Как создать immutable класс java — Q&A Хекслет
2026-02-26 19:50 Diff
https://ru.hexlet.io/qna/java/questions/kak-sozdat-immutable-klass-java
import java.util.ArrayList; import java.util.List; final class ImmutableList { private List<String> list; ImmutableList(List<String> listValue) { list = new ArrayList<>(); for(String item : listValue) { list.add(item); } } public List<String> getList() { List<String> listValue = new ArrayList<>(); for(String item : list) { listValue.add(item); } return listValue; } } public class App { public static void main(String[] args) { List<String> list = new ArrayList<>(List.of("1", "2", "3")); ImmutableList immutableList = new ImmutableList(list); list.add("4"); System.out.println(list); // => [1, 2, 3, 4] System.out.println(immutableList.getList()); // => [1, 2, 3] List<String> testList = immutableList.getList(); testList.add("5"); System.out.println(testList); // => [1, 2, 3, 5] System.out.println(immutableList.getList()); // => [1, 2, 3] } }