路过的大神进来帮帮小弟 愁啊

我的代码：
import java.util.*;

public class Main {

    user xmFC = new user(1);
    ArrayList<user> fc = xmFC.friendList;
   
    public static void main(String[] args) throws Exception{
        Main friendCircle = new Main();
        Scanner cin = new Scanner(System.in);
        int m = cin.nextInt();
        if(m>=1000){System.exit(0);}
        for(int i=2;i<=m;i++){
            friendCircle.addFriend(i);
        }
        int n = cin.nextInt();
        for(int i=0;i<n;i++){
            int a = cin.nextInt();
            if(a>m){System.exit(0);}
            int b = cin.nextInt();
            if(b>m){System.exit(0);}
            friendCircle.isFriend(a, b);
        }
        int w = cin.nextInt();
        for(int i=0;i<w;i++){
            int u = cin.nextInt();
            if(u>m){System.exit(0);}
            int uc = cin.nextInt();
            if(uc>=1000){System.exit(0);}
            (u, uc);
        }   
        
           int rId = cin.nextInt();
           if(rId ==1){
               friendCircle.xmFC.readComment();
           }else{
           friendCircle.read(rId);}
           cin.close();
    }

    public void addFriend(int userId){
        user friend = new user(userId);
        xmFC.beFriend(friend);
        friend.beFriend(xmFC);
    }
   
    public void isFriend(int a,int b){
        fc.get(a-1).beFriend(fc.get(b-1));
        fc.get(b-1).beFriend(fc.get(a-1));
    }
   
    public void comment(int u,int uc){
        fc.get(u-1).comment(uc);
    }
   
    public void read(int rId){
                fc.get(rId-1).readComment();            
    }
}





class user {

    int id ;
    ArrayList<Integer> cIds = new ArrayList<Integer>();
    boolean hasComment;
    ArrayList<user> friendList = new ArrayList<user>();
   
    public user(int userId) {
        this.id = userId;
        friendList.add(this);
    }

    public void beFriend(user b){
        if(!this.friendList.contains(b)){
            friendList.add(b);
        }
    }
   
    public void comment(int cId){
        this.cIds.add(cId);
        this.hasComment = true;
    }

    public void readComment() {
        for(int i=0;i<friendList.size();i++){
            user readUF =  friendList.get(i);
                if(readUF.hasComment){
                    int fid = readUF.id;
                    for(int j=0;j<readUF.cIds.size();j++){
                        int fcId = readUF.cIds.get(j);
                        System.out.print(String.format("%1$8d", fid));
                        System.out.println(String.format("%1$8d", fcId));
                    }
                }
            
        }
        
    }
}

给一个失败的测试用例就行啊啊啊啊 帮帮忙啊 头疼