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);
     }
 }