LinkedList 类

package com.oracle.demo01;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedList;

public class Demo01 {
    public static void main(String[] args) {
        //ArrayList  数组结构：查询快，增删慢
        //LinkedList  链表结构：查询慢，增删快
        LinkedList<String> arr=new LinkedList<String>();
        arr.add("hello");
        arr.addFirst("范闲");
        arr.addLast("范若若");
        
        //删除
        arr.removeFirst();
        arr.removeLast();
                
        //遍历
        for(String p:arr){
            System.out.println(p);
        }
        
        //获取
        System.out.println(arr.getFirst());
        System.out.println(arr.getLast());
        
        //判断是否为空
        System.out.println(arr.isEmpty());
        
        
    }
}