java中用户输入值后的循环

public static void main(String args[])throws IOException{
              validNumbers = new int[200];
              Scanner sc1 = new Scanner(new File("validNumbers.txt"));
              int i = 0;  
              while(sc1.hasNextInt()) {
                  validNumbers[i++] = sc1.nextInt();                      
              }

              // Creating loop for what the user enters
              boolean newValidator = true;
              Scanner scanner = new Scanner(System.in);

              while(newValidator) {
                  System.out.print("Enter the account number: ");
                  String num = scanner.nextLine();

                  // If found, the calculations will get displayed 
                  if(validator(num)) {
                      System.out.print("The calculated value to this account is: " + calculator(num));
                      newValidator = false;
                      System.out.println("\n" + "Would you like to enter another account number? (y/n)");
                      String ans = "";
                      ans = scanner.nextLine();

                      // Needed the false, if not the code would keep asking to "Enter account number: "
                     if (ans.equals("y")) {
                         System.out.print("Enter the account number: ");
                         String num2 = scanner.nextLine();
                         System.out.print("The calculated value to this account is: " + calculator(num2));
                     } else if(ans.equals("n")) {
                         newValidator = false;
                         System.out.println("**Program Exit**");
                     }
                  }

                  // Wanted to add a loop for the user to decide if they want to continue iff wrong account is inputed
                  else {
                      System.out.println("Not valid account number" + "\n\n" + "Would you like to try again? (y/n)");
                      String ans = "";
                      ans = scanner.nextLine();
                      if(ans.equals("y")) {
                          newValidator = true;
                      }

                      // How the program terminates if the user does not wish to continue
                      else if(ans.equals("n")) {
                          newValidator = false;
                          System.out.println("Not valid input, the program is now terminated!");
                      }
                  }
             }
        }
  }

（使用java）代码执行以下操作：1.）当用户输入正确的数字时，它会看到该数字（在文件中）并添加数字2.）当该数字不在文件中时，它会知道该数字不在文件中，并告诉用户再试一次，如果用户不想，它会结束程序。***(使用java）代码没有做什么：1）在用户输入正确的代码后，程序将询问用户是否要输入另一个帐户（如果是，则添加一个帐户）。然后这就是我的问题所在，循环在第二次运行后结束，我需要它不断询问他们是否要输入用户想要退出的另一个帐号单元***

不需要有一个嵌套的问题询问另一个帐号，while循环本身会在重复时再次询问用户。
只需询问用户是否要输入另一个，如果用户不想，则退出循环。当“newvalidator”设置为false时，while循环将退出：

boolean newValidator = true;
while(newValidator) {
    System.out.print("Enter the account number: ");
    String num = scanner.nextLine();

    if(validator(num)) {
        System.out.println("The calculated value to this account is: " + calculator(num));
    }
    else {
        System.out.println("Not valid account number!");
    }

    System.out.println("\n\nWould you like to enter another account number? (y/n)");
    String ans = scanner.nextLine();

    if (ans.equals("n") || ans.equals("N")) {
        newValidator = false;       
    }
}
System.out.println("**Program Exit**");

java中用户输入值后的循环

1条答案

相关问题

热门标签

最新问答