Most students think they know what a method will do to an array… until they see the output and realize Java wasn’t playing by their rules. This challenge forces you to decide: Does this method actually change the array, or does it change nothing at all? If you can predict that without guessing, you understand references better than 90% of AP CSA students — and your debugging becomes 10x faster overnight. Follow for more Java clarity, and DM for AP Computer Science help. 💻⚡️ | Daniel Finley - Th
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Most students think they know what a method will do to an array… unti…
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The biggest ArrayList bugs don’t come from the code… they come from treating ArrayLists like they’re just “better arrays.” They’re not. Arrays follow one set of rules. ArrayLists follow a completely different set. And the moment you mix the two — using brackets on an ArrayList, expecting it to resize, calling the wrong length method — your program falls apart. The students who win are the ones who learn the differences, not just the syntax. Follow for more Java clarity, and DM for AP Computer Sc
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