Analysis of Java LinkedList collection function examples

Since the underlying data structure of LinkedList is a linked list, there are some unique functions corresponding to the set from the linked list.

Framework code:

public class LinkedListDemo {
  public static void main(String[] args) {
    //创建集合对象
    LinkedList<String> linkedList = new LinkedList<String>();

    //添加元素
    linkedList.add("hello");
    linkedList.add("world");
    linkedList.add("java");

    //输出集合
    System.out.println(linkedList);
  }
}

Specific method implementation code:

　　　　　//public void addFirst(E e): 在该列表开头插入指定的元素
    linkedList.addFirst("javase"); //[javase, hello, world, java]

    //public void addLast(E e): 将指定的元素追加到此列表的末尾
    linkedList.addLast("javaee"); //[javase, hello, world, java, javaee]

//public E getFirst(): 返回此列表中的第一个元素
    System.out.println(linkedList.getFirst());
    /*
      hello
      [hello, world, java]
     */

//public E getLast(): 返回此列表中的最后一个元素
    System.out.println(linkedList.getLast());
    /*
      java
      [hello, world, java]
     */

//public E removeFirst(): 从此列表中删除并返回第一个元素
    System.out.println(linkedList.removeFirst());
    /*
      hello
      [world, java]
     */

//public E removeLast() : 从此列表中删除并返回最后一个元素
    System.out.println(linkedList.removeLast());
    /*
      java
      [hello, world]
     */

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