Java/W3/BankAccount/BankAccount.java

public class BankAccount {
    // 私有属性
    private final String accountNumber;
    private String ownerName;
    private double balance;

    // 构造方法
    public BankAccount(String accountNumber, String ownerName) {
        this.accountNumber = accountNumber;
        this.ownerName = ownerName;
        this.balance = 0.0;
    }

    // 账户号 getter（无 setter）
    public String getAccountNumber() {
        return accountNumber;
    }

    // 户主姓名 getter 和 setter
    public String getOwnerName() {
        return ownerName;
    }

    public void setOwnerName(String ownerName) {
        this.ownerName = ownerName;
    }

    // 余额 getter（无直接 setter）
    public double getBalance() {
        return balance;
    }

    // 存款操作
    public void deposit(double amount) {
        if (amount > 0) {
            balance += amount;
            System.out.println("存款成功！当前余额：" + balance + " 元");
        } else {
            System.out.println("存款失败！存款金额必须大于0");
        }
    }

    // 取款操作
    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 > balance) {
            System.out.println("取款失败！余额不足，当前余额：" + balance + " 元");
        } else {
            balance -= amount;
            System.out.println("取款成功！当前余额：" + balance + " 元");
        }
    }
}