我已经成功地编制了我的 list 程序:

// Inventory.java part 1
// this program is to calculate the value of the inventory of the Electronics Department's cameras

import java.util.*;
import javax.swing.*;
import java.awt.event.*;
import java.io.*;

public class Inventory
{
   public static void main(String[] args)
   {
       // create Scanner to obtain input from the command window
       Scanner input = new Scanner (System.in);

       String name;
       int itemNumber; // first number to multiply
       int itemStock; // second number to multiply
       double itemPrice; //
       double totalValue; // product of number1 and number2



   while(true){       // infinite loop
              // make new Camera object

      System.out.print("Enter Department name: "); //prompt
      String itemDept = input.nextLine(); // read name from user

            if(itemDept.equals("stop"))  // exit the loop
           break;


 {
 System.out.print("Enter item name: "); // prompt
 name = input.nextLine(); // read first number from user
 input.nextLine();


     }

 System.out.print("Enter the item number: "); // prompt
 itemNumber = input.nextInt(); // read first number from user
 input.nextLine();
  while( itemNumber <= -1){
 System.out.print("Enter valid number:"); // prompt
 itemNumber = input.nextInt(); // read first number from user input.nextLine();
 } /* while statement with the condition that negative numbers are entered
 user is prompted to enter a positive number */

 System.out.print("Enter number of items on hand: "); // prompt
 itemStock = input.nextInt(); // read first number from user
 input.nextLine();
  while( itemStock <= -1){
 System.out.print("Enter positive number of items on hand:"); // prompt
 itemStock = input.nextInt(); // read first number from user
 input.nextLine();
 } /* while statement with the condition that negative numbers are entered
 user is prompted to enter a positive number */

 System.out.print("Enter item Price: "); // prompt
 itemPrice = input.nextDouble(); // read second number from user
 input.nextLine();
  while( itemPrice <= -1){
 System.out.print("Enter positive number for item price:"); // prompt
 itemPrice = input.nextDouble(); // read first number from user
 input.nextLine();
 } /* while statement with the condition that negative numbers are entered
 user is prompted to enter a positive number */


 Cam camera = new Cam(name, itemNumber, itemStock, itemPrice);

 totalValue = itemStock * itemPrice; // multiply numbers

 System.out.println("Department name:" + itemDept); // display Department name
 System.out.println("Item number: " + camera.getItemNumber()); //display Item number
 System.out.println("Product name:" + camera.getName()); // display the item
 System.out.println("Quantity: " + camera.getItemStock());
 System.out.println("Price per unit" + camera.getItemPrice());
 System.out.printf("Total value is: $%.2f\n" + totalValue); // display product

       } // end while method

   } // end method main

}/* end class Inventory */

class Cam{

private String name;
private int itemNumber;
private int itemStock;
private double itemPrice;
private String deptName;

public Cam(String name, int itemNumber, int itemStock, double itemPrice) {
this.name = name;
this.itemNumber = itemNumber;
this.itemStock = itemStock;
this.itemPrice = itemPrice;
   }

   public String getName(){
      return name;
      }



   public int getItemNumber(){
   return itemNumber;

}

   public int getItemStock(){
   return itemStock;

}

   public double getItemPrice(){
    return itemPrice;

}

}

C:\Java>java Inventory
Enter Department name: Electronics
Enter item name: camera
Enter the item number: 12345
Enter number of items on hand: 8
Enter item Price: 100.50
Department name:Electronics
Item number: 12345
Product name:camera
Quantity: 8
Price per unit100.5
Total value is:
$Exception in thread "main" java.util.MissingFormatArgumentException:
Format specifier '.2f'
at java.util.Formatter.format(Unknown Source)
at java.io.PrintStream.format(Unknown Source)
at java.io.PrintStream.printf(Unknown Source)
at Inventory.main(Inventory.java:82)

我似乎遇到了这个格式错误，但不明白为什么。

最佳答案

如果您使用 printf，您需要将占位符指定为 printf 参数以及格式字符串。在您的情况下，您通过附加金额来传递单个字符串，因此会出现错误。

System.out.printf("Total value is: $%.2f\n" + totalValue)

应该替换为

System.out.printf("Total value is: $%.2f\n", totalValue)

关于java - MissingFormatArgumentException 错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/7625233/