Poll, pop and push element to a LinkedList

E poll(): Retrieves and removes the head (first element) of this list
E pollFirst(): Retrieves and removes the first element of this list, or returns null if this list is empty.
E pollLast(): Retrieves and removes the last element of this list, or returns null if this list is empty.
E pop(): Pops an element from the stack represented by this list.
void push(E e): Pushes an element onto the stack represented by this list.


  import java.util.LinkedList;

public class Main{
    public static void main(String args[]) {
        LinkedList<String> ll = new LinkedList<String>();

        ll.add("A");
        ll.add("java2s.com");
        ll.add("B");
        ll.add("C");
        ll.add("java2s.com");


        String str = ll.poll();
        System.out.println(str);
        System.out.println(ll);
    }
}

The output:


A
[java2s.com, B, C, java2s.com]


  import java.util.LinkedList;

public class Main{
    public static void main(String args[]) {
        LinkedList<String> ll = new LinkedList<String>();

        ll.add("A");
        ll.add("java2s.com");
        ll.add("B");
        ll.add("C");
        ll.add("java2s.com");


        String str = ll.pollLast();
        System.out.println(str);
        System.out.println(ll);
    }
}

The output:


java2s.com
[A, java2s.com, B, C]

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