使用List.of()方法创建的列表实例具有以下特点。
List.of(E... elements)
import java.util.List; public class UnmodifiedListTest { public static void main(String[] args) { List<String> countries = List.of("India", "Australia", "England", "Newzealand"); System.out.println("Countries - " + countries); countries.add("Srilanka"); // throws UnsupportedOperationException } }
Countries - [India, Australia, England, Newzealand] Exception in thread "main" java.lang.UnsupportedOperationException at java.base/java.util.ImmutableCollections.uoe(Unknown Source) at java.base/java.util.ImmutableCollections$AbstractImmutableList.add(Unknown Source) at UnmodifiedListTest.main(UnmodifiedListTest.java:7)
以上就是在Java 9中,我们如何创建一个不可修改的列表?的详细内容,更多请关注php中文网其它相关文章!
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