프로그래밍 연구소

import java.util.ArrayList; public class Main { public static void main(String[] args) { /* List */ ArrayList a = new ArrayList(); a.add(1); a.add(2); a.add("Hello"); System. out.println(a ); }}

import java.lang.reflect.Array; public class Main { public static void main(String[] args) { /* Array */ Integer[] a = {1,2,3,4}; // Array Type //Integer a[] = {1,2,3,4}; // Array Type System. out.println(a ); System. out.println(a [1]); }}

public class Main { public static void main(String[] args) { /* 배열 선언 */ int[] arr = {1,2,3,4}; System. out.println(arr .getClass()); }}