public class BankAccount {
    private final String accountNumber;
    private String ownerName;
    private double balance;
    public BankAccount (String accountNumber, String ownerName){
        this.accountNumber=accountNumber;
        this.ownerName=ownerName;
        this.balance=0.0;
    }
        public String getOwnerName() {
            return ownerName;
        }
        public void setOwnerName(String ownerName) {
            this.ownerName=ownerName;
        }
        public String getAccountNumber() {
            return accountNumber;
        }
        public double getBalance() {
            return balance;
        public void deposit(double amount) {
            if (amount > 0) {
                this.balance += amount;
                System.out.println("存款成功！当前余额：" + this.balance + " 元");
            } else {
                System.out.println("存款失败！存款金额必须大于0。");
            }
        }
        public void withdraw(double amount) {
            if (amount <= 0) {
                System.out.println("取款失败！取款金额必须大于0。");
            } else if (amount > this.balance) {
                System.out.println("取款失败！余额不足，当前余额：" + this.balance + " 元");
            } else {
                this.balance -= amount;
                System.out.println("取款成功！当前余额：" + this.balance + " 元");
            }
        }
    } 
}