Initialization of other types of collections in Java

//List of Double
List<Double> doubleList = new ArrayList<Double>();
doubleList.add(41.13);
doubleList.add(37.5);

//Stack of string
Stack<String> stringStack = new Stack<String>();
stringStack.push("one");
stringStack.push("two");

//Queue of Employee
Queue<Employee> employeeQueue = new LinkedList<Employee>();
employeeQueue.add(new Employee("Anton", "Pavlov"));