Java 集合 将List的所有元素附加到LinkedList

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
class LinkedListAddAll {

  public static void main(String[] args) {

     // create a LinkedList
     LinkedList<String> list = new LinkedList<String>();

     // Add elements to the LinkedList
     list.add("AA");
     list.add("BB");
     list.add("CC");
     list.add("DD");

     // Displaying linked list before add
     System.out.println("Before: LinkedList: " + list);

     // create a new list having few elements
     List<String> arrayList = new ArrayList<String>();
     arrayList.add("Item1");
     arrayList.add("Item2");
     arrayList.add("Item3");

     // Append the list elements to LinkedList
     list.addAll(arrayList);

     // Displaying the LinkedList after addAll
     System.out.println("After: LinkedList: " + list);
  }
}

Before: LinkedList: [AA, BB, CC, DD]
After: LinkedList: [AA, BB, CC, DD, Item1, Item2, Item3]