Java掃描器 - 爲什麼我會得到這個錯誤？

Question

我不是新來的java，但我不明白爲什麼我得到這個掃描儀錯誤。代碼編譯好，但我得到以下運行時錯誤

輸入項目編號：異常線程「main」 java.util.InputMismatchException 在java.util.Scanner.throwFor（Scanner.java:840） 是java .util.Scanner.next（Scanner.java:1461） at java.util.Scanner.nextInt（Scanner.java:2091） at java.util.Scanner.nextInt（Scanner.java:2050） at TestInvoice.getValues （TestInvoice.java:3

import java.util.Scanner; 


public class TestInvoice { 


    public static void main(String [] args) 
    { 
     /* create objects */ 
     Invoice item1 = new Invoice(); 
     Invoice item2 = new Invoice(); 
     Invoice item3 = new Invoice(); 

     /* get values */ 
     getValues(item1); 
     getValues(item2); 
     getValues(item3); 

     /* print objects */ 
     System.out.println(item1.toString() + "\n"); 
     System.out.println(item2.toString() + "\n"); 
     System.out.println(item3.toString() + "\n"); 


    } 

    private static void getValues(Invoice invoice) 
    {   
     int number; 
     String name; 
     int quantity; 
     double price; 

     /* get values from user */ 
     Scanner scanner = new Scanner("System.in"); 

     System.out.print("Enter item number: "); 
     number = scanner.nextInt(); 

     System.out.print("Enter item name: "); 
     name = scanner.next(); 

     System.out.print("Enter quantity: "); 
     quantity = scanner.nextInt(); 

     System.out.print("Enter item price: "); 
     price = scanner.nextDouble(); 

     System.out.println(); 

     /* set the values */ 
     invoice.setItemNumber(number); 
     invoice.setItemName(name); 
     invoice.setItemQuantity(quantity); 
     invoice.setItemPrice(price); 

    } 
} 

Answer 1

也許改變

Scanner scanner = new Scanner("System.in"); 

到

Scanner scanner = new Scanner(System.in);