System.out.println() 和 BufferedReader 在控制台中混合输出

Question

我目前正在开发一个程序，该程序使用BufferedReader 读取输入，System.out.println() 用于输出。

这是我的代码：

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();


    }


}

现在，假设我输入“2”来“写银行账户”，输出如下：

运行：

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

输出中的这个“2”应该在“Enter bankNr(0 to exit):”之前

我曾多次遇到过这个问题，Scanner 和 BufferedReader 都遇到过这个问题，并且在谷歌上搜索了很长时间，但似乎找不到任何答案。

还有其他人遇到过这个问题吗？如果是这样，您是如何解决的？

Answer 1

在你的 insertBankAccount() 方法里面 while 循环改变：

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

收件人：

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