Introduce Null Object
From CSSEMediaWiki
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if (customer == null) plan = BillingPlan.basic(); | if (customer == null) plan = BillingPlan.basic(); | ||
else plan = customer.getPlan(); | else plan = customer.getPlan(); | ||
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== Solution == | == Solution == | ||
Revision as of 02:50, 28 September 2008
Summarised from Refactoring Martin Fowler 1999
Motivation
You have repeated checks for a null value
For example your code my look like:
if (customer == null) plan = BillingPlan.basic(); else plan = customer.getPlan();
Solution
Replace your check for a null value with a null object
