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import java.util.LinkedList;

public class Main {
    public static void main(String[] args) {
        LinkedList<String> lList = new LinkedList<String>();
        lList.add("1");
        lList.add("2");
        lList.add("3");
        lList.add("4");
        lList.add("5");
        System.out.println(lList);
        lList.addFirst("0");
        System.out.println(lList);
        lList.addLast("6");
        System.out.println(lList);
    }
}

[1, 2, 3, 4, 5]
[0, 1, 2, 3, 4, 5]
[0, 1, 2, 3, 4, 5, 6]