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【Java】String型配列の要素一つをInt型に型変換する方法

Last updated at Posted at 2020-09-24

例えば従業員の情報を、名前、年齢と入力されそれを一つの配列にScannerを使って代入すると
yamada 20

  Scanner sc = new Scanner( System.in);
  String[] employee = sc.nextLine();

となるが、javaは静的型付のため配列内の名前も年齢もString型となる
年齢をInt型にキャスト(型変換)しなくてはならない
そこでInteger.parseIntメソッドを使う

 int age = Integer.parseInt( employee[1] );

これでString型からInt型へのキャストは終了
たとえば1歳年を増やしたければ

 int addAge = Integer.parseInt( employee[1] ) + 1;

となる。
()内は引数なのでもちろん普通の変数でも問題ありません。

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