java，返回链表中倒数第K个节点

import java.util.LinkedList;

public class Main {

    public static void main(String[] args) {
        Main main = new Main();
//        main.getKString(3);//f
        main.getKString(13);//null
    }

    public void getKString(int k){

        LinkedList<String> linkedList = new LinkedList<String>();
        linkedList.add("a");
        linkedList.add("b");
        linkedList.add("c");
        linkedList.add("d");
        linkedList.add("e");
        linkedList.add("f");
        linkedList.add("g");
        linkedList.add("h");

        if(linkedList.size() - k < 0){//如果长度不够
            System.out.println("null");
        }else{
            System.out.println(linkedList.get(linkedList.size() - k));
        }
    }
}