排序题

题目描述

题目在此处查看

题解

方法1

• sort方法进行排序

public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        //在此输入您的代码...
        int N = scan.nextInt();
        ArrayList<Integer> arr = new ArrayList<>();

        for (int i = 0; i < N; i++) {
            arr.add(scan.nextInt());
        }

        arr.sort((o1, o2) -> o1-o2); // 升序
        for (int i = 0; i < N; i++) {
            System.out.print(arr.get(i)+" ");
        }

        System.out.println();

        arr.sort((o1, o2) -> o2-o1); // 降序
        for (int i = 0; i < N; i++) {
            System.out.print(arr.get(i)+" ");
        }

        scan.close();
    }
}