我已经成功编译了我的库存程序:
//Inventory.java 第 1 部分//这个程序是计算电子部相机库存的价值导入 java.util.*;导入 javax.swing.*;导入 java.awt.event.*;导入java.io.*;公共类库存{公共静态无效主要(字符串 [] 参数){//创建扫描器以从命令窗口获取输入扫描仪输入 = 新扫描仪(System.in);字符串名称;int 项目编号;//第一个要相乘的数字int itemStock;//第二个要相乘的数字双项价格;//双倍总价值;//number1 和 number2 的乘积while(true){//无限循环//创建新的相机对象System.out.print("请输入部门名称:");//迅速的String itemDept = input.nextLine();//读取用户名if(itemDept.equals("stop"))//退出循环休息;{System.out.print("请输入项目名称:");//迅速的名称 = input.nextLine();//读取用户的第一个数字input.nextLine();}System.out.print("请输入商品编号:");//迅速的itemNumber = input.nextInt();//读取用户的第一个数字input.nextLine();而(项目编号 <= -1){System.out.print("请输入有效数字:");//迅速的itemNumber = input.nextInt();//从用户 input.nextLine() 中读取第一个数字;}/* while 语句,条件是输入负数提示用户输入正数 */System.out.print("输入手头的物品数量:");//迅速的itemStock = input.nextInt();//读取用户的第一个数字input.nextLine();而(项目库存 <= -1){System.out.print("输入正数的手头物品数:");//迅速的itemStock = input.nextInt();//读取用户的第一个数字input.nextLine();}/* while 语句,条件是输入负数提示用户输入正数 */System.out.print("输入商品价格:");//迅速的itemPrice = input.nextDouble();//从用户那里读取第二个数字input.nextLine();而(项目价格 <= -1){System.out.print("请输入商品价格的正数:");//迅速的itemPrice = input.nextDouble();//读取用户的第一个数字input.nextLine();}/* while 语句,条件是输入负数提示用户输入正数 */Cam camera = new Cam(name, itemNumber, itemStock, itemPrice);totalValue = itemStock * itemPrice;//乘数System.out.println("部门名称:" + itemDept);//显示部门名称System.out.println("物品编号:" + camera.getItemNumber());//显示商品编号System.out.println("产品名称:" + camera.getName());//显示项目System.out.println("数量:" + camera.getItemStock());System.out.println("单价" + camera.getItemPrice());System.out.printf("总值为:$%.2f
" + totalValue);//显示产品}//结束 while 方法}//结束方法 main}/* 结束类库存 */类凸轮{私有字符串名称;私人 int itemNumber;私有 int itemStock;私人双项价格;私人字符串部门名称;公共凸轮(字符串名称,int itemNumber,int itemStock,double itemPrice){this.name = 名称;this.itemNumber = itemNumber;this.itemStock = itemStock;this.itemPrice = itemPrice;}公共字符串 getName(){返回名称;}公共 int getItemNumber(){返回项目编号;}公共 int getItemStock(){返回项目库存;}公共双 getItemPrice(){返回项目价格;}}
<块引用>
C:Java>java 库存
输入部门名称:电子
输入项目名称:相机
输入货号:12345
输入手头的物品数量:8
输入商品价格:100.50
部门名称:电子学
货号:12345
产品名称:相机
数量:8
单价100.5
总值是:
线程主"java.util.MissingFormatArgumentException 中的 $Exception:
格式说明符.2f"
在 java.util.Formatter.format(未知来源)
在 java.io.PrintStream.format(未知来源)
在 java.io.PrintStream.printf(未知来源)
在 Inventory.main(Inventory.java:82)
我似乎遇到了这种格式错误,不明白为什么.
如果你使用printf
,你需要将占位符指定为<code>printf参数以及格式细绳.在您的情况下,您通过附加金额来传递单个字符串,因此会出现错误.
System.out.printf("总值为:$%.2f
" + totalValue)
应该替换为
System.out.printf("总值为:$%.2f
", totalValue)
I have been successful in compiling my inventory program:
// 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
" + 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)
I seem to come to this format error and cannot see why.
If you are using printf
, you need to specify the placeholders as printf
parameters along with the format string. In your case you are passing a single string by appending the amount hence the error.
System.out.printf("Total value is: $%.2f
" + totalValue)
should be replaced by
System.out.printf("Total value is: $%.2f
", totalValue)
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