Finding kth node from last of Linked list

#1

my code is compiled but it is giving wrong output despite having the correct logic please tell my mistake where I am wrong

#2

public static void main(String args[]) {

	Main mm=new Main();
	mm.addLast(1);
	mm.addLast(2);
	mm.addLast(3);
	mm.addLast(4);
	mm.addLast(5);
	mm.addLast(6);
	mm.kthNode(3);

}
Why are you doing hardcode

#3

take input from Scanner

#4

public void kthNode(int k){
Node first=this.head;
Node sec=this.head;
int count=1;

	while(count<=k){
	sec=sec.next;
	count++;
	}

	while(sec!=null){

		first=first.next;
		sec=sec.next;
		}
	System.out.println(first.data);



}