Array轉List

String[] s = new String[]{"A", "B", "C", "D","E"};List<String> list = Arrays.asList(s);

值得注意的是上邊轉換過來的List並不是java.util.ArrayList，而是java.util.Arrays#ArrayList，這個使用的時候要注意下。

String[] dest = list.toArray(new String[0]);//new String[0]是指定返回陣列的型別System.out.println("dest: " + Arrays.toString(dest));

Set<String> set = new HashSet<>(list);

List<String> list_1 = new ArrayList<>(set);

s = new String[]{"A", "B", "C", "D","E"};set = new HashSet<>(Arrays.asList(s));

dest = set.toArray(new String[0]);