单链表java简易实现

package com.shine.test.datastruct;

/**
 * 简易链表
 * 
 * @author SHINE
 *
 * @param <E>
 */
public class LinkList<E> {

	private Node head, tail;
	private int size = 0;

	protected class Node<E> {
		E data;
		Node next;
	}

	public LinkList() {
		head = new Node();
		head.next = null;
		tail = new Node<E>();
	}

	public void insert(E e, int index) {
		Node newNode = new Node<E>();
		newNode.data = e;

		Node before = head;
		Node temp = head.next;
		while (index >= 0) {
			if (index == 0) {
				before.next = newNode;
				newNode.next = temp;
				size++;
				break;
			}
			before = temp;
			temp = temp.next;
			index--;
		}
	}

	public void add(E e) {
		Node node = new Node();
		node.data = e;
		node.next = null;
		if (head.next == null) {
			head.next = node;
		}
		tail.next = node;
		tail = node;
		size++;
	}

	public E get(int index) {
		if (index > size - 1) {
			return null;
		}
		Node temp = head.next;
		while (index >= 0) {
			if (index == 0) {
				return (E) temp.data;

			}
			temp = temp.next;
			index--;
		}
		return null;
	}

	public E getFirst() {
		return get(0);
	}

	public E getLast() {
		return get(size - 1);
	}

	public void remove(E e) {
		Node before = head;
		Node temp = head.next;
		while (temp != null) {
			if (temp.data.equals(e)) {
				before.next = temp.next;
				size--;
				break;
			}
			before = temp;
			temp = temp.next;
		}
	}

	@Override
	public String toString() {
		StringBuffer sb = new StringBuffer();
		Node temp = head.next;
		while (temp != null) {
			sb.append(temp.data + "->");
			temp = temp.next;
		}
		return sb.toString();
	}

	public int getLength() {
		return size;
	}
}