题解 | #竞选社长#

import java.util.Arrays;
import java.util.Collections;
import java.util.Scanner;

public class Main {
	//  2、Collections逆置
    public static void main(String[] args) {
        int[] arr = new int[6];

        // ArrayList<Integer>
        ArrayList<Integer> list = new ArrayList<>();

        Scanner scanner = new Scanner(System.in);
        for (int i = 0; i < arr.length; i++) {
            arr[i] = scanner.nextInt();
            list.add(arr[i]);
        }
        System.out.println(Arrays.toString(arr));

        // Collections逆置
        Collections.reverse(list);
        System.out.println(list);
    }
    
    // 1、遍历数组 交换
    public static void main1(String[] args) {
        int[] arr = new int[6];

        Scanner scanner = new Scanner(System.in);
        for (int i = 0; i < arr.length; i++) {
            arr[i] = scanner.nextInt();
        }
        System.out.println(Arrays.toString(arr));

        for (int i = 0; i < arr.length / 2; i++) { // 前一半 与 后一半 交换
            int tmp = arr[i];
            arr[i] = arr[arr.length-1-i];
            arr[arr.length-1-i] = tmp;
        }
        System.out.println(Arrays.toString(arr));
    }
}