java实现简单LinkedList

package LinkedListClass;

public class Node {
    Node parents;
    Object myself;
    Node child;

    public Node() {

    }

    public Node(Node parents, Object myself, Node child) {
        super();
        this.parents = parents;
        this.myself = myself;
        this.child = child;
    }

    public Node getParents() {
        return parents;
    }

    public void setParents(Node parents) {
        this.parents = parents;
    }

    public Object getMyself() {
        return myself;
    }

    public void setMyself(Object myself) {
        this.myself = myself;
    }

    public Node getChild() {
        return child;
    }

    public void setChild(Node child) {
        this.child = child;
    }

}

public class MyLinkedList {
    private Node first;
    private Node last;
    private int size;

    public void add(Object obj) {
        Node n = new Node();
        if (first == null) {
            n.setChild(null);
            n.setMyself(obj);
            n.setParents(null);
            first = n;
            last = n;
        } else {
            n.setParents(last);
            n.setMyself(obj);
            n.setChild(null);

            last.setChild(n);
            last = n;
        }
        size++;
    }

    public int size() {
        return size;
    }

    public Object get(int index) {
        Node temp = null;
        if (first != null) {
            temp = first;
            for (int i = 0; i < index; i++) {
                temp = temp.child;
            }
        }
        return temp.myself;
    }

    public static void main(String[] args) {
        MyLinkedList list = new MyLinkedList();
        list.add("aaa");
        list.add("bbb");
        list.add("ccc");
        list.add("ddd");
        System.out.println(list.get(3));
        System.out.println(list.size());
    }
}