> import java.util.ArrayList;
> import java.util.List;
> import java.util.Map;
> import java.util.HashMap;
> import java.util.Scanner;
> import java.util.Comparator;
> import java.util.Collections;
> 
> /**
>  * @author lvgang
>  * @descript
>  * @time 2019-01-16 14:29
>  */
> public class Main {
> 
>     public static void main(String[] args){
>         Scanner scanner = new Scanner(System.in);
>         int n = Integer.parseInt(scanner.nextLine());
> //        Map<String,Integer> map = new HashMap<>(16);
> //        List<String> keys = new ArrayList<>(16);
>         Map<String,Integer> map = new HashMap<String, Integer>(16);
>         List<String> keys = new ArrayList<String>(16);
>         while (n>0){
>             String value = scanner.nextLine();
>             /**
>              * 映射
>              */
>             String code = value;
>             code=code.replaceAll("A","2");
>             code=code.replaceAll("B","2");
>             code=code.replaceAll("C","2");
>             code=code.replaceAll("D","3");
>             code=code.replaceAll("E","3");
>             code=code.replaceAll("F","3");
>             code=code.replaceAll("G","4");
>             code=code.replaceAll("H","4");
>             code=code.replaceAll("I","4");
>             code=code.replaceAll("J","5");
>             code=code.replaceAll("K","5");
>             code=code.replaceAll("L","5");
>             code=code.replaceAll("M","6");
>             code=code.replaceAll("N","6");
>             code=code.replaceAll("O","6");
>             code=code.replaceAll("P","7");
>             code=code.replaceAll("R","7");
>             code=code.replaceAll("S","7");
>             code=code.replaceAll("T","8");
>             code=code.replaceAll("U","8");
>             code=code.replaceAll("V","8");
>             code=code.replaceAll("W","9");
>             code=code.replaceAll("X","9");
>             code=code.replaceAll("Y","9");
>             /**
>              * 消除- 和 空格
>              */
>             code=code.replaceAll("-","");
>             code=code.replaceAll(" ","");
>             /**
>              * 添加-
>              */
>             if(code.length()==7){
>                 n--;
>                 //code=code.substring(0,2)+"-"+code.substring(2);
>                 if(map.get(code)==null){
>                     map.put(code,1);
>                 }else {
>                     map.put(code,map.get(code)+1);
>                     if(map.get(code)==2){
>                         keys.add(code);
>                     }
>                 }
>             }
>         }
>         Collections.sort(keys, new Comparator<String>() {
>             @Override
>             public int compare(String o1, String o2) {
>                 return o1.compareTo(o2);
>             }
>         });
>         for(int i=0;i<keys.size();i++){
>             System.out.println(keys.get(i).substring(0,2)+"-"+keys.get(i).substring(2)+" "+map.get(keys.get(i)));
>         }
> 
>     }
> }

没有这个吧：

如果输入数据中没有重复的号码，输出一行： 
No duplicates.