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BHSawesome2 AP CSA Java 2025+

Section 4.55 Recursion Summary

In this unit you learned about recursion. A recursive method calls itself (contains a call to the method from inside of the method). A recursive method should have at least one way to stop the recursion. This is called a base case.
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Subsection 4.55.1 Concept Summary

  • base case - A way to stop the recursive calls. This is a return without a recursive call.
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  • call stack - The call stack keeps track of the methods that are called while the code executes. It keeps track of the local variables and where the call will return to.
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  • recursive method - A method that contains at least one call to itself inside the method.
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Subsection 4.55.2 Vocabulary Practice

Activity 4.55.1.

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Subsection 4.55.3 Common Mistakes

  • Missing the recursive call. Be sure to look for a call to the same method.
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  • Getting confused about when a recursive method returns and what it returns.
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  • Assuming you understand what the recursion is doing without tracing all of it.
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