打印重复的数据集

Question

这是用于添加新帐户的。

private void btnSaveAActionPerformed(java.awt.event.ActionEvent evt)  
{                                         
    BankAccount account = new BankAccount();
    ButtonGroup bg = new ButtonGroup();
    bg.add(rad_savings);
    bg.add(rad_checking);

    account.setAccountName(txt_accountname.getText());
    account.setAccountNo(txt_accountnumber.getText());
    account.setBalance(Double.parseDouble(txt_initialbalance.getText()));

    list.add(account);


    if(rad_savings.isSelected()){
        //account = new SavingsAccount();
        account.setAccountType("Savings");
        list.add(account);
    }
    else
    { 
        //account = new CheckingAccount();
        account.setAccountType("Checking");
        list.add(account);
    }
}

我也有，储蓄和支票课

节省：

public class SavingsAccount extends BankAccount {

public SavingsAccount(){

};

public SavingsAccount(String accountNo, String accountName, double initBalance) {
    super(accountNo, accountName, initBalance);
}

public SavingsAccount(String accountNo, String accountName) {
    super(accountNo, accountName);
}
}

检查：

public class CheckingAccount extends BankAccount  {
private double overdraftProtection;


public CheckingAccount(){

};

public CheckingAccount(String accountNo, String accountName, 
        double initBalance) {
    super(accountNo, accountName, initBalance);
}

public CheckingAccount(String accountNo, String accountName) {
    super(accountNo, accountName);
}

public double getOverdraftProtection() {
    return overdraftProtection;
}

public void setOverdraftProtection(double overdraftProtection) {
    this.overdraftProtection = overdraftProtection;
}

public void withdraw(double amount) {
    // TODO: code for withdrawal
}

}

在我的 BankAccount 类中，我有这个：

public class BankAccount {
private String accountNo;
private String accountName;
protected double balance; 
private String accountType;

public String toString(){
    return "Account name: " +  accountName + "" + System.getProperty("line.separator") + 
        "Account Number: " + accountNo + "" +System.getProperty("line.separator")+ 
        "Balance: " + balance + "" + System.getProperty("line.separator")+ 
        "Account Type: " + accountType;

}

当我尝试它时，它会复制数据集： 例如：我输入了账户名：John，账户号：101，初始余额：500，账户类型：Savings。

会这样输出：

帐户名称：约翰 帐号：101 初始余额：500 账户类型：储蓄 帐户名称：约翰 帐号：101 初始余额：500 账户类型：储蓄

我找不到问题所在。

Answer 1

在btnSaveAActionPerformed 中调用list.add(account);，然后检查该帐户是支票帐户还是储蓄帐户。在这两个的if 语句中，您执行另一个list.add(account);

这导致帐户被双重添加。

Answer 2

**代码是您的问题的原因，因为您在列表中添加了两次帐户对象。

   **list.add(account);**

if(rad_savings.isSelected()){
    //account = new SavingsAccount();
    account.setAccountType("Savings");
    **list.add(account);**
}
else
{ 
    //account = new CheckingAccount();
    account.setAccountType("Checking");
    **list.add(account);**
}

像这样更新你的代码：

if(rad_savings.isSelected()){
    //account = new SavingsAccount();
    account.setAccountType("Savings");
}
else
{ 
    //account = new CheckingAccount();
    account.setAccountType("Checking");
}
list.add(account);