寫入數據從對象數組文本文件的Java

Question

public class ReaderWriter extends Bank { 

private final String FILENAME = "clients.txt"; 

public void writeToFile() { 
    int i = 0; 
    boolean repeat = true; 
    Formatter output = null; // Used to write to file 

    try { 
     output = new Formatter(FILENAME); 
     // Open the file 

     while ((i <= accounts.length - 1) && (accounts[i] != null)) { 
      output.format("%s\n", accounts[i].getAccountHolder());  
      output.format("%d%n", accounts[i].getAccountNumber()); 
      output.format("%d%n", accounts[i].getAmount()); 
      i = i + 1; 
     }catch (Exception ex) { 

     ex.printStackTrace(); 
    } finally { 
     output.close();     // Make sure to close the resource after usage. 
    } 
} 

這是Bank類：

public class Bank { 

public final int MAX_NUMBER_OF_ACCOUNTS = 10; 
public int max = 0; 

String name1; 
int money1; 
int number1; 

Scanner input = new Scanner(System.in); 
BankAccount[] accounts = new BankAccount[MAX_NUMBER_OF_ACCOUNTS]; 
public void greateAccount() { 
    int i = 0; 
    boolean repeate2 = true; 
    System.out.println("You have chosen to create a new account."); 
    System.out.println("Enter the name of the account holder: "); 
    name1 = input.next(); 

    System.out.println("Enter the account no."); 
    number1 = input.nextInt(); 

    System.out.println("Enter the initiating amount: "); 
    money1 = input.nextInt(); 

    while (repeate2 == true) { 
     if (accounts[i] == null) { 
      if (i < 1) { 
       accounts[i] = new BankAccount(); 
       accounts[i].setAccountHolder(name1); 
       accounts[i].setAccountNumber(number1); 
       accounts[i].setAmount(money1); 
       repeate2 = false; 
      } else { 
       if (ifAccountExist(number1) != true) { 
        accounts[i] = new BankAccount(); 
        accounts[i].setAccountHolder(name1); 
        accounts[i].setAccountNumber(number1); 
        accounts[i].setAmount(money1); 
        repeate2 = false; 
       } else { 
        System.out.println("****This account ALREADY EXIST!****"); 
        System.out.println("*************************************"); 
        System.out.println(); 
        max = max - 1; 
        repeate2 = false; 
       } 
      } 
     } 
     i = i + 1; 
    } 
    max++; 
} 

現在我想要寫文本文件的帳號，姓名和金錢。 我的代碼不起作用。我不寫它無法從數組中檢索值我不知道爲什麼？ 你能幫我嗎？

Answer 1

的代碼不會編譯，原因是多方面的......

例如：

1. 爲什麼這一行：

   ex.printStackTrace（）;

   漂浮在您的類ReaderWriter（第21行）並帶走一個catch塊？

2. 爲什麼你沒有包括聲明？