打印重复数据集

Question

这是用于addnew帐户。

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Checkings类

储蓄：

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，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：我输入了帐户名称：John，帐户号：101，初始余额：500，帐户类型：储蓄。

它会喜欢这样的输出：

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

我找不到错在哪里。

Answer 1

在btnSaveAActionPerformed您致电list.add(account);然后检查帐户是否是支票或储蓄帐户。在if声明中，你做另一个list.add(account);

这导致帐户的双重增加。

Answer 2

**代码是问题的原因，因为您正在列表中添加两次帐户对象。

**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);** 
} 

更新你的代码是这样的：

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