Create 387.md#15
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nodchip
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May 14, 2026
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| for (int i = 0; i < s.length(); i++) { | ||
| if (frequency.get(s.charAt(i)).equals(1)) { |
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if (frequency.get(s.charAt(i)) == 1) {と書いても、アンボクシングされるため、意図通り動くようです。
https://docs.oracle.com/javase/specs/jls/se17/html/jls-15.html#jls-15.21.1
If the operands of an equality operator are both of numeric type, or one is of numeric type and the other is convertible (§5.1.8) to numeric type, binary numeric promotion is performed on the operands (§5.6).
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コメントありがとうございます！
等号演算子を使ったとき、片方がプリミティブであり、もう片方がアンボクシング可能ならアンボクシングされてから演算されるのですね。
Cluadeは Integer == Integer の比較になると言っていましたが、危うく嘘を信じ込むところでした。。
一次情報をもっと読み込むべきでした。
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387. First Unique Character in a Stringを解きました、レビューをお願いします