Thanks go to the Department of Computer Science at Ryerson University in Canada for the following resources:

Recursion practice questions
Practice exams (select as appropriate for our class)
Sorting exercise

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Self-test exercises from Savitch, Absoute Java

Programming projects from Savitch, Absolute Java

practice HW1

practice HW4

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Select recursion practice questions (solved)

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Practice midterm2

Practice final questions