题解 | #提取不重复的整数#

import java.util.Scanner;
import java.util.*;
// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        while (sc.hasNext()) {
            int target = sc.nextInt();

            String nums = String.valueOf(target);

            char[] cha = nums.toCharArray();

            ArrayList ali = new ArrayList();

            for (char c : cha) {
                ali.add(c);
            }

            Collections.reverse(ali);

            LinkedHashSet lhs = new LinkedHashSet();

            for (Object a : ali) {
                lhs.add(a);
            }

            for(Object l : lhs){
                System.out.print(l);
            }

        }

    }
}

解题步骤

(1)先将数字转为字符型数组

(2)然后存入ArrayList进行翻转

(3)最后使用LinkedHashSet进行去重复