List to Array, Array to List 변환

1. String list to array

arrayList.toArray(new String[0]);

 

2. String array to list

ArrayList<String> arrayList = new ArrayList<>(Arrays.asList(array));

 

3. Integer list to int array

arrayList.stream().mapToInt(Integer::intValue).toArray();

 

4. int array to Integer list

List<Integer> list = Arrays.stream(intArray).boxed().collect(Collectors.toList());

ArrayList<Integer> integerArray = (ArrayList<Integer>) Arrays.stream(intArray).boxed().collect(Collectors.toList());