Method append

demos/java/src/app/App.java:20–30

(T value)

    private Node<T> head;

    public void append(T value) {
        if (head == null) {
            head = new Node<T>(value);
        } else {
            Node<T> m = head;
            while (m.next != null) {
                m = m.next;
            }
            m.next = new Node<T>(value);
        }
    }

    public String visualize() {
        Node<T> list = new Node<T>(null);