Web Reference: Jul 23, 2025 · When a method is passed illegal or unsuitable arguments, an IllegalArgumentException is thrown. The program below has a separate thread that takes a pause and then tries to print a sentence. I would use IllegalArgumentException to do last ditch defensive argument checking for common utilities (trying to stay consistent with the JDK usage). Or where the expectation is that a bad argument is a programmer error, similar to an NullPointerException. Feb 3, 2026 · I’ll show you the patterns I actually use in modern Java (17+), with runnable examples and practical guidance on when to catch it, when to prevent it, and when to throw it yourself.
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