Web Reference: One such error is the dreaded undefined method 'course' for nil:NilClass, which may seem perplexing at first glance. Let’s break down the problem and illustrate how to resolve it for smooth... Learn how to fix undefined errors in Java method calls with step-by-step guidance, examples, and best practices. However, you might want to consider making a private helper method called calculateCost, so that you're not duplicating code between your constructor and your setOrder methods.
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