运行 DO WHILE 循环后，扫描仪不工作

Question

I have no idea why my scanner for the staffID and staffPassword is not working after I choose to continue typing a new record.

Click to see the output of the code

public class Test {
    public static void main(String args[]){

        String staffID, staffPassword; //Staff Record Variable
        int a = 0;
        boolean validation;
        Staff[] staff = new Staff[1000];
        int staffCount = 0;
        Scanner input = new Scanner(System.in);

        do{
            staff[staffCount] = new Staff();

            System.out.print("Staff ID: ");
            staffID = input.nextLine();
            staff[staffCount].SetStaffID(staffID);


            System.out.print("Password: ");
            staffPassword = input.nextLine();
            staff[staffCount].SetPassword(staffPassword);

            System.out.println("\nEnter 1 to continue, enter 2 to stop.");
            System.out.print("Continue to add more record?(1 or 0): " );
            a = input.nextInt();


        }while(a == 1);
    }
}

Answer 1

使用input.next()而不是input.nextLine()

Answer 2

This is because the nextInt() method doesn't consume the new line after hitting enter for the a variable. It's better to leave the nextLine() in its place because the next() works until it reach a delimiter (default white space). What does that mean? It means that if you're trying to set the staffID with next() like this : "Id For Staff", the actual staffID will be just "Id".

Instead of changing nextLine() to next() I suggest you to use a simple input.nextLine() after the last line of your do while ( a = input.nextInt(); )