回答編集履歴
1
清書版
test
CHANGED
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@@ -31,3 +31,31 @@
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31
31
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System.out.println(b);
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32
32
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33
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```
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34
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+
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35
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36
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37
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# 清書版（ステップ数削減ｗ）
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38
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39
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40
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41
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```
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42
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43
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long a = -30456423424563463L;
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44
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45
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String b = Long.toString(a);
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46
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47
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Pattern p = Pattern.compile("([0-9])([0-9]{3}(,.*)*)$");
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48
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50
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51
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while (p.matcher(b).find())
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52
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53
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b = p.matcher(b).replaceFirst("$1,$2");
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54
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56
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57
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System.out.println(b);
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58
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59
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60
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61
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```
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