回答編集履歴
2
appendだけで書いたパターンを追加
test
CHANGED
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@@ -21,3 +21,31 @@
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21
21
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最初に"~"を確定させておき、fromがあれば先頭に足す形にしてみた
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22
22
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23
23
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後、StringBuilderのコンストラクタに空文字を渡すのは無駄です。
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24
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+
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25
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+
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26
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+
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27
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+
追記
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28
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+
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29
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せっかく両方nullの可能性を最初に排除したのにそれを生かすのを忘れてた
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30
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+
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31
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+
```java
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32
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+
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33
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+
public String getNumberOfPeople(boolean check, Integer from, Integer to) {
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34
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+
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35
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if (!check) return "";
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36
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+
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37
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if (from == null && to == null) throw new IllegalArgumentException();
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38
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39
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StringBuilder builder = new StringBuilder();
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40
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+
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41
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if (from != null) builder.append(from).appemd("人");
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42
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+
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43
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builder.append("~");
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44
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+
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45
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if (to != null) builder.append(to).append("人");
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46
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+
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47
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return builder.toString();
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48
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+
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49
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}
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50
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+
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51
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```
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1
前半の"人"n
test
CHANGED
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@@ -8,7 +8,7 @@
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8
8
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9
9
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StringBuilder builder = new StringBuilder("~");
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10
10
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11
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-
if (from != null) builder.insert(0, from)
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11
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+
if (from != null) builder.insert(0, "人").insert(0, from);
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12
12
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13
13
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if (to != null) builder.append(to).append("人");
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14
14
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