This post has been merged into a newer, more comprehensive guide: Add Two Numbers in Java Without Overflow: addExact, Widening, and BigInteger. It covers the full Math “exact” arithmetic family — addExact, subtractExact, multiplyExact, incrementExact, decrementExact, negateExact, toIntExact, and absExact — with real, verified output for every claim, plus the silent-overflow wraparound bug, widening to long, and BigInteger.
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