數字格式例外，真正卡住

Question

hereis我的代碼....我得到一個NumberFormatException異常和IDK的whow解決吧..新手，完全卡住，真正需要幫助

public class AcccountArray { 

    public static void main(String[] args) 
    { 
     //Scan the file and save account details to array 
     File file = new File ("customers.txt"); 
     System.out.println("Path : " + file.getAbsolutePath()); 
     try{ 
        Scanner scanner = new Scanner("customers.txt"); 
        String[][] Account = new String[Integer.valueOf(scanner.nextLine())][3]; 

        for(int i=0;i<Account.length;i++) 
        { 
         Account[i][0]=scanner.nextLine(); 
         //System.out.println(Account[i][0]); 
         Account[i][1]=scanner.nextLine(); 
         //System.out.println(Account[i][1]); 
         Account[i][2]=scanner.nextLine(); 
         //System.out.println(Account[i][2]); 
        } 
        scanner.close(); 

錯誤：

java.lang.NumberFormatException: For input string: "customers.txt" 
    at java.lang.NumberFormatException.forInputString(Unknown Source) 
    at java.lang.Integer.parseInt(Unknown Source) 
    at java.lang.Integer.valueOf(Unknown Source) 
    at AcccountArray.main(AcccountArray.java:15) 

li。 15是

String[][] Account = new String[Integer.valueOf(scanner.nextLine())][3]; 

Answer 1

使用接受一個File所以Scanner構造掃描儀實例未使用String來源：

Scanner scanner = new Scanner(new File("customers.txt")); 

既然你已經有這樣的參考，您可以使用

Scanner scanner = new Scanner(file);