Java 集合 LinkedList的开头和结尾添加元素

import java.util.LinkedList;

public class AddExample {
 public static void main(String[] args) {
    // Creating LinkedList of String Elements
    LinkedList<String> linkedlist = new LinkedList<String>();

    //Populating it with String values
    linkedlist.add("AA");
    linkedlist.add("BB");
    linkedlist.add("CC");
    linkedlist.add("DD");
    linkedlist.add("EE");

    //Displaying LinkedList elements
    System.out.println(linkedlist);

    //Adding an element at the beginning 
    linkedlist.addFirst("FIRST");

    //Displaying the List after addition
    System.out.println(linkedlist);

    //Adding an element at the end of list 
    linkedlist.addLast("LAST");

    //Displaying the final list
    System.out.println(linkedlist);
 }
}

[AA, BB, CC, DD, EE]
[FIRST, AA, BB, CC, DD, EE]
[FIRST, AA, BB, CC, DD, EE, LAST]