链表底层实现（LinkList）

ArrayList

LinkList

链表底层实现

Node.java  (节点类）

package cn.Collection;

//用来表示一个节点
public class Node{
    Node previous;   //上一个节点
    Object obj;
    Node next;        //下一个节点
    
    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;
    }
    
}

Test01.java

package cn.Collection;

public class Test01 {
    private Node first;
    private Node last;
    private int size;
    
    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 {
            //直接往last节点后增加新节点
            
            n.setPrevious(last);
            n.setObj(obj);
            n.setNext(null);
            last.setNext(n); 
            
            last=n;
            
            
            
        }
        size++;
    }
    public int size() {
        return size;
    }
    public Object get(int index) {   //2
        //0,1,2,3,4
        Node temp=null;
        if(first!=null) {
            temp=first;
            for(int i=0;i<index;i++) {
                temp=temp.next;
            }
            
            
        }
        return temp.obj;
        
    }
    
    
    
    public static void main(String[] args) {
        Test01 list=new Test01(); 
        list.add("aaa");
        list.add("dd");
        list.add("d");
        System.out.println(list.size());
        System.out.println(list.get(1));
    }
}