Given n email addresses of different domains, please send an email to the first address(in alphabetical order) of each domain.

arach_ques2.java

// Given n email addresses of different domains, please send an email to the first address(in alphabetical order) of each domain.
//   Please assume a function sendmail() to send the emails.A sample email array is following 
//   {ghi@hotmail.com, def@yahoo.com, ghi@gmail.com, abc@channelier.com, abc@hotmail.com, def@hotmail.com, abc@gmail.com, 
//   abc@yahoo.com, def@channelier.com,jkl@hotmail.com, ghi@yahoo.com, def@gmail.com }
import java.util.*;  

void sendMail(String arr[])
{
  Arrays.sort(arr);
  List<String> emailList = new ArrayList<>();
  Collections.addAll(emailList,arr);
  
  for(int i=0 ; i<emailList.size() ; i++)
  {
    String hostMail = emailList.get(i);
    String hostDomain = hostMail.substring(hostMail.indexOf('@'));
    sendmail(hostMail);
    for(int j=0 ; j<l ; j++)
    {
      String subMail = emailList.get(j);
      String subDomain = subMail.substring(subMail.indexOf('@'));
      if(subDomain.equalsToIgnoreCase(hostDomain))
        emailList.remove(j);
    } 
  }
}