering that is meant to "decouple an abstraction from its implementation so that the two can vary independently", introduced by the Gang of Four. [1]
System. out. println (b. x); // outputs 0, because b points to // some object other than a Foo * c ; // declares c to be a pointer to a // Foo object (initially // undefined; could point anywhere) Foo c ; // declares c to be a reference to a Foo // object (initially null if c is a class member; // it is necessary to initialize c before use ...
In Python 3.x the range() function [28] returns a generator which computes elements of the list on demand. Elements are only generated when they are needed (e.g., when print(r[3]) is evaluated in the following example), so this is an example of lazy or deferred evaluation:
Python's tuple assignment, fully available in its foreach loop, also makes it trivial to iterate on (key, value) pairs in dictionaries: for key , value in some_dict . items (): # Direct iteration on a dict iterates on its keys # Do stuff
The term closure is often used as a synonym for anonymous function, though strictly, an anonymous function is a function literal without a name, while a closure is an instance of a function, a value, whose non-local variables have been bound either to values or to storage locations (depending on the language; see the lexical environment section below).
A sample UML class and sequence diagram for the Strategy design pattern. [4]In the above UML class diagram, the Context class does not implement an algorithm directly. . Instead, Context refers to the Strategy interface for performing an algorithm (strategy.algorithm()), which makes Context independent of how an algorithm is impl