回答編集履歴
2
リンクの追加
test
CHANGED
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@@ -95,3 +95,17 @@
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95
95
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[1, 2, 3, 4, 5, 6, 7, 8, 9]
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96
96
|
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97
97
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```
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98
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+
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99
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+
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100
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+
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101
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+
参考
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102
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+
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103
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+
---
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104
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+
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105
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+
安定の公式リファレンス。
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106
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+
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107
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+
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108
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+
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109
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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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110
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+
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111
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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
test
CHANGED
|
@@ -45,3 +45,53 @@
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45
45
|
[1, 2, 3, 4, 5, 6]
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46
46
|
|
|
47
47
|
```
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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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+
案2
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52
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+
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|
53
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+
---
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|
54
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+
|
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55
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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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|
56
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+
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57
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+
```Java
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|
58
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+
|
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59
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+
import java.util.*;
|
|
60
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+
|
|
61
|
+
import java.util.stream.*;
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|
62
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+
|
|
63
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+
|
|
64
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+
|
|
65
|
+
class Main {
|
|
66
|
+
|
|
67
|
+
static int[] concat(int[]... arrs) {
|
|
68
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+
|
|
69
|
+
return Stream.of(arrs).flatMapToInt(IntStream::of).toArray();
|
|
70
|
+
|
|
71
|
+
}
|
|
72
|
+
|
|
73
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+
|
|
74
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+
|
|
75
|
+
public static void main(String[] args) {
|
|
76
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+
|
|
77
|
+
System.out.println(Arrays.toString(
|
|
78
|
+
|
|
79
|
+
concat(new int[]{1, 2, 3}, new int[]{4, 5, 6}, new int[]{7, 8, 9})
|
|
80
|
+
|
|
81
|
+
));
|
|
82
|
+
|
|
83
|
+
}
|
|
84
|
+
|
|
85
|
+
}
|
|
86
|
+
|
|
87
|
+
```
|
|
88
|
+
|
|
89
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+
|
|
90
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+
|
|
91
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+
**実行結果** [Wandbox](https://wandbox.org/permlink/mdql7gB4guBIgUvl)
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|
92
|
+
|
|
93
|
+
```
|
|
94
|
+
|
|
95
|
+
[1, 2, 3, 4, 5, 6, 7, 8, 9]
|
|
96
|
+
|
|
97
|
+
```
|