“线程中的异常”；“主要”；java.util.NoTouchElementException错误，程序正在打印错误的结果_Java

“线程中的异常”；“主要”；java.util.NoTouchElementException错误，程序正在打印错误的结果

java

“线程中的异常”；“主要”；java.util.NoTouchElementException错误，程序正在打印错误的结果,java,Java,我必须写一个程序来计算邮寄的东西的运费以下是一些规范以及练习运行应该是什么样子：计算：用途：船法成本隔夜$5*重量两天$2*重量经济型$1*重量（是的，这只是=重量）在这个程序的数据验证中，您还需要在main方法中执行一些验证。具体而言：项目说明不能为空。物品重量必须大于0。装运方法必须是O、T或E。程序应接受小写或大写的等效值。运行示例：确保以println结束输出运行#1：未输入项目说明：输入项目说明：实际上，您已经在else块中调用了“getShipWeigh

我必须写一个程序来计算邮寄的东西的运费

以下是一些规范以及练习运行应该是什么样子：

计算：

用途：船法成本隔夜$5*重量两天$2*重量经济型$1*重量（是的，这只是=重量）在这个程序的数据验证中，您还需要在main方法中执行一些验证。具体而言：

项目说明不能为空。物品重量必须大于0。装运方法必须是O、T或E。程序应接受小写或大写的等效值。运行示例：确保以println结束输出

运行#1：未输入项目说明：

输入项目说明：

实际上，您已经在else块中调用了“getShipWeight（键盘）”和“getShipClass（键盘）”，这就是它再次请求权重的原因。只要对这些语句进行注释，您的代码就会正常运行。

很好，您正在学习java

我们的计划需要做一点小小的改变<代码>getShipWeight和

getShipClass

在实际代码中被调用两次

请使用此代码

import java.util.Scanner;

public class WeShipIt {

    public static final int OVERNIGHT_CHARGE = 5;
    public static final int TWO_DAY_CHARGE = 2;
    public static final int ECONOMY_CHARGE = 1;

    public static void main(String[] args) {
        Scanner keyboard = new Scanner(System.in); // scanner object to pass around
        double weight;
        String itemDescription;
        char shipMethod;
        double shippingCost;

        itemDescription = getitemDescription(keyboard);
        /*weight = getShipWeight(keyboard);
        shipMethod = getShipClass(keyboard);
        shippingCost = calculateShipping(shipMethod, weight);*/

        if (itemDescription.length() == 0) {

            System.out.println("Invalid description. Program cannot continue");
            System.exit(0);
        } else {
            weight = getShipWeight(keyboard);

            if (weight <= 0) {

                System.out.println("Invalid shipping weight. Program cannot continue");

            } else {
                shipMethod =getShipClass(keyboard);
                shippingCost = calculateShipping(shipMethod, weight);

                if (!(shipMethod == 'O' || shipMethod == 'T' || shipMethod == 'E')) {
                    System.out.println("Invalid shipping method. Program cannot continue");

                } else {
                    displayResults(itemDescription, weight, shipMethod, shippingCost);
                }
            }
        }
    }

//get item description
    public static String getitemDescription(Scanner keyboard) {

        System.out.println("Enter item description:");
        String itemDescription = keyboard.next();

        return itemDescription;
    }

//get item weight
    public static double getShipWeight(Scanner console) {

        System.out.println("Enter item weight in lbs:");
        double itemWeight = console.nextDouble();
        return itemWeight;
    }

    // get user's choice for shipping method and return it
    public static char getShipClass(Scanner keyboard) {
        char shipMethod;

        // get shipping method
        System.out.println();
        System.out.println("How would you like to ship your package:");
        System.out.println("(O)vernight");
        System.out.println("(T)wo Days");
        System.out.println("(E)conomy (may take up to 7 days)");
        System.out.println("Choose an option: ");
        shipMethod = keyboard.next().charAt(0); // Prof. Dan says leave this line in here. Will explain in class.
        shipMethod = Character.toUpperCase(shipMethod);

        return shipMethod;
    }

    // calculate and return shipping charge
    public static double calculateShipping(char shipMethod, double weight) {
        double shipCharge;

        if (shipMethod == 'O') {
            shipCharge = weight * OVERNIGHT_CHARGE;
        } else if (shipMethod == 'T') {
            shipCharge = weight * TWO_DAY_CHARGE;
        } else if (shipMethod == 'E') {
            shipCharge = weight * ECONOMY_CHARGE;
        } else {
            shipCharge = 0;
        }
        return shipCharge;
    }

    // display shipping charge invoice
    public static void displayResults(String itemDescription, double shipWeight, char shipMethod, double shipCost) {
        System.out.println();
        System.out.println("*** WE SHIP INVOICE ****");
        System.out.println("Item Description: " + itemDescription);
        System.out.println("Item Weight: "+ shipWeight);
        System.out.println("Ship Method: " + shipMethod);
        System.out.println("Total Cost: $"+ shipCost);
    }
}

import java.util.Scanner；
公共类WeShipIt{
公共静态最终整夜费用=5；
公共静态最终int两天费用=2；
公共静态最终综合经济费用=1；
公共静态void main（字符串[]args）{
扫描仪键盘=新扫描仪（System.in）；//要传递的扫描仪对象
双倍重量；
字符串项描述；
炭沉淀法；
双重运输成本；
itemDescription=getitemDescription（键盘）；
/*重量=getShipWeight（键盘）；
shipMethod=getShipClass（键盘）；
装运成本=计算装运（装运方法、重量）*/
if（itemDescription.length（）=0）{
System.out.println（“无效说明。程序无法继续”）；
系统出口（0）；
}否则{
重量=getShipWeight（键盘）；
如果（重量显示的代码有2个错误，如下所示：
1:System.out.printf（“项目重量：%.2f\n”+装运重量）；
和

System.out.printf（“总成本：$%.2f\n”+发货成本）；


执行此操作将引发MissingFormatArgumentException


原因当使用printf并声明参数时，它会使用第一个参数进行自我调整
变量（要打印的值）在逗号之后传递给它
没有任何逗号，因此它不会识别并抛出MissingFormatArgumentException

相反，你应该这样写：
System.out.printf("Item Weight: %.2f\n",shipWeight);
System.out.printf("Total Cost: $%.2f\n", shipCost);

2：您正在调用getShipWeight（键盘）
和getShipClass（键盘）两次。

第一次，当用户刚进入程序时。

第二次，在else语句中。

这迫使你重新输入重量和运输方式
以下是最后的修改：
public static final int OVERNIGHT_CHARGE = 5;
    public static final int TWO_DAY_CHARGE = 2;
    public static final int ECONOMY_CHARGE = 1;

    public static void main(String[] args){
      Scanner keyboard = new Scanner(System.in);  //scanner object to pass around
      double weight;
      String itemDescription;
      char shipMethod;
      double shippingCost;
        
      itemDescription = getitemDescription(keyboard);
      weight = getShipWeight(keyboard);
      shipMethod = getShipClass(keyboard);
      shippingCost = calculateShipping(shipMethod, weight);
      
      
      if (itemDescription.length() == 0){
         
         System.out.println("Invalid description. Program cannot continue");
         System.exit(0);
      } else {
          // getShipWeight(keyboard); <-- this is forcing uset to enter weight again. 
         if (weight <= 0){
         
         System.out.println("Invalid shipping weight. Program cannot continue");

         } else {
           // getShipClass(keyboard); <--  this is forcing user to again give shipping method
          if (!(shipMethod == 'O' || shipMethod == 'T' || shipMethod == 'E')){
         System.out.println("Invalid shipping method. Program cannot continue");
         
         } else {
         displayResults(itemDescription, weight, shipMethod, shippingCost);
         }
         }
         }
    }
    //get item description
      public static String getitemDescription(Scanner keyboard){
          
      System.out.println("Enter item description:");
      String itemDescription = keyboard.next();

      return itemDescription;
      }

    //get item weight
    public static double getShipWeight(Scanner console){
           
      System.out.println("Enter item weight in lbs:");
      double itemWeight = console.nextDouble();

      return itemWeight;
    }

     //get user's choice for shipping method and return it
     public static char getShipClass(Scanner keyboard) {
      char shipMethod;

      //get shipping method
      System.out.println();
      System.out.println("How would you like to ship your package:");
      System.out.println("(O)vernight");
      System.out.println("(T)wo Days");
      System.out.println("(E)conomy (may take up to 7 days)");
      System.out.println("Choose an option: ");
      shipMethod = keyboard.next().charAt(0); //Prof. Dan says leave this line in here. Will explain in 
      shipMethod = Character.toUpperCase(shipMethod);
      
      return shipMethod;
    }

     //calculate and return shipping charge
     public static double calculateShipping(char shipMethod, double weight){
      double shipCharge;
      
      if (shipMethod == 'O') {
      shipCharge = weight * OVERNIGHT_CHARGE;
      } 
      else if (shipMethod == 'T') {
      shipCharge = weight * TWO_DAY_CHARGE;
      } 
      else if (shipMethod == 'E') {
      shipCharge = weight * ECONOMY_CHARGE;
      } else {
      shipCharge = 0;
      }
      return shipCharge;
    }

     //display shipping charge invoice
     public static void displayResults(String itemDescription, double shipWeight, char shipMethod, double 
     shipCost) {
      System.out.println();
      System.out.println("*** WE SHIP INVOICE ****");
      System.out.println("Item Description: " + itemDescription);
      System.out.printf("Item Weight: %.2f\n",shipWeight); // <-- changed
      System.out.println("Ship Method: " + shipMethod);
      System.out.printf("Total Cost: $%.2f\n", shipCost);  // <-- changed
     }

这回答了你的问题吗？
System.out.printf("Item Weight: %.2f\n",shipWeight);
System.out.printf("Total Cost: $%.2f\n", shipCost);

public static final int OVERNIGHT_CHARGE = 5;
    public static final int TWO_DAY_CHARGE = 2;
    public static final int ECONOMY_CHARGE = 1;

    public static void main(String[] args){
      Scanner keyboard = new Scanner(System.in);  //scanner object to pass around
      double weight;
      String itemDescription;
      char shipMethod;
      double shippingCost;
        
      itemDescription = getitemDescription(keyboard);
      weight = getShipWeight(keyboard);
      shipMethod = getShipClass(keyboard);
      shippingCost = calculateShipping(shipMethod, weight);
      
      
      if (itemDescription.length() == 0){
         
         System.out.println("Invalid description. Program cannot continue");
         System.exit(0);
      } else {
          // getShipWeight(keyboard); <-- this is forcing uset to enter weight again. 
         if (weight <= 0){
         
         System.out.println("Invalid shipping weight. Program cannot continue");

         } else {
           // getShipClass(keyboard); <--  this is forcing user to again give shipping method
          if (!(shipMethod == 'O' || shipMethod == 'T' || shipMethod == 'E')){
         System.out.println("Invalid shipping method. Program cannot continue");
         
         } else {
         displayResults(itemDescription, weight, shipMethod, shippingCost);
         }
         }
         }
    }
    //get item description
      public static String getitemDescription(Scanner keyboard){
          
      System.out.println("Enter item description:");
      String itemDescription = keyboard.next();

      return itemDescription;
      }

    //get item weight
    public static double getShipWeight(Scanner console){
           
      System.out.println("Enter item weight in lbs:");
      double itemWeight = console.nextDouble();

      return itemWeight;
    }

     //get user's choice for shipping method and return it
     public static char getShipClass(Scanner keyboard) {
      char shipMethod;

      //get shipping method
      System.out.println();
      System.out.println("How would you like to ship your package:");
      System.out.println("(O)vernight");
      System.out.println("(T)wo Days");
      System.out.println("(E)conomy (may take up to 7 days)");
      System.out.println("Choose an option: ");
      shipMethod = keyboard.next().charAt(0); //Prof. Dan says leave this line in here. Will explain in 
      shipMethod = Character.toUpperCase(shipMethod);
      
      return shipMethod;
    }

     //calculate and return shipping charge
     public static double calculateShipping(char shipMethod, double weight){
      double shipCharge;
      
      if (shipMethod == 'O') {
      shipCharge = weight * OVERNIGHT_CHARGE;
      } 
      else if (shipMethod == 'T') {
      shipCharge = weight * TWO_DAY_CHARGE;
      } 
      else if (shipMethod == 'E') {
      shipCharge = weight * ECONOMY_CHARGE;
      } else {
      shipCharge = 0;
      }
      return shipCharge;
    }

     //display shipping charge invoice
     public static void displayResults(String itemDescription, double shipWeight, char shipMethod, double 
     shipCost) {
      System.out.println();
      System.out.println("*** WE SHIP INVOICE ****");
      System.out.println("Item Description: " + itemDescription);
      System.out.printf("Item Weight: %.2f\n",shipWeight); // <-- changed
      System.out.println("Ship Method: " + shipMethod);
      System.out.printf("Total Cost: $%.2f\n", shipCost);  // <-- changed
     }

Enter item description:
box
Enter item weight in lbs:
3.5

How would you like to ship your package:
(O)vernight
(T)wo Days
(E)conomy (may take up to 7 days)
Choose an option: 
O

*** WE SHIP INVOICE ****
Item Description: box
Item Weight: 3.50
Ship Method: O
Total Cost: $17.50