Ordered collection
null elements allowed
Duplicates elements allowed

LinkedList<String> ls = new LinkedList<>();

ls.add(null);
ls.add("ccc");
ls.add("bbb");
ls.add("bbb");
ls.add("aaa");
ls.add("aaa");
ls.add("aaa");

ls.forEach(System.out::println);

Output:

null
ccc
bbb
bbb
aaa
aaa
aaa

LinkedList<String> ls = new LinkedList<>();

ls.add("ccc");
ls.add("bbb");
ls.add("aaa");

Iterator<String> i = ls.iterator();

if (i.hasNext())
    i.next();

i.remove(); // removes the last element returned: ccc

ls.forEach(System.out::println);

Output:

bbb
aaa

LinkedList<String> ls = new LinkedList<>();

ls.add("ccc");
ls.add("bbb");
ls.add("aaa");

ListIterator<String> li = ls.listIterator();
ListIterator<String> li_copy = ls.listIterator();

if (li.hasNext())
    li.next();

li.set("zzz"); // this will replace the value "ccc"
li_copy.next(); // OK

li.add("eee");
// li_copy.next(); // this will throw java.util.ConcurrentModificationException

ls.forEach(System.out::println);

Output:

zzz
eee
bbb
aaa

LinkedList<String> ls = new LinkedList<>();

ls.add("c");
ls.add("bb");
ls.add("aaa");

Collections.sort(ls); // Objects must implement java.lang.Comparable<T> (Compiler error)
System.out.println(Collections.binarySearch(ls, "aaa")); // Objects must implement java.lang.Comparable<T> (Compiler error)

Collections.sort(ls, Comparator.comparing(String::length));
System.out.println(Collections.binarySearch(ls, "aaa", Comparator.comparing(String::length)));

Output:

0
2