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Array转List：

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

注意这里list里面的元素直接是s里面的元素( list backed by the specified array)，换句话就是说：对s的修改，直接影响list。


List转Array：

String[] dest = list.toArray(new String[0]);//new String[0]是指定返回数组的类型
System.out.println("dest: " + Arrays.toString(dest));
注意这里的dest里面的元素不是list里面的元素，换句话就是说：对list中关于元素的修改，不会影响dest

List、Set互转：

//List转Set
Set<String> set = new HashSet<>(list);
System.out.println("set: " + set);
//Set转List
List<String> list_1 = new ArrayList<>(set);
System.out.println("list_1: " + list_1);

注意：和toArray()一样，被转换的List(Set)的修改不会对被转化后的Set（List）造成影响


Array、Set互转：

//array转set
s = new String[]{"A", "B", "C", "D","E"};
set = new HashSet<>(Arrays.asList(s));
System.out.println("set: " + set);
//set转array
dest = set.toArray(new String[0]);
System.out.println("dest: " + Arrays.toString(dest));