employeeList1 // data present
employeeList2 // data present
ListIterator<Employee> zeroList=employeeList2.listIterator();

//remove employee if already present in list1
while(zeroList.hasNext()){
for(Employee employee : employeeList1){
                    if(zeroList.next().getID().equals(employee.getId())){
zeroList.remove();
                    }
                }
            }

java.util.NoSuchElementException

List<String> list1 = new ArrayList<>();
list1.add("a");
list1.add("b");
list1.add("c");
List<String> list2 = new ArrayList<>();
list2.add("a");
list2.add("p");
list2.add("q");
list2.removeAll(list1);
System.out.println(list2);

[p, q]