From Array to List
1 2 | Integer[] numArray = {1,2,3,4,5}; List<Integer> numList = Arrays.asList(numArray); | cs |
From List to Array
1 2 3 4 5 6 | List<Integer> numList = new ArrayList<Integer>(); numList.add(1); numList.add(2); numList.add(3); numList.add(4); numArray = numList.toArray(new Integer[numList.size()]); | cs |
From Array to ArrayList
1 2 | Integer[] numArray = {1,2,3,4,5}; ArrayList<Integer> numList = new ArrayList<Integer>(Arrays.asList(numArray)); | cs |
1 2 | int[] numArray = {1,2,3,4,5}; ArrayList<Integer> numList = new ArrayList<Integer>(Arrays.stream(numArray).boxed().collect(Collectors.toList())); | cs |
1 2 3 | //String -> ArrayList<Character> String s = "test"; ArrayList<Character> ss = new ArrayList<Character>(s.chars().mapToObj(x -> (char)x).collect(Collectors.toList())); | cs |
'CODING > JAVA + Spring + JSP' 카테고리의 다른 글
Ubuntu 에 Java 19 설치 (0) | 2023.12.20 |
---|---|
2017_9_22_JAVA_EE_ArrayList에_for_문으로_객체를_넣을_때의_주의사항 (0) | 2017.09.22 |