回答編集履歴
1
つい癖でiと書いてしまった
answer
CHANGED
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@@ -6,7 +6,7 @@
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6
6
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StringBuilder sb = new StringBuilder();
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7
7
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sb.append(i);
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8
8
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int end = sb.charAt(0) == '-' ? 1 : 0;
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9
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-
for (int x = sb.length() - 3; x > end;
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9
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+
for (int x = sb.length() - 3; x > end; x -= 3) {
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10
10
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sb.insert(x, ',');
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11
11
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}
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12
12
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char[] arr = new char[sb.length()];
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