System.out.println（）和BufferedReader在控制檯中混合輸出

Question

我目前正在開發一個程序，它使用BufferedReader來讀取輸入，而System.out.println()用於輸出。

這裏是我的代碼：

public void chooseMethod() throws IOException{ 
    int in = 0; 
    while(true){ 

     System.out.println("What do you want to do? (0 to exit, 1 to read Bank   Account, 2 to write Bank Account, 3 to read Bill, 4 to write Bill): "); 

     in = Integer.parseInt(cin.readLine()); 

     if(in == 0){ 
      break; 
     }else if((in < 0) || (in > 4)){ 
      System.out.println("Invalid choice."); 
     }else if(in == 1){ 
      showBankAccount(); 
     }else if(in == 2){ 
      insertBankAccount(); 
     }else if(in == 3){ 
      showBill(); 
     }else if(in == 4){ 
      insertBill(); 
     } 

    } 

    dbm.close(); 

} 

public void insertBankAccount() throws IOException{ 
    int bankNr = 0; 
    int sortCode = 0; 
    int accountNumber = 0; 
    int balance = 0; 
    int interest = 0; 
    String details; 
    String name; 

    while(true){ 
     System.out.println("Enter bankNr (0 to exit): "); 
     bankNr = Integer.parseInt(cin.readLine()); 

     if(bankNr == 0){ 
      break; 

     }else if(bankNr <= maxBankNr){ 
      System.out.println("Invalid Number: already taken"); 
      break; 
     } 

     System.out.println("Enter Account Name: "); 
     name = cin.readLine(); 

     System.out.println("Enter Sort Code: "); 
     sortCode = Integer.parseInt(cin.readLine()); 

     System.out.println("Enter Account Number: "); 
     accountNumber = Integer.parseInt(cin.readLine()); 

     System.out.println("Enter balance: "); 
     balance = Integer.parseInt(cin.readLine()); 

     System.out.println("Enter Interest: "); 
     interest = Integer.parseInt(cin.readLine()); 

     System.out.println("Enter Details: "); 
     details = cin.readLine(); 

     bankAccountDAO.insertBankAccount(bankNr, sortCode, accountNumber, balance, interest, details, name); 
     this.maxBankNr = bankAccountDAO.getMaxBankNr(); 


    } 


} 

現在，說我輸入 「2」 到 「寫的銀行賬戶，」 輸出如下：

運行：

What do you want to do? (0 to exit, 1 to read Bank Account, 2 to write Bank Account, 3 to read Bill, 4 to write Bill): 

Enter bankNr (0 to exit): 

2 

輸出中的這個「2」應該在「輸入bankNr（0退出）之前：」

我已經有過幾次這個問題，兩個w ith Scanner和BufferedReader，並花了很長時間google搜索，但似乎無法找到任何答案。

有沒有其他人有這個問題？如果是這樣，你是如何解決它的？

Answer 1

在你insertBankAccount()方法內while循環變化：

System.out.println("Enter bankNr (0 to exit): "); 
bankNr = Integer.parseInt(cin.readLine()); 

要：

bankNr = Integer.parseInt(cin.readLine()); 
System.out.println("Enter bankNr (0 to exit): ");