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【Java】配列からListへの変換

Last updated at Posted at 2019-08-11

配列からListへ変換をしたい

public static void main(String[] args) {

    String arr[] = {"orange","apple","cherry","melon","grape"};
    List<String> list = Arrays.asList(arr);

arrを引数にしたArrays.asListをlistに代入

要素数を追加したい場合

NG例

    List<String> list = Arrays.asList(arr);
    list.add("banana");

(原因)Arrays.asList()は追加や削除といったListのメソッドの操作を受け付けない

OK例

    List<String> list = Arrays.asList(arr);
    List<String> list2 = new ArrayList<>(list);
    list2.add("banana");

listをArrayListの引数にしてlist2に代入
上記を簡潔に書くと

    List<String> list = new ArrayList<>(Arrays.asList(arr));
    list.add("banana");

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