问要求用户进行基本输入并返回值的Java程序

EN

package questionOne;

import java.util.Scanner;
import questionOne.DeliveryMenu;

public class DeliveryMenuDemo {

public static void main(String[] args)
    throws java.io.IOException {

    String choice;

    DeliveryMenu d = new DeliveryMenu();

    System.out.println("Enter the type of Delivery service needed (Standard/Super/WowWee)?");

    Scanner scanner = new Scanner(System.in);
    choice = scanner.next();
    d.setDeliveryCost(choice);
    d.getPrice();


}

package questionOne;

public class DeliveryMenu {

private static String delivery;
private static int price=0;

public static int setDeliveryCost(String choice) {
    if(delivery == "Standard") {
        price = price + 22;
    } else if (delivery == "Super") {
        price = price + 44;
    } else if (delivery == "wow-wee") {
        price = price + 60;
    }   
    return price;
}

public String setDelivery(String s) {
    return delivery=s;
}

public void getPrice() {
    System.out.println(price);
}