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);

     }

 }