回答編集履歴
2
リンクの追加
answer
CHANGED
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@@ -46,4 +46,11 @@
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46
46
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**実行結果** [Wandbox](https://wandbox.org/permlink/mdql7gB4guBIgUvl)
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47
47
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```
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48
48
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[1, 2, 3, 4, 5, 6, 7, 8, 9]
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49
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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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+
参考
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52
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+
---
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53
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+
安定の公式リファレンス。
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54
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+
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55
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+
- [Stream (Java SE 13 & JDK 13 )](https://docs.oracle.com/javase/jp/13/docs/api/java.base/java/util/stream/Stream.html)
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56
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+
- [IntStream (Java SE 13 & JDK 13 )](https://docs.oracle.com/javase/jp/13/docs/api/java.base/java/util/stream/IntStream.html)
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1
追記
answer
CHANGED
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@@ -21,4 +21,29 @@
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21
21
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**実行結果** [Wandbox](https://wandbox.org/permlink/suoFynUMjA0f1d3M)
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22
22
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```
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23
23
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[1, 2, 3, 4, 5, 6]
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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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+
案2
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|
27
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+
---
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|
28
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+
ちょっと読みづらいですけど、任意個数の結合にも対応できる例。
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29
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+
```Java
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30
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+
import java.util.*;
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31
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+
import java.util.stream.*;
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|
32
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+
|
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33
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+
class Main {
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|
34
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+
static int[] concat(int[]... arrs) {
|
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35
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+
return Stream.of(arrs).flatMapToInt(IntStream::of).toArray();
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36
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+
}
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37
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+
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38
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+
public static void main(String[] args) {
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|
39
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+
System.out.println(Arrays.toString(
|
|
40
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+
concat(new int[]{1, 2, 3}, new int[]{4, 5, 6}, new int[]{7, 8, 9})
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|
41
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+
));
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42
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+
}
|
|
43
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+
}
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|
44
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+
```
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|
45
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+
|
|
46
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+
**実行結果** [Wandbox](https://wandbox.org/permlink/mdql7gB4guBIgUvl)
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|
47
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+
```
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|
48
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+
[1, 2, 3, 4, 5, 6, 7, 8, 9]
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24
49
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```
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