複数のwhileループで同じ文字列が解決されない

Question

私が構築しようとしているロジックは、ユーザーが合計4つのアフィリエイトを収集したときに、コンソールが4つに達したと印刷します。

4人で停止する場合は、「quit」と入力する必要があります。この問題は、if elseステートメントで2番目のwhileループで発生します。 「affは解決できません」というエラーが表示されます。

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; 
      } 
     } 

    } 

} 

Answer 1

あなたは一度だけSystem.inからScannerのインスタンスを作成し、ユーザからの入力を取得する必要がある場所であればどこでも同じインスタンスを使用する必要があります。

public static void main(String[] args){ 
System.out.println("Welcome back!");  
Scanner scanner = new Scanner(System.in); 
System.out.println("Username: "); String 
username = scanner.next(); 
System.out.println("Password: "); 
String password = scanner.next(); 
int affCount = 0; 
String aff = ""; 
while (affCount <= 4) { 
    System.out.println("enter new affiliate");  
    aff = scanner.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) 
      { 
       System.out.println("enter new affiliate"); 
       aff = scanner.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; } 
      } 
    }