從文本文件中單獨添加元素到隊列

Question

我想從一個文本文件中一次添加一個名稱到一個隊列（鏈接），一個名稱。如果用戶選擇選項1，那麼它應該從列表中取出下一個名稱。

如果我想添加其他名稱，則不會讓我輸入另一個選項。

int choice = console.nextInt(); 

    FileReader names = new FileReader("Customer.txt"); 

    Scanner lookup = new Scanner(names); 

    Queue a = new Queue(); 


    String customerName; 
             // This loop was just to verify that 
    while(lookup.hasNextLine()){  // It was actually reading 

    customerName = lookup.next(); 
    System.out.println(customerName); 

    } 


    while(true){ 

     switch(choice){ 

    case 1: 
      customerName = lookup.next();//For some reason its not giving me 
      a.enqueue(customerName); // The choice to enter another number 
        break;   //even though I made the case while(true) 

    case 2: 

        break; 

    case 3: 

        break; 

    case 4: 

        break; 

    case 5: 

        break; 

    case 6: 
       System.out.println(" Exiting......"); 
     break; 


    default: 

     continue; 


    } 

    break; 
} 

Answer 1

這裏的問題是switch語句後有一箇中斷。這會導致您的代碼在switch語句執行一次後跳出while循環。

的解決方法是刪除了突破，因爲這樣：

while(true){ 

     switch(choice){ 

    case 1: 
      customerName = lookup.next();//For some reason its not giving me 
      a.enqueue(customerName); // The choice to enter another number 
        break;   //even though I made the case while(true) 

    case 2: 

        break; 

    case 3: 

        break; 

    case 4: 

        break; 

    case 5: 

        break; 

    case 6: 
       System.out.println(" Exiting......"); 
     break; 


    default: 

     continue; 


    } 

}