java - 使用 printf() 时遇到问题

Question

这是我到目前为止的代码。

import java.util.Scanner;
public class two {

    public static void main(String[] args) {
        System.out.println("--- Stage 1 Taxi Fare Calculator ---");

        Scanner user_input = new Scanner( System.in );

        System.out.print("Enter in pick up time:  ");
        System.out.flush();
        String startTime = user_input.next();

        System.out.print("Enter in pickup point:  ");
        System.out.flush();
        String pickUp = user_input.next();

        System.out.print("Enter in drop off point:  ");
        System.out.flush();
        String dropOff = user_input.next();

        System.out.print("Enter in trip distance in km:  ");
        System.out.flush();
        Double tripDist = user_input.nextDouble();
        user_input.nextLine();

        Double fareRate = 1.60;
        Double baseFare = tripDist * fareRate;
        Double totalFare = baseFare;

        String m1 = "The pickup point was: %15s%n";
        String m2 = "The drop off point was: %13s%n";
        String m3 = "The pickup time was: %11s%n";
        String m4 = "Estimated distance (km): %12f%n";
        String m5 = "Fare Charged: $%11.2f%n";
        String m6 = "Base fare: $%15.2f%n";
        String m7 = "Total fare: $%14.2f%n";
        String m8 = "Plus surcharges: $%14.2f%n";
        System.out.println(" --- Taxi fare details --- ");
        System.out.printf(m1, pickUp); 
        System.out.printf(m2, dropOff);
        System.out.printf(m3, startTime);
        System.out.printf(m4, tripDist);
        System.out.printf(m5, fareRate);
        System.out.printf(m6, baseFare);
        System.out.printf(m7, totalFare);
    }


}

编辑2(最终):我已经在我的代码中添加了更多内容，现在已经得到了您在上面看到的内容，现在我需要做的就是添加附加费，所以当它在特定时间时，它是一定的成本，也是区域的附加费，无论如何不寻求帮助，只是让你们知道你们已经提供了很多帮助，我谢谢你们。顺便说一句，如果我不应该尽可能多地编辑此内容，我深表歉意。

Answer 1

如果您在读取变量的同一行声明变量，您的代码可能会更短，并且如果您不使用 println()，则应该 flush()，即

System.out.print("Enter in pick up time:  ");
System.out.flush();
String startTime = user_input.next();

System.out.print("Enter in pickup point:  ");
System.out.flush();
String pickUp = user_input.next();

System.out.print("Enter in drop off point:  ");
System.out.flush();
String dropOff = user_input.next();

System.out.print("Enter in trip distance in km:  ");
System.out.flush();
Double tripDist = user_input.nextDouble();
user_input.nextLine();

然后，您需要在格式中包含输出类型String(s)，

String m1 = "The pickup point was: %s%n"; // %n or \n - both are newline
String m2 = "The drop off point was: %s%n";
String m3 = "The pickup time was: %s%n";
String m4 = "Estimated distance (km): %f%n";
String m5 = "Fare Charged: $%.2f%n";
String m6 = "Base fare: $%.2f%n";
String m7 = "Total fare: $%.2f%n";

接下来，当您调用 printf() 时，您应该传递参数，而不是连接 -

System.out.printf(m1, pickUp);
System.out.printf(m2, dropOff);
System.out.printf(m3, startTime);
System.out.printf(m4, tripDist);
System.out.printf(m5, fareRate);
System.out.printf(m6, baseFare);
System.out.printf(m7, totalFare);

然后我认为它会按照您的预期工作。