" ".isEmpty() returns false, but " ".isBlank() returns true — whitespace counts as blank, not empty.
1" ".isEmpty(); // false — length is 1
2" ".isBlank(); // true — whitespace only (Java 11+)
3"abc".isBlank(); // false
I caught myself writing s.trim().isEmpty() again today. String.isBlank() exists since Java 11 and covers exactly this case — plus it is Unicode-aware, so " \u00A0 ".isBlank() also works where trim() misses non-breaking spaces.
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