我已成功编译我的库存程序：
// 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
输入部门名称：电子产品
输入商品名称：相机
输入商品编号：12345
输入库存数量：8
输入商品价格：100.50
部门名称：电子产品
商品编号：12345
商品名称：相机
数量：8
单价：100.5
总价值为：
$Exception in thread "main" java.util.MissingFormatArgumentException:
格式说明符'.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，但不知道原因。