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:''Explicit case analysis on the type of an object is usually an error, the designer should use polymorphism in m Type switches involve changing behaviour based on the object's type. Problems occur when multiple switches occur over the same variable in the

...turing code to make it easier to use, cleaner to work with, and removing [[Code smells]]. An alternative definition is "Extending a program to make it more ...ure of [[If it ain't broke don't fix it]] by allowing developers to change code to meet their own needs, rather than for fixing bugs or adding features. It

For example your code looks like: Replace your check for a null reference with a null object

* Replace the Pair class with a Transaction class and two subclasses CreditTransaction and DebitTransacti ...ed differently depending on the types of its objects, which will require a type switch.

...one from the subclass. It is also common if subclasses augment rather than replace the superclasses main task. ...t it is bad practice in general to call superclass methods from overriding subclass methods. It is only bad for the superclass to expect that its method will b

# Fill in the formula with values from the Data Summary To help guide my thinking I considered the design in terms of [[code smells]], [[riel's heuristics]] and general [[design maxims]]. This is not

...e of a bulk file modification tool. It's a classic example of writing some code, then coming back after a few years and thinking "Who wrote this #&%?" only ... a list of actions to perform on these files. These actions include find & replace actions, text insertion and deletion, case changes and encoding changes. Fo

*If a user has problems with registering a device, they can use the app to send an assistance request to ... current device, if they know the e-mail address the device was registered with.