添加一个功能，使BankAccount被用户选择suspend时，CurrentAccount不能进行存款和取款操作，并输出“该用户已经被挂起”反之可以进行，用Java来编写BankAccount和CurrentAccount，

好的，以下是BankAccount和CurrentAccount的Java代码，已经添加了挂起功能：

public class BankAccount {
    private double balance;
    private boolean suspended;

    public BankAccount() {
        this.balance = 0;
        this.suspended = false;
    }

    public void deposit(double amount) {
        if (!suspended) {
            balance += amount;
            System.out.println("Deposit successful. New balance: " + balance);
        } else {
            System.out.println("This account has been suspended. Deposit failed.");
        }
    }

    public void withdraw(double amount) {
        if (!suspended) {
            if (balance >= amount) {
                balance -= amount;
                System.out.println("Withdrawal successful. New balance: " + balance);
            } else {
                System.out.println("Insufficient funds. Withdrawal failed.");
            }
        } else {
            System.out.println("This account has been suspended. Withdrawal failed.");
        }
    }

    public void suspend() {
        suspended = true;
        System.out.println("This account has been suspended.");
    }

    public void unsuspend() {
        suspended = false;
        System.out.println("This account has been unsuspended.");
    }
}

public class CurrentAccount extends BankAccount {
    private double overdraftLimit;

    public CurrentAccount(double overdraftLimit) {
        super();
        this.overdraftLimit = overdraftLimit;
    }

    @Override
    public void withdraw(double amount) {
        if (!super.suspended) {
            if (super.balance + overdraftLimit >= amount) {
                super.balance -= amount;
                System.out.println("Withdrawal successful. New balance: " + super.balance);
            } else {
                System.out.println("Exceeded overdraft limit. Withdrawal failed.");
            }
        } else {
            System.out.println("This account has been suspended. Withdrawal failed.");
        }
    }
}

在BankAccount中添加了一个boolean变量suspended来表示账户是否被挂起。在deposit()和withdraw()方法中，如果账户被挂起，就输出错误信息并返回。在suspend()方法中，将suspended变量设置为true来挂起账户。在unsuspend()方法中，将suspended变量设置为false来解除挂起。

在CurrentAccount中重写了withdraw()方法，以便处理透支的情况。如果当前余额和透支额度大于等于取款金额，就可以取款；否则，就输出错误信息并返回。在withdraw()方法中也加入了对账户是否被挂起的判断。

希望这个代码可以帮助你实现所需的功能！