如何在java中仅在单个数组中打印多态对象

我对如何在数组中打印多态对象有问题，因为继承是适用的。我知道如何将其存储在单个数组中，但当要打印对象时，我完全被卡住了

这是我的主要课程：

public class AccountArray {

public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
    int n, i = 0;
    int numAcc;
    double balance, rate;

    Account[] bank = new Account[2];

    do {
        System.out.print("\n[1]Current || [2]Saving >> ");
        n = in.nextInt();
        System.out.println("------------");

        if (n == 1) {
            bank[i] = new Current();
            System.out.println("#Current#");
            System.out.println("------------");
            System.out.print("Please enter account number: ");
            numAcc = in.nextInt();
            bank[i].setAccountNumber(numAcc);
            System.out.print("Enter balance: ");
            balance = in.nextDouble();
            bank[i].setAccountBalance(balance);
            i++;
        } else if (n == 2) {
            bank[i] = new Saving();

            System.out.println("#Saving#");
            System.out.println("------------");
            System.out.print("Please enter account number: ");
            numAcc = in.nextInt();
            bank[i].setAccountNumber(numAcc);
            System.out.print("Enter balance: ");
            balance = in.nextDouble();
            bank[i].setAccountBalance(balance);
            System.out.print("Interest rate: ");
            rate = in.nextDouble();
            ((Saving) bank[i]).setInterest(rate);
            System.out.println("---------------------------------------");
            i++;
        }
    } while (i < bank.length);

    //Output
    System.out.println("### Data Output ###");
    for (int d = 0; d < bank.length; d++) {

        System.out.println("--------------------");
        System.out.println("Account Number: \t" + bank[d].getAccountNumber());
        System.out.println("Balance : \t" + bank[d].getAccountBalance());
        if (bank[d] == new Saving()) {
            System.out.println("Interest rate : " + ((Saving) bank[d]).getInterest());
        }
    }
}

这是储蓄班

public class Saving extends Account {

private double interest;

public Saving(int numAcc, double balance, double interest) {
    super(numAcc, balance);
    this.interest = interest;
}

public Saving() {

}

public void setInterest(double interest) {

    this.interest = interest;
}

public double getInterest() {

    return interest;
}

@Override
public void display() {
    System.out.println("Saving Account Information");
    System.out.println("account number: " + getAccountNumber());
    System.out.println("balance: RM " + getAccountBalance());
    System.out.println("interest: " + getInterest() + " %");
}
}

这是我目前的课程：

public class Current extends Account {

public Current(int accNum, double balance) {
    super(accNum, balance);
}

public Current() {

}

@Override
public void display() {
    System.out.println("Current Account Information");
    System.out.println("account number: " + getAccountNumber());
    System.out.println("balance: RM " + getAccountBalance());
}

}

---

另一种方法是重写每个对象的toString（）方法

bank[d]==new Saving（）

这是错误的，如果（bank[d]Saving实例）调用

display（）

方法并相信它是正确的。

bank[d]==new Saving（）

这是错误的，如果（bank[d]Saving实例）你尝试

如果（bank[d]Saving实例）

@realpoint它说，void方法无法使用。不要尝试打印它，只需调用它。谢谢大家，它使用@Palcente代码工作。

public class Current extends Account {

public Current(int accNum, double balance) {
    super(accNum, balance);
}

public Current() {

}

@Override
public void display() {
    System.out.println("Current Account Information");
    System.out.println("account number: " + getAccountNumber());
    System.out.println("balance: RM " + getAccountBalance());
}

}