java 实现自定义链表

1.链表结构

  链表是链式的结构


2.链表的组成

   链表是由头节点,中间节点和尾节点组成

   节点是由两个部分组成:

      1.数据域
      2.引用域


3.链表的实现

   Node{

      数据域

      引用域

   }

   MyLinkedList{

      记录元素总数的属性

      头节点属性

      head;

      尾节点属性

      trail;

     }
下面上代码


public class DoubleLinkedList{
	private static class Node {
		Object value;
		Node prev = this;
		Node next = this;

		Node(Object v) {
			value = v;
		}

		public String toString() {
			return value.toString();
		}
	}

	private Node head = new Node(null);
	// 头节点
	private int size;

	// 链表大小
	// 以下是接口方法
	public boolean addFirst(Object o) {
		addAfter(new Node(o), head);
		return true;
	}

	public boolean addLast(Object o) {
		addBefore(new Node(o), head);
		return true;
	}

	public boolean add(Object o) {
		return addLast(o);
	}

	public boolean add(int index, Object o) {
		addBefore(new Node(o), getNode(index));
		return true;
	}
	
	public boolean revise(int index, Object o) {
		reviseNode(new Node(o), getNode(index));
		return true;
	}
	
	public boolean remove(int index) {
		removeNode(getNode(index));
		return true;
	}

	public boolean removeFirst() {
		removeNode(head.next);
		return true;
	}

	public boolean removeLast() {
		removeNode(head.prev);
		return true;
	}

	public Object get(int index) {
		return getNode(index).value;
	}

	public int size() {
		return size;
	}

	public String toString() {
		StringBuffer s = new StringBuffer();
		Node node = head;
		for (int i = 0; i < size; i++) {
			node = node.next;
			if (i > 0)
				s.append("   ");
			s.append(node.value);
		}
		return s.toString();
	}

	private Node getNode(int index) {
		if (index < 0 || index >= size)
			System.out.println("错误");
		Node node = head.next;
		for (int i = 0; i < index; i++)
			node = node.next;
		return node;
	}

	private void addBefore(Node newNode, Node node) {
		newNode.next = node;
		newNode.prev = node.prev;
		newNode.next.prev = newNode;
		newNode.prev.next = newNode;
		size++;
	}
	
	private void reviseNode(Node newNode, Node node) {
		newNode.next = node.next;
		newNode.prev = node.prev;
		newNode.next.prev = newNode;
		newNode.prev.next = newNode;
	}

	private void addAfter(Node newNode, Node node) {
		newNode.prev = node;
		newNode.next = node.next;
		newNode.next.prev = newNode;
		newNode.prev.next = newNode;
		size++;
	}

	private void removeNode(Node node) {
		node.prev.next = node.next;
		node.next.prev = node.prev;
		node.prev = null;
		node.next = null;
		size--;
	}
}

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转载自crazymizzz.iteye.com/blog/2217586
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