Odd Even Linked List

I/O:

7

2 8 9 1 5 4 3

O/P:

2 8 9 1 5 4 3 

9 1 5 3 2 8 4 

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Odd_Even_LinkedList {
    public static class Node {
        int data;
        Node next;
    }

    public static class LinkedList {
        Node head;
        Node tail;
        int size;

        void addLast(int val) {
            Node temp = new Node();
            temp.data = val;
            temp.next = null;

            if (size == 0) {
                head = tail = temp;
            } else {
                tail.next = temp;
                tail = temp;
            }

            size++;
        }

        public int size() {
            return size;
        }

        public void display() {
            for (Node temp = head; temp != null; temp = temp.next) {
                System.out.print(temp.data + " ");
            }
            System.out.println();
        }

        public void removeFirst() {
            if (size == 0) {
                System.out.println("List is empty");
            } else if (size == 1) {
                head = tail = null;
                size = 0;
            } else {
                head = head.next;
                size--;
            }
        }

        // write your code here
        public void oddEven() {
            LinkedList odd = new LinkedList();
            LinkedList even = new LinkedList();
            Node temp = head;

            while (temp != null) {
                if (temp.data % 2 == 0) {
                    even.addLast(temp.data);
                } else {
                    odd.addLast(temp.data);
                }

                temp = temp.next;
                this.removeFirst();
            }
            // dono me data hai
            if (odd.size > 0 && even.size > 0) {
                odd.tail.next = even.head;
                head = odd.head;
                tail = even.tail;
                size = odd.size + even.size;
            } else if (odd.size > 0) {  // sirf odd me data hai
                head = odd.head;
                tail = odd.tail;
                size = odd.size;
            } else if (even.size > 0) {  // sirf even me data hai
                head = even.head;
                tail = even.tail;
                size = even.size;
            }

        }
    }

    public static void main(String[] args) throws Exception {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        int n1 = Integer.parseInt(br.readLine());
        LinkedList l1 = new LinkedList();
        String[] values1 = br.readLine().split(" ");
        for (int i = 0; i < n1; i++) {
            int d = Integer.parseInt(values1[i]);
            l1.addLast(d);
        }

        int a = Integer.parseInt(br.readLine());
        int b = Integer.parseInt(br.readLine());

        l1.display();
        l1.oddEven();
        l1.display();
    }
}