LinkedList常用方法

package com.msb;

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

/**
 * @author lcc
 * @version V1.0
 * @Package com.msb
 * @date 2022/4/24 9:05
 */
public class LinkListTest {
    public static void main(String[] args) {
        LinkedList<String> list=new LinkedList();
        list.add("123");
        list.add("123");
        list.add("aaa");
        list.add("bbb");
        list.add("ccc");
        list.add("ddd");
        System.out.println(list);
        list.addFirst("ooo");
        list.addLast("xxx");
        System.out.println(list);
        list.offer("offer");//添加元素在尾端
        System.out.println(list);
        list.offerFirst("first");
        list.offerLast("last");
        System.out.println(list);
        System.out.println(list.poll());//删除头部元素
        System.out.println(list.pollFirst());
        System.out.println(list.pollLast());
        System.out.println(list);
        System.out.println(list.remove(0));//根据索引删除元素
        System.out.println(list.removeFirst());
        System.out.println(list.removeLast());//同样也是删除元素  但是与poll 有区别
        System.out.println(list);
        System.out.println("----------");
        //list.clear();
        //System.out.println(list.poll());//这里清空集合后 不会报错  1.6 之后出现
        //System.out.println(list.remove());//这里会出错  早期方法
        //集合遍历
        for (int i = 0; i <list.size() ; i++) {
            System.out.print(list.get(i));
        }

        System.out.println();
        for (String s : list) {
            System.out.print(s);
        }
        System.out.println();
        Iterator<String> iterator = list.iterator();
        while (iterator.hasNext()){
            System.out.print(iterator.next());
        }
        System.out.println();
        /*这里的iter 节省内存 会随着循环结束而结束*/
        for(Iterator<String> iterator1 = list.iterator();iterator1.hasNext();){
        System.out.print(iterator1.next());
    }
    }
}