使用java实现单链表----（java中的引用就是指针）

//一直以为java中没有指针，其实java的引用就是指针，只不过堆栈中的引用储存了在堆中的地址，可以看做java中的指针。
public class sibgleLink<E> {
	// 结点内部类
	private class Node {
		private Object data;
		private Node next = null;

		public Node() {
			data = null;
		}

		// 带数据的构造函数
		public Node(E data) {
			this.data = data;
		}

	}

	private Node head; // 头引用（指针）
	private Node rear; // 尾引用（指针）
	private Node point; // 临时引用（指针）
	private int length = 1; // 链表长度

	// 带参数的构造函数
	public sibgleLink(E e) {
		head = new Node();
		head.data = e;
		rear = head;
		length = 1;
	}

	// 尾插法
	public void add(E elem) {
		point = new Node(elem);
		rear.next = point;
		rear = point;
		length++;

	}

	// 遍历节点
	public void traverse() {
		point = head; // 移动临时引用到头结点
		if (head != null)
			System.out.print("[" + head.data + "]");
		while (point.next != null) {
			System.out.print("->[" + point.next.data + "]");
			point = point.next;
		}
		System.out.println();
	}

	// 返回长度
	public int length() {
		return this.length;
	}

	// 清除
	public boolean clear() {
		while (head.next.next != null) {

			head.next = head.next.next;
		}

		head.next = null;
		rear = head;
		point = null;
		length = 1;
		return true;

	}

	// 插入元素
	public boolean insert(int x, E data) {
		// 工作节点
		point = head;
		int wz = 1;
		if (x == 1) {
			Node n = new Node(data);
			n.next = head;
			head = n;
			length++;
			return true;

		}

		if (x < 1 || x > this.length) {
			return false;

		} else {

			while (point.next != null && wz < x - 1) {
				point = point.next;
				wz++;
			}

			// 放入一个节点
			Node n = new Node(data);
			n.next = point.next;
			point.next = n;
			length++;

			return true;

		}

	}

	// 删除
	public boolean del(int x) {
		point = head;
		int wz = 1;
		if (x < 0 || x > length) {
			return false;

		} else if (x == length) {
			point = head;
			while (point.next != null) {
				point = rear;
				point.next = null;
				length--;

			}

		} else {

			while (point.next != null && wz < x - 1) {
				point = point.next;
				wz++;
			}
			Node d = point.next;
			point.next = point.next.next;
			d = null;

			return true;

		}

		return false;

	}

	// 更改
	public boolean change(int x, E data) {
		point = head;
		int wz = 1;
		if (x < 0 || x > length) {
			return false;

		} else {

			while (point.next != null && wz < x) {
				point = point.next;
				wz++;
			}
			point.data = data;

			return true;

		}

	}

	// 移动指针
	private Node movePoint(int position) {
		if (position < 0)
			return head;
		if (position > length)
			return rear;

		if (position >= 0 && position <= length) {
			point = head;
			while (point != null) {
				if (position == 0)
					break;
				position--;
				point = point.next;
			}
		}

		return point;

	}

	public E find(int position) {
		if (position >= 0 && position < length) {
			Node tmp = movePoint(position);
			return (E) tmp.next.data;
		}
		return null;
	}

	// test
	public static void main(String[] args) {

		sibgleLink<Integer> si = new sibgleLink<Integer>(0);
		si.add(5);
		si.add(6);
		si.insert(2, 2);
		si.traverse();
		si.del(3);
		si.traverse();
		si.change(3, 77);
		si.traverse();
		System.out.println(si.length());

	}

}

　　结果：

[0]->[2]->[5]->[6]
[0]->[2]->[6]
[0]->[2]->[77]
4