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[Java]String型の配列をint型の配列に変換する

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はじめに

ネット上のスキルチェック問題などを解いていてよく出くわすのでメモがわりに。

問題

"123456"

という文字列型の数値の入力を

[1, 2, 3, 4, 5, 6]

と、数値型の配列に変換する。

解決方法

// 問題で与えられる入力
String input = "123456";

// Stringの文字列で入力を受け取る
String[] strArr = input.split("");

// int型の配列に変換
int[] numArr = Stream.of(strArr).mapToInt(Integer::parseInt).toArray();

System.out.println(Arrays.toString(numArr));  // [1,2,3,4,5,6]

おわりに

streamは中間処理をよく忘れるのでメモメモ。

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