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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 |
import java.util.*; public class Main { public static void main(String[] args) throws Exception { List<Integer> list = getList(); // list.add("え"); // error: incompatible types list.add(4); System.out.println(list); } public static List getList() { List<String> list = new ArrayList<>(); list.add("あ"); list.add("い"); list.add("う"); return list; } } |
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1 |
[あ, い, う, 4] |
