题解 | #明明的随机数#

主要是集合的判断元素和排序，还有就是addAll方法

import java.util.*;
public class Main {
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        ArrayList<Integer> list=  new ArrayList<Integer>(); 
        ArrayList<Integer> result = new ArrayList<Integer>();

        while (in.hasNextInt()){
            int n = in.nextInt();
            for (int i = 0 ;i< n;i++){
                int v = in.nextInt();
                if (!list.contains(v))
                {
                    list.add(v);
                }
            }
            list.sort(new Comparator<Integer>(){
                            @Override
                            public int compare(Integer arg0 , Integer arg1 ) {
                                return arg0.compareTo(arg1); //这是顺序
                            }   
                         });
            result.addAll(list);
            list.clear();
        }

        for(Integer v :result){
            System.out.println(v);
        }
    }
}