循环跳过Java中的用户输入

Question

每次我在do-while循环结束时键入Y时，它都不会让我键入“输入要任命的姓名”我尝试更改c = input.next（）;到c = input.nextLine（）;但仍然没有工作。为什么？请帮助

import java.util.Scanner;
import APP.*;
public class AppointmentTest
{
public static void main(String[] args)
{
    Appointment app = new Appointment();
    String m, y;
    double st, et;
    //char c;
    String c;
    Scanner input = new Scanner (System.in);

    do
    {
        System.out.print("Enter name for the appointment :");
        m = input.nextLine();
        app.setName(m);
        System.out.print("Enter day appointment :");
        y = input.nextLine();
        app.setDay(y);
        System.out.print("Enter start time :");
        st = input.nextDouble();
        app.setStartTime(st);
        System.out.print("Enter end time :");
        et = input.nextDouble();
        app.setEndTime(et);
        System.out.println("Duration of appointment :");
        System.out.print("Do you have any other appointment? (Y/N) :");
        //c = input.next().charAt(0);
        c = input.next();


    }while (c != "N" && c != "n");

}

}

Answer 1

[运算符!=或==检查参考；不是内容。您需要使用.equals或..equalsIgnoreCase（用于不区分大小写的比较）。

执行以下操作：

    c = input.nextLine();

} while (!c.equalsIgnoreCase("N"));

也替换

st = input.nextDouble();

with

st = Double.parseDoublei(input.nextLine());

et = input.nextDouble()同样适用。检查Scanner is skipping nextLine() after using next() or nextFoo()?了解更多信息。