java中的list,set,数组之间的转换

使用该工具类import org.apache.commons.collections.CollectionUtils; 在Apache Jakarta Commons Collections中

　　String[] strArray = { "aaa", "bbb", "ccc", "bbb" };
        List<String> strList = new ArrayList<String>();
        Set<String> strSet = new HashSet<String>();
        CollectionUtils.addAll(strList, strArray);
        CollectionUtils.addAll(strSet, strArray);

for (int i = 0; i < strList.size(); i++) {
            System.out.println(strList.get(i));
        }
        System.out.println("==========");

for (String string : strSet) {
            System.out.println(string);
        }

输出的结果为

aaa
bbb
ccc
bbb
==========
aaa
ccc
bbb

★ List和Set转换
List list = new ArrayList(new Hashset());
List list = Arrays.asList(array)
list list = new LinkedList(Arrays.asList(array));
Set set = new HashSet(Arrays.asList(array));

set转换成list

List list = new ArrayList<>(set);