whats wrong ???

public class Solution {
    public static void main(String[] args) throws Exception {
        //在此编写你的代码
        String a="",b="";
        Scanner sc = new Scanner(System.in);
        if(sc.hasNext()) a=sc.nextLine();
        if(sc.hasNext()) b=sc.nextLine();

        if(a.equals(b))
            System.out.println("名字相同");
        else if(a.length()==b.length())
                System.out.println("名字长度相同");

    }
}

BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
   String s1 = reader.readLine();
   String s2 = reader.readLine();

   if(s1.equals(s2))
       System.out.println("名字相同");
   else if(s1.length() == s2.length())
       System.out.println("名字长度相同");