import java.util.*;public class TestListSet{public static void main(String args[]) {List list = new ArrayList();list.add(“Hello”);list.add(“Learn”);list.add(“Hello”);list.add(“Welcome”);Set set = new HashSet();set.addAll(list);System.out.println(set.size());}}程序输出为
发布时间:2024-03-31 20:53:20