This guide has been merged into a single, more complete article: Java Comparator & Comparable: The Complete Guide.
Everything that was here — the Comparator contract, the old-school vs. Java 8 approaches, thenComparing() chaining, and null handling — is covered there in full, along with records as sort keys and a reproduced integer-subtraction-overflow bug backed by a real failing test and a runnable companion repository.
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