LinkedList类的基本方法的用法

package cn.zmh.LinkedList;

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

public class LinkendListDemo1 {
    public static void main(String[] args) {
        fun2();
        fun1_3();


    }

    // 1  addFirst();从前面添加   addLast(); 从后面添加
    public static void fun1() {
        LinkedList<String> link = new LinkedList<>();
        link.addFirst("钱");
        link.addFirst("赵");
        link.addLast("孙");
        link.addLast("李");
        Iterator<String> it = link.iterator();
        while (it.hasNext()) {
            String s = it.next();
            System.out.println(s);
        }
    }
    //  1_1  addFirst();从前面添加  getFirst();获取第一个元素
    //  Iterator  迭代器
    public static void fun1_1() {
        LinkedList<String> link = new LinkedList<>();
        link.addFirst("李白1");
        link.addFirst("李白2");
        link.addFirst("李白3");
        //获取第一个集合元素（李白3）；
        String first = link.getFirst();
        System.out.println(first);
        Iterator<String> it = link.iterator();
        while (it.hasNext()) {
            String s = it.next();
            System.out.println(s);
        }
    }
    // 1_2  集合转数组
    public static void fun1_2() {
        LinkedList<String> link = new LinkedList<>();
        link.addFirst("a1");
        link.addFirst("a2");
        link.addFirst("a3");
        System.out.println(link);
        Object[] array = link.toArray();
        //for循环
        for (int i=0;i<array.length;i++){
            System.out.println(array[i]);
        }
        //迭代器
        Iterator<String> it = link.iterator();
        while(it.hasNext()){
            String s = it.next();
            System.out.println(s);
        }
    }
    public static void fun1_3(){
        LinkedList<String> link = new LinkedList<>();
        link.add("a1");
        link.add("a2");
        link.add("a3");
        System.out.println(link);
        //删除第一个
        String rem = link.removeFirst();
        //删除最后一个
        String rem1 = link.removeLast();
        System.out.println("被删除的："+rem+"\t"+rem1);
        System.out.println(link);
    }
    // 2  getFirst();获取第一个     getLast(); 获取最后一个
    public static void fun2() {
        LinkedList<String> link = new LinkedList<>();
        link.add("张飞1");
        link.add("刘备2");
        link.add("关羽3");
        //isEmpty()  判断集合是否为空  在进行操作
        if (!link.isEmpty()) {
            String first = link.getFirst();
            System.out.println(first);
        }
    }
    //  3  removeFirst(); removeLast();删除功能
    public static void fun3() {
        LinkedList<String> link = new LinkedList<>();
        link.add("每当我听到雨声");
        link.add("就行听到了心中的迷茫");
        String s = link.removeFirst();
        System.out.println("被删除的：" + s);
        System.out.println(link);
    }
}