From printTriangularNumber to Duff’s Device: Mastering Java Switch Statements Old and New

Java's switch statement has evolved significantly since its early fall-through-prone days. This post traces that journey using triangular number computation as a practical example of intentional fall-through, connects the technique to Duff's Device loop-unrolling from 1983, compares old and new switch syntax including yield, and offers guidance on when each form is appropriate for modern Java development.


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