自己实现LinkedList集合add,get,remove

自己实现LinkedList集合add,get,remove

• Node类

  public class Node {

  ....public Node previous;

  ....public Object obj;

  ....public Node next;

  ....

  ....public Node()

  ....{

  ........

  ....}

  ....public Node(Node previous, Object obj, Node next) {

  ........super();

  ........this.previous = previous;

  ........this.obj = obj;

  ........this.next = next;

  ....}

  ....public Node getPrevious() {

  ........return previous;

  ....}

  ....public void setPrevious(Node previous) {

  ........this.previous = previous;

  ....}

  ....public Object getObj() {

  ........return obj;

  ....}

  ....public void setObj(Object obj) {

  ........this.obj = obj;

  ....}

  ....public Node getNext() {

  ........return next;

  ....}

  ....public void setNext(Node next) {

  ........this.next = next;

  ....}

  }

  MyLinkedList类

  public class MyLinkedList {

      private Node first;

      private Node last;

      private int size=0;

     

      public void add(Object obj)

      {

      ....Node n = new Node();

      ....if (first == null)

      ....{

      ........n.setPrevious(null);

      ........n.setObj(obj);

      ........n.setNext(null);

      ........

      ........first = n;

      ........last = n;

      ....}

      ....else

      ....{

      ........n.setPrevious(last);

      ........n.setObj(obj);

      ........n.setNext(null);

      ........

      ........last.setNext(n);

      ........last = n;

      ....}

      ....size++;

      }

      public Object get(int index)

      {

  ........Node ntemp = node(index);

      ....return ntemp.getObj();

      }

     

      public void remove(int index)

      {

      ....Node ntemp = node(index);

      ....if(ntemp != null)

      ....{

      ........Node up = ntemp.getPrevious();

      ........Node down = ntemp.getNext();

      ........up.setNext(down);

      ........down.setPrevious(up);

      ....}

      }

     

      public Node node(int index)

      {

      ....Node nodeTemp = null;

      ....if(first != null)

      ....{

      ........nodeTemp = first;

      ........for(int i=0 ; i

      ........{

      ............nodeTemp = nodeTemp.getNext();

      ........}

      ....}

      ....return nodeTemp;

      }

     

      public int size()

      {

      ....return size;

      }

     

      public static void main(String[] args) {

      ....MyLinkedList linkList = new MyLinkedList();

      ....linkList.add("aa");

      ....linkList.add("bb");

      ....linkList.add("cc");

      ....linkList.remove(1);

      ....System.out.println("0:"+linkList.get(1));

      }

  }