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 =newArrayList<>(set);