需要为每个循环创建一个具有不同用户输入的 java 循环

Question

我有以下代码显示输入的每个客户的停车票。

我需要创建一个 for 或 while 循环，显示 9 次停车票，允许用户在每个循环中输入不同的客户名称、rego 编号和停车小时数。我不确定该怎么做。

package week3;

import java.util.Scanner; 
public class Week3 
{
  static final double costPerHour = 4.25;

public static void main(String[] args) 
{
    String customerName;
    String customerNumberPlate;
    int hoursParked;
    double parkingFee; 


Scanner inText = new Scanner(System.in); //Create scanner object
Scanner inNumber = new Scanner(System.in); //Create scanner object

System.out.print("Please enter name of customer >>> "); //Prompt asking user for name
customerName = inText.nextLine(); //Declare string object

System.out.print("Please enter number plate of " + customerName +"'s vehicle >>> "); //Prompt asking for user number plate
customerNumberPlate = inText.nextLine();

System.out.print("Please enter hours customer parked >>> ");
hoursParked = inNumber.nextInt();

   if(hoursParked > 0 && hoursParked <=1) //Set boundaries 
    parkingFee = 4.25;

 else
    if (hoursParked > 1 && hoursParked <= 6) 
    parkingFee = (3.50 * hoursParked);

 else 
    parkingFee = (2.75 * hoursParked);

System.out.println("\n" + "--------Receipt--------" + "\n" 
+ "Customer: " + customerName + "\n"     
+ "Number Plate >>> " +  customerNumberPlate + "\n"
+ "Hours Parked >>> " + hoursParked + "\n"
+ "Parking Fee >>> " + parkingFee);
}
}

Answer 1

• 您可以使用循环for、while 或do ... while 来获得结果。在下面的例子中，我使用循环for。也许您可以更改循环的类型。
• 您不需要两个Scanner 对象。一物足矣。在这里，我将其命名为 Scanner input = new Scanner(System.in)，在每个循环结束时，您需要使用此代码 input.nextLine() 清理实际输入行（请参见下面的代码）。
• 当用户在客户停车时间的数字位置输入字母时，代码会生成错误（Java 中的异常）。您需要了解如何使用try ... catch bloc 处理此错误。

在循环while的情况下：

int counter = 0;

while (counter < 9) {

  /* your actual code */

  counter++;

}

在循环的情况下do ... while：

int counter = 0;

do {

  /* your actual code */

  counter++;

} while (counter < 9);

在for循环的情况下： （这里代码比较完整）

package week3;
import java.util.Scanner; 
 public class Week3 
{
  static final double costPerHour = 4.25;

  public static void main(String[] args) 
  {
    String customerName;
    String customerNumberPlate;
    int hoursParked;
    double parkingFee; 

    Scanner input = new Scanner(System.in);

    for (int i = 0; i < 9; i++) {

        System.out.print("Please enter name of customer >>> "); //Prompt asking user for name
        customerName = input.nextLine(); //Declare string object

        System.out.print("Please enter number plate of " + customerName +"'s vehicle >>> "); //Prompt asking for user number plate
        customerNumberPlate = input.nextLine();

        System.out.print("Please enter hours customer parked >>> ");
        hoursParked = input.nextInt();

        if(hoursParked > 0 && hoursParked <=1) //Set boundaries 
            parkingFee = 4.25;

         else
            if (hoursParked > 1 && hoursParked <= 6) 
            parkingFee = (3.50 * hoursParked);

         else 
            parkingFee = (2.75 * hoursParked);

        System.out.println("\n" + "--------Receipt--------" + "\n" 
        + "Customer: " + customerName + "\n"     
        + "Number Plate >>> " +  customerNumberPlate + "\n"
        + "Hours Parked >>> " + hoursParked + "\n"
        + "Parking Fee >>> " + parkingFee);

        System.out.println("");

        input.nextLine(); // important: to clean the actual line

    }

 }
}