如何在第三次無效嘗試後停止While循環？

Question

所以我有一個關於停止循環的大問題。主要問題是我必須在用戶輸入無效3次後停止while循環。但是，我不知道該怎麼做。

如何在第三次無效嘗試後停止while循環？

我應該使用什麼樣的代碼？

import java.text.DecimalFormat; 
import java.util.Scanner; 

public class CalculatePay { 

    public static void main(String[] args) { 
     Scanner reader = new Scanner(System.in); 

     String Name = " "; 
     int hours; 
     double payRate; 
     char F; 
     char P; 
     char T; 
     char repeat; 
     String input = " "; 

     double grossPay; 

     System.out.print("What is your name? "); 
     Name = reader.nextLine(); 
     System.out.print("How many hours did you work? "); 
     hours = reader.nextInt(); 
     while (hours < 0 || hours > 280) 
    { 
      System.out.println("That's not possible, try again!"); 
      hours = reader.nextInt(); 
      attempt++; 
     if(attempt == 3) 
     System.out.println("You are Fired!"); 

      { 
      return; 
      } 

     } 
     System.out.print("What is your pay rate? "); 
     payRate = reader.nextDouble(); 
     System.out.print("What type of employee are you? "); 
     F = reader.next().charAt(0); 


     grossPay = hours * payRate; 
     DecimalFormat decFor = new DecimalFormat("0.00"); 

     switch (F){ 
      // irrelevant for the question 
     } 
    } 
} 

Answer 1

像亞當建議，你需要一個計數器，如：

int attempt = 0; 
    while (hours < 0 || hours > 280) { 
     System.out.println("That's not possible, try again!"); 
     hours = reader.nextInt(); 
     attempt++; 

     // do something if you reach the limit. The >= comparison is 
     // useless before attempt will never go over 4. 
     if(attempt == 3){ 
      // notify the user that something wrong happened 
      System.out.println("Your error message here"); 

      // exit the main function, further code is not processed 
      return; 
     } 
    } 

我提出了一個消息打印並返回。爲了您的信息，其他選項可以是：

• 投與throw new MaxAttemptReachedException();
• 退出異常while循環，但繼續處理與break;指令下面的代碼。

Answer 2

林假設這是你想要做什麼......

int attempt = 0; 
while (hours < 0 || hours > 280) 
{ 
     System.out.println("That's not possible, try again!"); 
     hours = reader.nextInt(); 
     attempt++; 
    if(attempt >= 3) 
     { 
     break; 
     } 

    }