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Javaで文字列を整数・小数に変換(データのキャスト)するメソッドについて

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##データ型の変換(データのキャスト)

####文字列等→整数・小数への変換

・整数へ変換するメソッド
Integer.parseInt(変数名);

・小数へ変換するメソッド
Double.parseDouble(変数名);

String text = "123"

System.out.println(text);  // 123 (文字列としてのそのまま出力)
System.out.println(Integer.parseInt(text)); // 123 (整数に変換)
System.out.println(Double.parseDouble(text)); // 123.0 (小数に変換)
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