1、

package com.shengsiyuan;

import java.util.LinkedList;

public class LinkedListTest1
{
    public static void main(String[] args)
    {
        LinkedList list = new LinkedList();
        
        list.add("F");
        list.add("B");
        list.add("D");
        list.add("E");
        list.add("C");
        
        list.addLast("Z");
        list.addFirst("A");
        
        list.add(1, "A2");
        
        System.out.println("最初的集合：" + list);
        
        list.remove("F");
        list.remove(2);
        
        System.out.println("变化后的集合：" + list);
        
        Object value = list.get(2);
        list.set(2, (String)value + "changed");
        
        System.out.println("最后的集合：" + list);
    
      }
}

2、

package com.shengsiyuan;

public class Node
{
    String date;
    
    Node next;
    
    public Node(String date)
    {
        this.date = date;
    }
}

package com.shengsiyuan;

public class NodeTest 
{
    public static void main(String[] args)
    {
        Node node1 = new Node("node1");
        Node node2 = new Node("node2");
        Node node3 = new Node("node3");
        
        node1.next = node2;
        node2.next = node3;
        
        System.out.println(node1.next.next.date);
        
        System.out.println("-------------------");
        
        Node node4 = new Node("node4");
        
        node1.next = node4;
        node4.next = node2;
        
        System.out.println(node1.next.next.next.date);
        
        node1.next = node2;
        node4.next = null;
        
        System.out.println(node1.next.next.date);
            
    }
}