linked list - Java Print Everything in Queue Using LinkedList and The Deque Interfaces -

i'm little stuck here, need helpm here's code:

import java.util.*; import java.util.iterator;      class customer {        public string lastname;        public string firstname;        public customer() {        }        public customer(string last, string first) {           this.lastname = last;           this.firstname = first;        }        public string tostring() {           return firstname + " " + lastname;        }     }     class hourlycustomer extends customer {        public double hourlyrate;        public hourlycustomer(string last, string first) {           super(last, first);        }     }  class genqueue<e> {    private linkedlist<e> list = new linkedlist<e>();    public listiterator<e> iterator = list.listiterator();    public void enqueue(e item) {       list.addlast(item);    }    public e dequeue() {       return list.poll();    }    public e show(){        return list.peek();    }    public void printqueueelements(){     }    public e isnotend(){        return list.getlast();    }    public boolean hasitems() {       return !list.isempty();    }    public boolean isempty()    {        return list.isempty();    }    public iterator<e>   iterator()    {     return iterator;           }      public e removefirst(){        return list.removefirst();    }    public e getfirst(){        return list.getfirst();    }    public int size() {       return list.size();    }     public boolean hasnext()    {     return false;     }       public void additems(genqueue<? extends e> q) {        while (q.hasnext()) list.addlast(q.dequeue());    }   }      public class jerald {      public static void main(string[] args){            scanner sc = new scanner(system.in);         string input1;         string input2;         int choice = 1000;             genqueue<customer> emplist;         emplist = new genqueue<customer>();         genqueue<hourlycustomer> hlist;         hlist = new genqueue<hourlycustomer>();            while(true){          do{              system.out.println("================");             system.out.println("queue operations menu");             system.out.println("================");             system.out.println("1,enquene");             system.out.println("2,dequeue");             system.out.println("0, quit\n");             system.out.println("enter choice:");             try{                  choice = sc.nextint();                    switch(choice){                 case 1:                      do{                       system.out.println("\nplease enter last name:  ");                     input1 = sc.next();                     system.out.println("\nplease enter first name:  ");                     input2 = sc.next();                     hlist.enqueue(new hourlycustomer(input1, input2));                     emplist.additems(hlist);                      system.out.println("\n"+(input2 + " " +  input1) + " successful queued");                      system.out.println("\ndo still want enqueue?<1> or want view in queue?<0> or \nback main menu dequeueing?<menu>: ");                     choice = sc.nextint();                      }while (choice != 0);                         system.out.println("\nthe customers' names are: \n");                       int numberofelements = emplist.size();                          (int = 0; < numberofelements; i++) {                        customer emp = emplist.dequeue();                        system.out.println(emp.firstname + " " + emp.lastname + "\n");                        emplist.enqueue(emp);                      }                       break;                       case 2:                       if (emplist.isempty()) {                         system.out.println("the queue empty!");                     }                     else                     {                     system.out.println("\ndequeued customer: "  +emplist.getfirst());                     emplist.removefirst();                     }                      if (emplist.isempty()) {                         system.out.println("the queue empty!");                     }                     else                     {                     system.out.println("\nnext customer in queue: "  +emplist.getfirst()+"\n");                 }                      break;                  case 0:                      system.exit(0);                    default:                         system.out.println("invalid choice");                 }              }              catch(inputmismatchexception e){                 system.out.println("please enter 1-5, 0 quit");                 sc.nextline();             }          }while(choice != 0);         }     } } 

look @ case 1, in loop im trying print have been saved in queue. dont see errors unfortuantely when run it,after getting users input, ending do-while loop, doesnt print whats inside queue. problem method? in deque methods have tested poll() element() , peek() bu didnt either. anyway i'm stuck here , cant move forward, don't know problem is, reread , reread code think flowing enough. thoughts on this? how fix it? asked question after trying fix error no luck. please share thoughts , fix.

i think loop in line 155, in case 1, giving wrong output. thoughts?

by way i'm doing in case 2, dequeueing,

the problem when calling additems method:

 emplist.additems(hlist); 

i don't know why hasnext method used additems returning false? not make sense, need modify logic inside it. result of being false, code inside while loop never called.

public void additems(genqueue<? extends e> q) {       while (q.hasnext()) list.addlast(q.dequeue()); }