多个 while 循环中的同一字符串未解析

问：

我试图构建的逻辑是，当用户总共收集了四个会员时，控制台将打印他们已经达到四个，但如果他们愿意，他们仍然可以继续。

如果他们决定在四点停止，他们应该输入“退出”。问题在第二个 while 循环中使用 if else 语句出现。我收到错误“aff 无法解析”。

import java.util.Scanner;

public class Seption {

    public static void main(String[] args) {

        System.out.println("Welcome back!");    

        Scanner userName = new Scanner(System.in);
        System.out.println("Username: ");
        String username = userName.next();

        Scanner passWord = new Scanner(System.in);
        System.out.println("Password: ");
        String password = passWord.next();

        int affCount = 0;

        while (affCount <= 4) {

            Scanner newAff = new Scanner(System.in);
            System.out.println("enter new affiliate");
            String aff = newAff.nextLine();

            System.out.println("Alright, " + aff + " is now your new affiliate!");

            affCount = affCount + 1;
            System.out.println("You now have " + affCount + " affiliates");

            if (affCount == 4) {

                System.out.println("Congratulations! You've accumulated 4 affiliates!"
                    + " any new affiliates added to this branch will be extra earnings"
                    + " You can also make a new branch and start over"
                    + " To quit this branch, Type 'quit'");

            continue;
            }
        }

        while (affCount > 4) {

            if (aff.equals("quit") == false) {

                Scanner newAff = new Scanner(System.in);
                System.out.println("enter new affiliate");
                String aff = newAff.nextLine();

                System.out.println("Alright, " + aff + " is now your new affiliate!");

                affCount = affCount + 1;
                System.out.println("You now have " + affCount + " affiliates");

            }

            else if (aff.equals("quit")) {

                System.out.println("This branch is now over");
                break;
            }
        }

    }

}