배열/ArrayList

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;

public class ArrayDemo {
    public static void main(String[] args) {
        // 배열
        int[] arr = {5, 3, 1, 4, 2};
        Arrays.sort(arr);
        System.out.println(Arrays.toString(arr));  // [1, 2, 3, 4, 5]

        // ArrayList
        ArrayList<String> list = new ArrayList<>();
        list.add("React");
        list.add("Vue");
        list.add("Angular");

        Collections.sort(list);
        System.out.println(list);         // [Angular, React, Vue]
        System.out.println(list.size());  // 3
        list.remove("Vue");
        System.out.println(list.contains("React")); // true

        // for-each
        for (String s : list) {
            System.out.println(s);
        }
    }
}