我不知道如何解决 nextLine 问题并使其正常工作

do {
        System.out.println("write in format \"firstname lastname\"");
            
        //just want to scan a sentence with spaces
        String[] tempArr = sc.nextLine().split(" ");
            
        System.out.println("Hello " + tempArr[0]);

        System.out.println("Do you want to do it again Y/N");

    }while(sc.next().equals("Y"));

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (true) {
            System.out.println("write in format \"firstname lastname\"");
            String[] tempArr = sc.nextLine().split(" ");
            System.out.println("Hello " + tempArr[0]);
            System.out.println("Do you want to do it again Y/N");
            String answer = sc.nextLine();
            if (!answer.equalsIgnoreCase("Y")) {
                break;
            }
        }
    }
}